{"id":5408,"date":"2026-09-19T07:17:55","date_gmt":"2026-09-19T07:17:55","guid":{"rendered":"https:\/\/www.henghuahose.com\/?p=5408"},"modified":"2026-09-19T07:18:38","modified_gmt":"2026-09-19T07:18:38","slug":"hydraulic-hose-bend-radius-calculation-guide","status":"publish","type":"post","link":"https:\/\/www.henghuahose.com\/fr\/hydraulic-hose-bend-radius-calculation-guide\/","title":{"rendered":"Hydraulic Hose Bend Radius: How to Calculate &#038; Why It Matters"},"content":{"rendered":"<p><strong>Hydraulic hose bend radius is the smallest radius a hose can be bent to without kinking, collapsing its bore, or fatiguing the steel reinforcement that carries the pressure.<\/strong> Calculate it in three steps: read the minimum bend radius for your hose type and dash size from the data sheet, convert that radius into the hose length the bend will consume with L = (A \u00f7 360) \u00d7 2\u03c0r, then add a straight lead-in section at each fitting. For the size most drawings specify \u2014 a -8 (1\/2 inch) single-wire-braid hose to EN 853 1SN \u2014 the published minimum is 180 mm to the centreline, and 270 mm (1.5 \u00d7 the 180 mm static minimum) where the line flexes in service.<\/p>\n\n\n\n<p><strong>Note on terminology.<\/strong> In this guide, inner-surface radius (R1) is the radius measured to the innermost surface of the bend, and centreline radius (R2) is the radius measured to the hose centreline. Those are the two bend radius measurement conventions, and they have nothing to do with SAE 100R1 or SAE 100R2, which are hose construction designations. Every hose model here is written in full, and the construction comparison lives in our separate guide to SAE 100R1 versus SAE 100R2 hose construction.<\/p>\n\n\n\n<p>This guide gives you three things a bend radius chart alone cannot: published minimum bend radius values by dash size for EN 853 1SN and EN 856 4SP hose, the calculation that converts a radius into the hose length a bend consumes, and the field methods \u2014 template, chord and sagitta, arc length \u2014 that measure the radius of a hose already installed. It also shows why a bend built 30 percent tighter than the data sheet value costs hose life far more than most maintenance teams expect.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"table-of-contents\">Table of Contents<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#what-is-hydraulic-hose-bend-radius\">What Is Bend Radius?<\/a><\/li>\n\n\n\n<li><a href=\"#why-bend-radius-matters-four-consequences-you-can-measure\">Why Bend Radius Matters: Four Consequences You Can Measure<\/a><\/li>\n\n\n\n<li><a href=\"#hydraulic-hose-bend-radius-chart-by-dash-size\">Bend Radius Chart by Dash Size<\/a><\/li>\n\n\n\n<li><a href=\"#how-do-you-calculate-hydraulic-hose-bend-radius\">How Do You Calculate Bend Radius?<\/a><\/li>\n\n\n\n<li><a href=\"#how-do-you-measure-bend-radius-on-an-installed-hose\">How Do You Measure Bend Radius on an Installed Hose?<\/a><\/li>\n\n\n\n<li><a href=\"#which-bend-radius-applies-static-vs-dynamic\">Which Bend Radius Applies: Static vs Dynamic?<\/a><\/li>\n\n\n\n<li><a href=\"#what-does-an-over-tight-bend-look-like-on-a-returned-hose\">What Does an Over-Tight Bend Look Like?<\/a><\/li>\n\n\n\n<li><a href=\"#how-do-you-route-a-hose-so-it-stays-inside-its-bend-radius\">How Do You Route a Hose Inside Its Bend Radius?<\/a><\/li>\n\n\n\n<li><a href=\"#faq\">Foire aux questions<\/a><\/li>\n\n\n\n<li><a href=\"#final-verdict-calculate-once-route-correctly-stop-replacing-hoses\">Final Verdict: Calculate Once, Route Correctly, Stop Replacing Hoses<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-hydraulic-hose-bend-radius\">What Is Hydraulic Hose Bend Radius?<\/h2>\n\n\n\n<p>Hydraulic hose bend radius is a curvature limit, not a cosmetic preference. It is the radius of the arc a hose forms when it is bent to its safe limit, and it is the point beyond which the inner tube deforms, the wire braid or spiral layers start pulling unevenly, and the bore begins to flatten.<\/p>\n\n\n\n<p>Two measurement conventions exist, and mixing them up is the most common source of installation errors. The NAHAD Hose Safety Institute Handbook for the Design and Specification of Hose Assemblies defines bend radius as the distance to the innermost surface of the curved section \u2014 the inner-surface radius (R1) \u2014 and notes that some manufacturers instead measure to the hose centreline \u2014 the centreline radius (R2). The gap between the two is exactly half the hose outside diameter: 10.5 mm on a -8 single-wire-braid hose whose outside diameter is 21.0 mm. That is small in a diagram and very large in a warranty argument.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-centerline-vs-inside-radius.jpg\" alt=\"Diagram comparing the centreline radius (R2) with the inner-surface radius (R1) on a bent hydraulic hose, showing the offset equal to half the hose outside diameter\" class=\"wp-image-5366\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-centerline-vs-inside-radius.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-centerline-vs-inside-radius-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-centerline-vs-inside-radius-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-centerline-vs-inside-radius-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-centerline-vs-inside-radius-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 1. Centreline radius (R2) and inner-surface radius (R1) differ by half the hose OD \u2014 the reason a data sheet value must always be read together with its measurement convention.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"bend-radius-vs-bend-diameter\">Bend Radius vs Bend Diameter<\/h3>\n\n\n\n<p>Bend diameter is twice the bend radius, and the two terms are used interchangeably in workshop conversation. That habit causes errors when someone measures the full width of a 180-degree loop and compares it against a radius figure.