{"id":4797,"date":"2026-09-16T08:20:08","date_gmt":"2026-09-16T08:20:08","guid":{"rendered":"https:\/\/www.henghuahose.com\/?post_type=product&#038;p=4797"},"modified":"2026-09-16T09:13:30","modified_gmt":"2026-09-16T09:13:30","slug":"metric-74-cone-flared-sleeve-gbt-5646-adapter-nb500-q","status":"publish","type":"product","link":"https:\/\/www.henghuahose.com\/de\/product\/metric-74-cone-flared-sleeve-gbt-5646-adapter-nb500-q\/","title":{"rendered":"Metric 74 Degree Cone Flared Sleeve Adapter NB500-Q (GB\/T 5646 Flared Tube Sleeve)"},"content":{"rendered":"\r\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/metric-74-cone-flared-sleeve-gbt-5646-adapter-nb500-q-spec.jpg\" alt=\"Metric 74 degree cone flared sleeve GB\/T 5646 hydraulic adapter NB500-Q specification and dimension chart\" \/><\/figure>\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Why This Metric 74 Degree Cone Flared Sleeve Adapter NB500-Q Passes the Compliance Gate<\/h2>\r\n\r\n\r\n\r\n<p>The <strong>metric 74 degree cone flared sleeve adapter NB500-Q<\/strong> is the flared sleeve of the GB\/T 5646 system, and it is the part that actually touches the tube. It slides over the tube behind the flare, and when the matching NB200-Q nut is tightened the sleeve pushes the 74 degree flare onto the adapter cone, producing a metal-to-metal seal.<\/p>\r\n\r\n\r\n\r\n<p>The sleeve is therefore the part that decides whether the joint holds. A nut with no sleeve, a sleeve of the wrong size, or a sleeve fitted the wrong way round all leave the flare unseated, and no amount of torque will recover the joint. Because the sleeve is pressed against the flare every time the joint is tightened, it is also the part that is normally renewed rather than re-used.<\/p>\r\n\r\n\r\n\r\n<p>Three facts matter when ordering:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>The sleeve is selected by the tube outside diameter, not by the thread. The published table lists the tube size, the sleeve dimensions, and the nut it is dimensionally paired with.<\/li>\r\n<li>The sleeve and its nut must come from the same tube size row. NB500-14Q belongs with NB200-22Q on a 14 mm tube, and no other combination is correct.<\/li>\r\n<li>One nut row serves two sleeve-compatible cases: a 20 mm tube sleeve NB500-20Q is listed with both <code>NB200-30Q<\/code> (M30X1.5) and <code>NB200-30EQ<\/code> (M30X2).<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Core Advantages<\/h3>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li><strong>Published nut pairing.<\/strong> Every sleeve row is listed with the nut it fits, so a joint can be ordered complete in one step.<\/li>\r\n<li><strong>Full flared tube range.<\/strong> Eleven published sleeve sizes from a 5 mm tube to a 25 mm tube.<\/li>\r\n<li><strong>Correct 74 degree geometry.<\/strong> The sleeve is dimensioned for the 74 degree flare system, not for a bite-type ring.<\/li>\r\n<li><strong>Renewable wear part.<\/strong> Replacement sleeves keep repaired joints reliable without changing the nut or the adapter body.<\/li>\r\n<li><strong>Batch traceability.<\/strong> Heat number, production batch and inspection records are tied to each carton.<\/li>\r\n<li><strong>OEM marking and kit packing.<\/strong> Customer numbers can be laser marked, and sleeve and nut can be packed as a matched kit.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Technical Specifications<\/h2>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">What Is a Metric 74 Degree Cone Flared Sleeve Adapter?<\/h3>\r\n\r\n\r\n\r\n<p>The metric 74 degree cone flared sleeve adapter NB500-Q is the sleeve of the GB\/T 5646 flared tube system, the companion part to the GB\/T 5647 nut. In this system the tube end is cut square, deburred, and flared to 74 degrees; the nut is then slid on, the sleeve follows, and the nut is tightened so that the sleeve forces the flare onto the adapter cone.<\/p>\r\n\r\n\r\n\r\n<p>The sleeve does not seal on a thread and is not welded. The sealing surface is the flared tube end on the cone, and the sleeve is the load path that presses it there.<\/p>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Confusion risk<\/th>\r\n<th>What it looks like<\/th>\r\n<th>Why the correct sleeve matters<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Flared sleeve vs bite-type ring<\/td>\r\n<td>Both sit behind the tube end<\/td>\r\n<td>A bite-type ring cuts into the tube surface; this sleeve presses a pre-formed 74 degree flare onto a cone<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>GB\/T 5646 sleeve vs other flare systems<\/td>\r\n<td>Similar cylindrical look<\/td>\r\n<td>Diameters and length are matched to the GB\/T 5647 nut and the 74 degree cone, so other sleeves will not seat the flare<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>74 degree cone vs 60 degree or 24 degree systems<\/td>\r\n<td>Threads may appear to match<\/td>\r\n<td>The cone angle decides the joint; a 60 degree seat (JIS B 8363) or a 24 degree cone cannot be clamped by this sleeve<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Dimensional Data<\/h3>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Symbol<\/th>\r\n<th>Meaning<\/th>\r\n<th>Unit<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>PART NO.<\/td>\r\n<td>Ordering code of the sleeve<\/td>\r\n<td>&#8211;<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>TUBE O.D.<\/td>\r\n<td>Tube outside diameter the sleeve is dimensioned for<\/td>\r\n<td>mm<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>D<\/td>\r\n<td>Sleeve outside diameter dimension as marked in the drawing<\/td>\r\n<td>mm<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>L<\/td>\r\n<td>Sleeve length dimension as marked in the drawing<\/td>\r\n<td>mm<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NUT<\/td>\r\n<td>The nut part number dimensionally paired with the sleeve<\/td>\r\n<td>&#8211;<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Full Dimension Table (Part Number Matrix)<\/h3>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>PART NO.<\/th>\r\n<th>TUBE O.D. (mm)<\/th>\r\n<th>D (mm)<\/th>\r\n<th>L (mm)<\/th>\r\n<th>MATCHING NUT<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>NB500-05Q<\/td>\r\n<td>5<\/td>\r\n<td>8.7<\/td>\r\n<td>10<\/td>\r\n<td>NB200-10Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-06Q<\/td>\r\n<td>6<\/td>\r\n<td>10.3<\/td>\r\n<td>11<\/td>\r\n<td>NB200-12Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-08Q<\/td>\r\n<td>8<\/td>\r\n<td>12.1<\/td>\r\n<td>12<\/td>\r\n<td>NB200-14Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-10Q<\/td>\r\n<td>10<\/td>\r\n<td>14.1<\/td>\r\n<td>13<\/td>\r\n<td>NB200-16Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-12Q<\/td>\r\n<td>12<\/td>