<\/p>\n\n\n\n<p>Bend radius, bend diameter, and the two measurement conventions: definitions, formulas, and the convention to use (definitions per the NAHAD handbook; the formulas are plain geometry)<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Term<\/th><th scope=\"col\">What it measures<\/th><th scope=\"col\">Formula<\/th><th scope=\"col\">Convention to use<\/th><\/tr><\/thead><tbody><tr><td>Bend radius<\/td><td>Radius of the arc the hose follows when it is bent to its safe limit; the NAHAD definition measures it to the innermost surface of the bend<\/td><td>r<\/td><td>Publish and compare one convention at a time<\/td><\/tr><tr><td>Bend diameter<\/td><td>Full diameter of the circle the hose follows<\/td><td>D = 2 \u00d7 r<\/td><td>Twice the bend radius, never an interchangeable figure<\/td><\/tr><tr><td>Inner-surface radius (R1)<\/td><td>Radius measured to the innermost surface of the bend \u2014 the NAHAD basis<\/td><td>centreline radius (R2) \u2212 OD \u00f7 2<\/td><td>State it as &#8220;inside&#8221; so it is not read as a centreline figure<\/td><\/tr><tr><td>Centreline radius (R2)<\/td><td>Radius measured to the hose centreline \u2014 what most catalogues print<\/td><td>inner-surface radius (R1) + OD \u00f7 2<\/td><td>State it as &#8220;centreline&#8221; on every drawing and inquiry<\/td><\/tr><tr><td>Arc length of the bend<\/td><td>Hose length consumed by the curve<\/td><td>L = (A \u00f7 360) \u00d7 2\u03c0r<\/td><td>Add one straight lead-in at each end before cutting<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"static-and-dynamic-bend-radius-are-not-the-same-number\">Static and Dynamic Bend Radius Are Not the Same Number<\/h3>\n\n\n\n<p>A <strong>static bend radius<\/strong> applies where the hose is bent into a fixed position and does not flex in service \u2014 a chassis line, a fixed plant run. A <strong>dynamic bend radius<\/strong> applies where the hose bends or flexes continuously, such as a cylinder line on a boom. The dynamic figure manufacturers publish is commonly 1.5 times the static figure \u2014 industry practice, not a fixed standard requirement \u2014 because wire reinforcement fatigues under repeated bending. On the -8 single-wire-braid example that means 270 mm (1.5 \u00d7 the 180 mm static minimum) where the line moves.<\/p>\n\n\n\n<p>If a data sheet lists only one value and the hose will move at all, treat that single value as static and apply the dynamic allowance yourself. This single adjustment prevents more premature failures than any other routing decision.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-bend-radius-matters-four-consequences-you-can-measure\">Why Bend Radius Matters: Four Consequences You Can Measure<\/h2>\n\n\n\n<p>Exceeding the hydraulic hose bend radius does not usually cause an immediate failure. It causes four slower, measurable losses that show up as heat, downtime, and repeat replacements.<\/p>\n\n\n\n<p><strong>1. Flow restriction and heat.<\/strong> A bend adds pressure loss, and a bend that flattens the bore adds far more. In standard fluid-mechanics tables a generous 90-degree elbow in a smooth bore carries a loss coefficient of about 0.3; a bend tight enough to deform the bore raises that figure several-fold. The loss converts directly into heat, and heat is what ages hydraulic fluid and rubber.<\/p>\n\n\n\n<p><strong>2. Reinforcement fatigue.<\/strong> Wire braid and spiral layers are designed to work at a near-constant strain. When a hose sits below its bend limit, the outer wires run under permanent tension and the inner wires under compression, so every pressure cycle is a harder cycle. Impulse testing to EN ISO 6803 runs at 133 percent of rated working pressure at +100 \u00b0C and requires at least 200,000 cycles on a correctly bent sample. A hose bent below its limit spends that margin faster, and the boundary between rated and failing pressure that the test is built around is set out in our guide to working pressure versus burst pressure.<\/p>\n\n\n\n<p><strong>3. Hose length you did not account for.<\/strong> A bend consumes hose length. A 90-degree bend in a -8 single-wire-braid hose with a 180 mm centreline radius uses 283 mm of hose \u2014 a quarter of the circle, from (90 \u00f7 360) \u00d7 2\u03c0 \u00d7 180 \u2014 so an assembly cut to the port-to-port distance has no room left for the curve, and the installer has to force the bend tighter than its 180 mm minimum. Allow the arc length of every bend plus one straight lead-in at each fitting in the cut length, and the routing matches the drawing instead of fighting it.<\/p>\n\n\n\n<p><strong>4. Kinking, burst, and downtime.<\/strong> At some point past the limit the bore collapses into a kink: flow drops sharply, the tube is damaged at the fold, and the assembly is finished. If the hose is pressurized when the kink tears, the release of stored energy is a genuine safety event, and hydraulic fluid under pressure can penetrate skin. Fluid injection injuries are treated as surgical emergencies, so never run a hand along a pressurized hose to find a leak \u2014 use a piece of cardboard or a leak-detection dye instead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"hydraulic-hose-bend-radius-chart-by-dash-size\">Hydraulic Hose Bend Radius Chart by Dash Size<\/h2>\n\n\n\n<p>The authoritative source is always the data sheet for the specific hose you are buying. A bend radius chart gives you the starting number for your hose family, and the two tables below show published values for the families that cover most hydraulic work, so you can sanity-check a data sheet or an existing installation.<\/p>\n\n\n\n<p>Published minimum bend radius and working pressure for EN 853 1SN single-wire-braid hose (the European equivalent of SAE 100R1 \u2014 an equivalent construction, not necessarily identical published values), by dash size; confirm the measurement convention and the static or dynamic basis on your own data sheet<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Taille des tirets<\/th><th scope=\"col\">Nominal ID<\/th><th scope=\"col\">Working pressure (MPa \/ psi)<\/th><th scope=\"col\">Min bend radius (mm)<\/th><th scope=\"col\">Min bend radius (in)<\/th><th scope=\"col\">Radius \u00f7 ID<\/th><\/tr><\/thead><tbody><tr><td>-4<\/td><td>1\/4 in (6.4 mm)<\/td><td>22.5 \/ 3,260<\/td><td>100<\/td><td>3.9<\/td><td>15.6\u00d7<\/td><\/tr><tr><td>-6<\/td><td>3\/8 in (9.5 mm)<\/td><td>18 \/ 2,610<\/td><td>130<\/td><td>5.1<\/td><td>13.7\u00d7<\/td><\/tr><tr><td>-8<\/td><td>1\/2 in (12.7 mm)<\/td><td>16 \/ 2,320<\/td><td>180<\/td><td>7.1<\/td><td>14.2\u00d7<\/td><\/tr><tr><td>-10<\/td><td>5\/8 in (15.9 mm)<\/td><td>13 \/ 1,885<\/td><td>200<\/td><td>7.9<\/td><td>12.6\u00d7<\/td><\/tr><tr><td>-12<\/td><td>3\/4 in (19.0 mm)<\/td><td>10.5 \/ 1,520<\/td><td>240<\/td><td>9.4<\/td><td>12.6\u00d7<\/td><\/tr><tr><td>-16<\/td><td>1 in (25.4 mm)<\/td><td>8.8 \/ 1,280<\/td><td>300<\/td><td>11.8<\/td><td>11.8\u00d7<\/td><\/tr><tr><td>-20<\/td><td>1 1\/4 in (31.8 mm)<\/td><td>6.3 \/ 910<\/td><td>420<\/td><td>16.5<\/td><td>13.2\u00d7<\/td><\/tr><tr><td>-24<\/td><td>1 1\/2 in (38.1 mm)<\/td><td>5 \/ 725<\/td><td>500<\/td><td>19.7<\/td><td>13.1\u00d7<\/td><\/tr><tr><td>-32<\/td><td>2 in (50.8 mm)<\/td><td>4 \/ 580<\/td><td>630<\/td><td>24.8<\/td><td>12.4\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Read the last column before you trust any rule of thumb.<\/p>\n\n\n\n<p>If the pressure class is what you are choosing around, the decision order between one-wire, two-wire, and compact constructions at the same dash size is set out in our guide to the three-way comparison of SAE 100R1, SAE 100R2 and SAE 100R16. For steel-reinforced braided hose the published value lands between roughly 12 and 16 times the nominal bore. The &#8220;multiply the outside diameter by 6&#8221; shortcut is widely repeated, and it understates the requirement: on this -8 hose, whose single-braid outside diameter is 21.0 mm, the shortcut returns 6 \u00d7 21.0 = 126 mm, while the data sheet requires 180 mm to the centreline. That is a 30 percent underestimate (1 \u2212 126 \u00f7 180 = 0.30), and it is exactly the margin that turns a compliant-looking installation into a failure.<\/p>\n\n\n\n<p>Higher-pressure spiral hose is stiffer again, which is the trade-off you accept for the extra pressure capacity. Do not read the EN 853 1SN table and the EN 856 4SP table as a comparison: at -6 the single-braid figure is 130 mm and the four-spiral figure is 180 mm, and that gap is the construction, not a correction.<\/p>\n\n\n\n<p>Published limits and working pressure (bar) for EN 856 4SP four-spiral hose, by dash size \u2014 a different construction from the EN 853 1SN table (previous table), so the two tables are not directly comparable; dash sizes run from -6 to -32, and the -4 size of this construction is not published in the source table used here. 1 bar = 14.5 psi \/ 0.1 MPa. Confirm the coverage, the measurement convention, and the static or dynamic basis on your own data sheet<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Taille des tirets<\/th><th scope=\"col\">Nominal ID<\/th><th scope=\"col\">Working pressure (bar)<\/th><th scope=\"col\">Min bend radius (mm)<\/th><th scope=\"col\">Min bend radius (in)<\/th><th scope=\"col\">Radius \u00f7 ID<\/th><\/tr><\/thead><tbody><tr><td>-6<\/td><td>3\/8 in<\/td><td>445 bar<\/td><td>180<\/td><td>7.1<\/td><td>18.9\u00d7<\/td><\/tr><tr><td>-8<\/td><td>1\/2 in<\/td><td>425 bar<\/td><td>230<\/td><td>9.1<\/td><td>18.1\u00d7<\/td><\/tr><tr><td>-12<\/td><td>3\/4 in<\/td><td>350 bar<\/td><td>300<\/td><td>11.8<\/td><td>15.8\u00d7<\/td><\/tr><tr><td>-16<\/td><td>1 in<\/td><td>320 bar<\/td><td>340<\/td><td>13.4<\/td><td>13.4\u00d7<\/td><\/tr><tr><td>-20<\/td><td>1 1\/4 in<\/td><td>210 bar<\/td><td>460<\/td><td>18.1<\/td><td>14.5\u00d7<\/td><\/tr><tr><td>-24<\/td><td>1 1\/2 in<\/td><td>185 bar<\/td><td>560<\/td><td>22.0<\/td><td>14.7\u00d7<\/td><\/tr><tr><td>-32<\/td><td>2 in<\/td><td>165 bar<\/td><td>660<\/td><td>26.0<\/td><td>13.0\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Where space is genuinely tight, the engineering answer is usually a compact construction rather than a forced bend. A compact two-wire hose to EN 857 2SC \u2014 the construction published as SAE 100R16 \u2014 carries a comparable pressure class in a tighter package: at -8 it publishes a 130 mm minimum bend radius where the standard single-braid -8 needs 180 mm, a 28 percent reduction. That difference often decides whether a hose can be routed inside a guard instead of outside it. If the envelope is the constraint, send us the available space, the working pressure, and the stroke the hose has to cover, and our engineers will confirm which construction reaches the bend radius your routing needs.<\/p>\n\n\n\n<p>Two habits make a chart easier to use, and both are about keeping the comparison honest.<\/p>\n\n\n\n<p>First, never compare bend radius values across standard families. An EN 853 figure and a compact EN 857 or SAE 100R16 figure describe different constructions, so a specification built from both cannot be met by any single hose. Two-wire hose is published under more than one standard as well: EN 853 2SN and SAE J517 100R2AT are separate families with different working pressures for the same dash size, so name the standard on the drawing before you compare any two-wire figure. The standard-by-standard comparison is in our <a href=\"https:\/\/www.henghuahose.com\/fr\/hydraulic-hose-standards-selection-guide\/\" target=\"_blank\" rel=\"noopener\">guidance on SAE, ISO and DIN hose standards<\/a>.<\/p>\n\n\n\n<p>Second, a tighter published radius comes from a different reinforcement construction, not from a softer compound \u2014 it is a trade, not a free upgrade. The end fittings belong in the same review: the hydraulic hose fittings guide covers how the seat and the nut of an end fitting fix the straight length you still need to leave at each end of the assembly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-do-you-calculate-hydraulic-hose-bend-radius\">How Do You Calculate Hydraulic Hose Bend Radius?<\/h2>\n\n\n\n<p>There are three legitimate methods, and they answer different questions. Use method one to specify, method two to estimate before you have a data sheet, and method three to verify what is actually installed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"method-1-read-the-data-sheet-authoritative\">Method 1: Read the Data Sheet (Authoritative)<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Identify the hose type in full \u2014 for example EN 853 1SN, SAE 100R2AT to EN 853 2SN, or EN 856 4SP.<\/li>\n<li>Find the dash size or nominal bore on the layline or in the drawing.<\/li>\n<li>Read the published limit for that exact type and size.<\/li>\n<li>Confirm two things on the same data sheet: whether the value is published as a centreline radius (R2) or as an inner-surface radius (R1), and whether it is static or dynamic.<\/li>\n<\/ol>\n\n\n\n<p><strong>How to decide when the data sheet is silent<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>One number only: treat it as the static value, and add the dynamic allowance (1.5\u00d7) for any hose that moves.<\/li>\n<li>One number only: assume it is measured to the centreline unless the sheet says &#8220;inside&#8221; or prints a bend-diameter figure \u2014 the two conventions differ by half the outside diameter, 10.5 mm on this -8 hose.<\/li>\n<li>The sheet gives a bend diameter: divide by two before comparing it with a radius figure.<\/li>\n<li>The sheet is silent on both: record the assumption on the drawing and ask the supplier to confirm it in writing, because that one line decides whether the assembly passes inspection.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"method-2-estimate-from-the-bore-early-sizing-only\">Method 2: Estimate From the Bore (Early Sizing Only)<\/h3>\n\n\n\n<p>When no data sheet is available yet, estimate the value as 12 to 16 times the nominal bore for single-wire-braid hose, and 13 to 19 times the bore for four-spiral hose. For a -8 braided hose, 12 \u00d7 12.7 mm = 152 mm as a floor and 16 \u00d7 12.7 mm = 203 mm as a ceiling, which brackets the published 180 mm.<\/p>\n\n\n\n<p>Then replace the estimate with the real figure before the drawing is released. An estimate is a placeholder, never a specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"method-3-what-length-does-the-bend-consume\">Method 3: What Length Does the Bend Consume?<\/h3>\n\n\n\n<p>The arc formula converts a radius into the hose length that the curve will use:<\/p>\n\n\n\n<p><strong>L = (A \u00f7 360) \u00d7 2\u03c0r<\/strong><\/p>\n\n\n\n<p>where L is arc length, A is the bend angle in degrees, and r is the bend radius. Worked example for the -8 single-wire-braid hose with its published 180 mm centreline radius:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>90-degree bend: L = (90 \u00f7 360) \u00d7 2\u03c0 \u00d7 180 = <strong>283 mm (11.1 in)<\/strong> of hose consumed by the curve.<\/li>\n\n\n\n<li>45-degree bend: L = (45 \u00f7 360) \u00d7 2\u03c0 \u00d7 180 = <strong>141 mm (5.6 in)<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Now add the straight lead-in. Best practice keeps a short straight section between the crimped fitting and the start of the bend \u2014 roughly one hose outside diameter, which is 21.0 mm at each end on this -8 hose. The minimum routed length for a single 90-degree bend is therefore about 283 + 42 = <strong>325 mm (12.8 in)<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-straight-leadin-fitting.jpg\" alt=\"Comparison diagram showing a correct hydraulic hose routing with a straight lead-in section after the crimped fitting, next to an incorrect routing where the bend starts immediately at the fitting\" class=\"wp-image-5367\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-straight-leadin-fitting.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-straight-leadin-fitting-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-straight-leadin-fitting-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-straight-leadin-fitting-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-straight-leadin-fitting-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 2. Correct versus incorrect lead-in: keeping a straight section of about one hose outside diameter (21.0 mm on a -8 hose) prevents the bend from loading the crimped fitting.<\/p>\n\n\n\n<p>This is the number that matters on the shop floor. Assemblies fail at the fitting far more often than in the middle because there was no straight lead-in and the bend began inside the crimp.<\/p>\n\n\n\n<p>A bend radius calculator is a check, not an authority: it applies L = (A \u00f7 360) \u00d7 2\u03c0r correctly, but it cannot tell you whether the supplier&#8217;s catalogue measured the radius to the centreline or to the inside surface, it cannot tell you whether the hose is static or dynamic in service, and it will happily accept a value that is already below the hose&#8217;s published minimum for that type and dash size. Start from the data sheet, then use a bend radius calculator to verify a layout on site.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-do-you-measure-bend-radius-on-an-installed-hose\">How Do You Measure Bend Radius on an Installed Hose?<\/h2>\n\n\n\n<p>Measurement confirms whether the routing you built matches the limit you specified. Use a template when you can judge by eye, and use geometry when you need a number.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-you-check-bend-radius-with-a-template\">How Do You Check Bend Radius With a Template?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Cut a disc, or find a round object, whose radius equals the bend radius you are checking.<\/li>\n<li>Place it inside the curve of the installed hose, against the inside surface of the bend.<\/li>\n<li>Compare: if the hose arc is equal to or flatter than the template, the installation is compliant; if the hose curve is tighter than the template, it is not.<\/li>\n<\/ol>\n\n\n\n<p>This method takes seconds and needs no arithmetic, and it is the standard check used during installation and again after pressurization. Where the hose is too large for a template, measure the centreline bend radius from the geometry below instead.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-you-measure-the-radius-of-an-installed-hose-with-a-chord-and-a-sagitta\">How Do You Measure the Radius of an Installed Hose With a Chord and a Sagitta?<\/h3>\n\n\n\n<p>Measure the chord \u2014 the straight-line distance across the bend \u2014 and the sagitta, the depth of the curve from that chord. The radius follows from geometry alone:<\/p>\n\n\n\n<p><strong>r = (c\u00b2 \u00f7 8s) + (s \u00f7 2)<\/strong><\/p>\n\n\n\n<p>For a bend with a 200 mm chord and a 25 mm sagitta: r = (40,000 \u00f7 200) + 12.5 = <strong>212.5 mm<\/strong>. That 212.5 mm is measured to the centreline, so compare it against the printed minimum bend radius for the hose type and dash size only after confirming which convention that printed value uses. Against the -8 single-braid minimum of 180 mm, this example passes with 32.5 mm to spare.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-chord-sagitta-measurement.jpg\" alt=\"Diagram of the chord and sagitta method for measuring installed hydraulic hose bend radius, showing chord length c, sagitta depth s, and the resulting radius formula\" class=\"wp-image-5368\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-chord-sagitta-measurement.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-chord-sagitta-measurement-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-chord-sagitta-measurement-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-chord-sagitta-measurement-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/hydraulic-hose-bend-radius-chord-sagitta-measurement-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 3. Chord and sagitta method: r = (c\u00b2 \u00f7 8s) + (s \u00f7 2) turns two tape measurements into an installed centreline bend radius.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-you-get-a-radius-from-a-measured-arc-length\">How Do You Get a Radius From a Measured Arc Length?<\/h3>\n\n\n\n<p>Where you can measure the length of hose along the curve and the angle of the bend, work backwards with r = 360L \u00f7 (2\u03c0A). A measured 300 mm of arc across a 90-degree bend gives r = 108,000 \u00f7 565.5 = <strong>191 mm<\/strong>. This works well on large assemblies where a template is impractical, and it returns the centreline bend radius directly, with no template or gauge needed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"when-should-you-re-measure-bend-radius-after-installation\">When Should You Re-Measure Bend Radius After Installation?<\/h3>\n\n\n\n<p>Measure once as installed, again at full working pressure, and once after a heat cycle. Hoses that expand under pressure, hoses in hot compartments, and hoses bundled with clamp spacing that is too wide all settle into a different shape than the one you checked cold and unpressurized. Treat the pressure reading as the binding one, because that is the shape the reinforcement lives with in service \u2014 and it is the one reading a bend radius calculator will never take for you.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"which-bend-radius-applies-static-vs-dynamic\">Which Bend Radius Applies: Static vs Dynamic?<\/h2>\n\n\n\n<p>Specify every moving hydraulic hose to its dynamic minimum bend radius \u2014 the value that holds when the hose flexes repeatedly, at full pressure and at operating temperature. Four adjustments move the static data sheet figure into the real world.<\/p>\n\n\n\n<p>Adjustments to apply to a static bend radius in service conditions; the multipliers in rows 1 and 2 are industry practice, not a fixed standard requirement, and rows 3 and 4 are risk treatments rather than values<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Service condition<\/th><th scope=\"col\">Adjustment (\u00d7)<\/th><th scope=\"col\">What to do if it cannot be avoided<\/th><th scope=\"col\">Reason<\/th><\/tr><\/thead><tbody><tr><td>Continuous or repeated flexing<\/td><td>1.5\u00d7<\/td><td>Route to the dynamic figure the data sheet publishes<\/td><td>Wire reinforcement fatigues under repeated bending<\/td><\/tr><tr><td>Operating below 0 \u00b0C \/ 32 \u00b0F<\/td><td>1.3\u00d7<\/td><td>Keep the line in a warm compartment, or pre-heat the machine before the first start<\/td><td>Rubber compounds stiffen as they cool<\/td><\/tr><tr><td>Severe pressure pulsation or shock<\/td><td>\u2014 (no multiplier)<\/td><td>Verify the pressure rating and add margin on the drawing<\/td><td>Each cycle strains the outer wires of the bend<\/td><\/tr><tr><td>Abrasion against a hard edge<\/td><td>\u2014 (no multiplier)<\/td><td>Increase the radius or add a guard<\/td><td>A tight bend presses the cover into the contact point<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The published dynamic bend radius is the safest single number to design with, because it already assumes movement. Where a supplier publishes only one figure, apply the 1.5\u00d7 allowance for any hose that will move, add the 1.3\u00d7 cold allowance where the machine starts below 0 \u00b0C (32 \u00b0F) \u2014 the -8 example then needs 234 mm rather than 180 mm \u2014 and use that number as the working limit on the drawing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"which-bend-radius-should-you-specify-a-table-for-five-situations\">Which Bend Radius Should You Specify? A Table for Five Situations<\/h3>\n\n\n\n<p>Bend radius by situation: the figure to specify and the first action to take (figures are the published values from the tables above, with the allowances noted there)<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Your situation<\/th><th scope=\"col\">Bend radius to specify<\/th><th scope=\"col\">First action<\/th><\/tr><\/thead><tbody><tr><td>You are specifying a new assembly for a drawing<\/td><td>The dynamic value, plus the cold-weather allowance if the machine runs below 0 \u00b0C<\/td><td>Read the data sheet for the exact type and dash size, and note whether it is an inner-surface radius (R1) or a centreline radius (R2)<\/td><\/tr><tr><td>You are repairing a failed line on a machine<\/td><td>The dynamic value \u2014 the figure printed on the old line is usually the static one<\/td><td>Measure the installed radius by chord and sagitta before you cut the replacement<\/td><\/tr><tr><td>You are fitting a hose into an existing envelope<\/td><td>The tightest value the construction allows, then re-measure at full pressure<\/td><td>Compare a compact two-wire construction against the standard hose at the same dash size<\/td><\/tr><tr><td>You are quoting or stocking a tight-space line<\/td><td>The compact construction at the same dash size, published as EN 857 2SC (SAE 100R16)<\/td><td>Compare the compact and standard figures at that dash size, and ask the supplier which convention and which static or dynamic basis the quoted number uses<\/td><\/tr><tr><td>The same corner keeps failing on the same machine<\/td><td>The tighter of the two constructions the envelope allows<\/td><td>Work the failure-signature table below from the damage you can see, then re-route rather than re-order the same part<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-does-an-over-tight-bend-look-like-on-a-returned-hose\">What Does an Over-Tight Bend Look Like on a Returned Hose?<\/h2>\n\n\n\n<p>Exceeding the hydraulic hose bend radius leaves a recognizable signature, and reading that signature is what separates a diagnosis from a replacement. When our team cuts open returned assemblies, the damage pattern almost always identifies the routing error before the hose reaches the test bench. The table works in both directions: read it from the damage you can see, and use the re-measure target as the acceptance check on the replacement line.<\/p>\n\n\n\n<p>Failure signatures that point to an over-tight bend, with the field correction and the re-measure target for the replacement line<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">What you see<\/th><th scope=\"col\">What it usually means<\/th><th scope=\"col\">Field correction<\/th><th scope=\"col\">Re-measure target (what to measure and the value)<\/th><\/tr><\/thead><tbody><tr><td>Broken or frayed wire strands on the outside of the bend<\/td><td>The outer reinforcement has been running under permanent tension \u2014 the hose is installed below its bend limit<\/td><td>Re-route to the published minimum for that type and dash size<\/td><td>Centreline radius \u2265 180 mm on a -8 single-braid hose<\/td><\/tr><tr><td>Flattened or pinched cross-section, or a fold in the hose<\/td><td>The bend is tighter than the limit, or the bend starts immediately at the fitting<\/td><td>Re-cut with the arc length of the bend plus a straight lead-in at each fitting<\/td><td>Straight length before the first bend: \u2265 21.0 mm (one outside diameter)<\/td><\/tr><tr><td>Cover cracking concentrated in the curve<\/td><td>Repeated flexing below the dynamic limit, accelerated by heat or ozone<\/td><td>Move to the dynamic value, or to a more compact construction<\/td><td>Centreline radius \u2265 270 mm on a -8 hose that flexes<\/td><\/tr><tr><td>Leak or pull-off at the crimp<\/td><td>Side load from a forced bend, where the assembly is used to pull two ports into alignment<\/td><td>Align the ports with brackets, then cut the hose to the new centre distance<\/td><td>Side load at the crimp: none, with the radius re-verified at full pressure<\/td><\/tr><tr><td>Blistered or separated cover near the bend<\/td><td>Heat build-up in a restricted, tight curve, or chafing against a hard edge<\/td><td>Increase the radius or add a spiral guard at the contact point<\/td><td>Cover at the contact point: intact after a full heat cycle<\/td><\/tr><tr><td>Local seepage with no external damage<\/td><td>Tube damage from kinking \u2014 the reinforcement looks intact while the inner tube is already cracked<\/td><td>Replace the assembly and correct the routing, not just the hose<\/td><td>Pressure and radius: full working pressure held, radius measured cold and again hot<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-inspect-a-returned-assembly-our-workshop-procedure\">How to Inspect a Returned Assembly (Our Workshop Procedure)<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Photograph the assembly as received, with the failure point and the layline visible in the same frame.<\/li>\n<li>Cut the cover back at the bend only \u2014 never along the straight run \u2014 so the wire pattern stays intact for the photo.<\/li>\n<li>Measure the installed bend radius on the machine before the replacement is cut, using the chord and sagitta method above.<\/li>\n<li>Open the crimp and check the ferrule for side load before the hose is scrapped.<\/li>\n<li>Record the dash size, the date code, and the measured radius against the data-sheet limit in one line.<\/li>\n<\/ol>\n\n\n\n<p>Counts by failure mode will be published once the workshop reporting sheet has a full quarter of data.<\/p>\n\n\n\n<p>A kinked hydraulic hose is the most expensive failure mode because it can pass a visual inspection: the cover looks smooth and the assembly holds pressure at idle, yet the inner tube is already cracked and the line fails weeks later under a pressure spike.<\/p>\n\n\n\n<p>Where the same corner keeps failing without ever reaching a kink, the better answer is usually compact routing design rather than a stiffer hose. This page covers the calculation and the field measurement; the companion guide explains <a href=\"https:\/\/www.henghuahose.com\/fr\/hydraulic-hose-bend-radius-how-smaller-bends-improve-flow-and-machine-life\/\" target=\"_blank\" rel=\"noopener\">how compact routing design improves flow and machine life<\/a> from the compact-routing design side \u2014 read both before you fix a routing envelope. Where the tight radius is produced by a tolerance stack-up at the port rather than by the hose, check the bore first against the dash-to-ID-and-OD conversion table in our hydraulic hose size chart guide.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-do-you-route-a-hose-so-it-stays-inside-its-bend-radius\">How Do You Route a Hose So It Stays Inside Its Bend Radius?<\/h2>\n\n\n\n<p>The calculation protects you only if the installation respects it. These rules cover the failures we see most often.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Keep a straight lead-in at every fitting.<\/strong> Leave roughly one hose outside diameter \u2014 21.0 mm on a -8 hose \u2014 of straight hose before the bend begins, so the bend never starts inside the crimp.<\/li>\n\n\n\n<li><strong>Keep one bend plane per hose.<\/strong> Twisting a hose while forcing a bend combines torsion with curvature, and torsion is the faster killer of the two. Align the printed layline straight along the run and check it again after tightening.<\/li>\n\n\n\n<li><strong>Use fittings instead of tighter bends.<\/strong> A 45-degree or 90-degree elbow, a bent-tube fitting, or a banjo adapter buys angle without loading the hose. A <a href=\"https:\/\/www.henghuahose.com\/fr\/product-category\/hydraulic-hose\/\" target=\"_blank\" rel=\"noopener\">standard hose assembly<\/a> with the right end fittings is cheaper than a hose that fails twice a year.<\/li>\n\n\n\n<li><strong>Support the hose, and protect it where it meets an edge.<\/strong> Clamps hold the hose in its natural curve and stop it sagging into another component; spiral guards, spring guards, and sleeves reduce abrasion at the exact point where a tight bend presses the cover into contact.<\/li>\n\n\n\n<li><strong>Allow length for movement.<\/strong> A moving joint needs enough hose to reach its extreme positions without the radius dropping below the limit at either end of the stroke. Calculate the arc length at both extremes, not just at rest.<\/li>\n\n\n\n<li><strong>Recheck at pressure.<\/strong> Open the system to full working pressure, then confirm the radius and the clearance again. A hose that passes cold can pull tighter once the pressure is on.<\/li>\n\n\n\n<li><strong>Keep the hose inside its scope.<\/strong> A hydraulic hose carries fluid and pressure only: align ports with brackets, hold components with clamps, and carry loads with structural members. Where a hose is used to pull two ports into alignment, side load at the crimp becomes the failure point.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">Foire aux questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-minimum-bend-radius-of-a-1-2-inch-hydraulic-hose\">What is the minimum bend radius of a 1\/2 inch hydraulic hose?<\/h3>\n\n\n\n<p>A -8 (1\/2 inch) hose publishes a different minimum for every construction. A standard single-wire-braid hose to EN 853 1SN is 180 mm to the centreline; a compact two-wire hose to EN 857 2SC, published as SAE 100R16, is 130 mm; a four-spiral EN 856 4SP hose is 230 mm. Where the line flexes in service, allow about 270 mm on the standard construction, because the published figure is the static one. Check the convention as well: an inner-surface radius (R1) figure reads about 10.5 mm smaller than a centreline radius (R2) figure on the same 21.0 mm outside diameter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-minimum-bend-radius-of-a-3-8-inch-hydraulic-hose\">What is the minimum bend radius of a 3\/8 inch hydraulic hose?<\/h3>\n\n\n\n<p>A -6 (3\/8 inch) hose follows the same pattern: 130 mm to the centreline for EN 853 1SN single-wire-braid, 90 mm for the compact EN 857 2SC construction published as SAE 100R16, and 180 mm for a four-spiral EN 856 4SP hose of the same bore, because the extra spiral layers resist bending. On a moving line, the four-spiral figure is usually what decides the routing, not the braided figure, so confirm the construction before you read a number off a chart.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"does-bend-radius-change-when-the-hose-is-pressurized\">Does bend radius change when the hose is pressurized?<\/h3>\n\n\n\n<p>Yes \u2014 a pressurized hose usually needs the dynamic value rather than the static one (270 mm on the -8 EN 853 1SN hose). A hose that passes a template check cold can lose several millimetres of radius once full working pressure is applied, and a line in a hot compartment moves further as the rubber softens. The figure that matters is the one measured with the system at pressure and at operating temperature, not the figure recorded at assembly \u2014 which is why a -8 line that measures 212 mm cold still deserves margin above its 180 mm limit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"is-hydraulic-hose-bend-radius-the-same-as-hydraulic-pipe-or-tube-bend-radius\">Is hydraulic hose bend radius the same as hydraulic pipe or tube bend radius?<\/h3>\n\n\n\n<p>No. A steel tube is bent once, on a bender, to a fixed cold radius, and it holds that shape because the wall is rigid. A hose is flexible by design and carries its limit in the reinforcement instead, which is why hose figures are quoted against nominal bore or dash size while published tube figures are quoted against tube outside diameter. A -8 hose and a 1\/2 inch tube share a nominal bore but not a routing envelope, so use the hose data sheet for hose and the tube bender chart for tube.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-have-to-run-a-1-2-inch-hose-through-a-250-mm-gap-and-it-keeps-kinking-how-tight-can-i-bend-it-before-it-fails\">I have to run a 1\/2 inch hose through a 250 mm gap and it keeps kinking \u2014 how tight can I bend it before it fails?<\/h3>\n\n\n\n<p>A standard -8 single-wire-braid hose to EN 853 1SN may not be bent tighter than 180 mm to the centreline, and a 90-degree bend at that radius consumes 283 mm of hose \u2014 325 mm once the two straight lead-ins are added \u2014 so a 250 mm gap cannot hold that curve without forcing the hose below its limit. Three fixes work: reduce the bend angle with an elbow fitting, move to a compact construction such as EN 857 2SC (published as SAE 100R16) whose -8 minimum is 130 mm, or re-route the line. Forcing the hose is the one option that ends in a kink.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"my-hose-failed-at-the-crimp-twice-this-year-and-the-bend-starts-right-at-the-fitting-what-did-we-do-wrong\">My hose failed at the crimp twice this year and the bend starts right at the fitting \u2014 what did we do wrong?<\/h3>\n\n\n\n<p>The bend is loading the crimp. A hose needs a straight section of roughly one outside diameter \u2014 21.0 mm on a -8 hose \u2014 between the crimped fitting and the start of the curve, and where that lead-in is missing, the side load sits on the crimp instead of being carried by the flexible length of the hose. Cut the replacement long enough to include the arc length of every bend plus a lead-in at both ends, and confirm that the ports line up without the hose pulling them together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"we-work-outdoors-and-the-machine-starts-at-20-c-does-the-bend-radius-on-the-data-sheet-still-apply\">We work outdoors and the machine starts at \u221220 \u00b0C \u2014 does the bend radius on the data sheet still apply?<\/h3>\n\n\n\n<p>The data sheet figure still applies, but it is not the number to design to. Rubber stiffens as it cools, and a common industry allowance is about 30 percent more radius below 0 \u00b0C (32 \u00b0F), which takes the -8 standard hose from 180 mm to roughly 234 mm for a cold-start installation. Cold-start pressure spikes are harder on a stiff hose, so allow the extra margin and confirm that the radius measured at room temperature still holds on the first cold start of the day.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"the-catalogue-says-centreline-radius-and-i-measured-the-inside-of-the-bend-am-i-inside-the-limit-or-not\">The catalogue says centreline radius and I measured the inside of the bend \u2014 am I inside the limit or not?<\/h3>\n\n\n\n<p>Compare like with like before you judge. If the catalogue figure is a centreline radius (R2) and your tape gives an inner-surface radius (R1), your measurement is smaller by half the hose outside diameter \u2014 10.5 mm on a -8 hose with a 21.0 mm outside diameter. To test the line against a 180 mm catalogue value, the inside-surface equivalent is 180 \u2212 10.5 = 169.5 mm, so any reading at or above 169.5 mm is inside the limit. State the convention next to the number on every drawing and purchase order, because that one word decides whether the assembly passes inspection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"final-verdict-calculate-once-route-correctly-stop-replacing-hoses\">Final Verdict: Calculate Once, Route Correctly, Stop Replacing Hoses<\/h2>\n\n\n\n<p>Bend radius is one of the few hose specifications you can verify with a tape measure, which makes it one of the easiest failure causes to design out. Read the hydraulic hose bend radius for the exact hose type and dash size, confirm which measurement convention and which static or dynamic figure it uses, convert it into the arc length the routing will consume, then build the installation with a straight lead-in at every fitting and the dynamic allowance wherever the hose moves.<\/p>\n\n\n\n<p>Do that, and the same hose that failed twice a season becomes a line you replace on schedule rather than on breakdown. If you are specifying an assembly for a tight space, the useful question to bring to a manufacturer is not just the dash size \u2014 it is the space you have, the working pressure you run, the dash size you need, the port type, and how far the hose has to move. Send us those five details and we will come back with the construction, the end fittings, and the radius your envelope can actually achieve. <a href=\"https:\/\/www.henghuahose.com\/fr\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact HENGHUA for a quote and free samples.<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Hydraulic hose bend radius is the smallest radius a hose can be bent to without kinking, collapsing its bore, or fatiguing the steel reinforcement that carries the pressure. Calculate it in three steps: read the minimum bend radius for your hose type and dash size from the data sheet, convert that radius into the hose [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5369,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[1941,565,1940,1942,566],"class_list":["post-5408","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-bend-radius-calculator","tag-hydraulic-hose-bend-radius","tag-hydraulic-hose-bend-radius-chart","tag-hydraulic-hose-routing","tag-minimum-bend-radius"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Hydraulic Hose Bend Radius: How to Calculate It | HENGHUA<\/title>\n<meta name=\"description\" content=\"Learn how to calculate hydraulic hose bend radius, read a minimum bend radius chart by dash size, and confirm the centreline or inside-surface convention.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.henghuahose.com\/fr\/hydraulic-hose-bend-radius-calculation-guide\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hydraulic Hose Bend Radius: How to Calculate &amp; 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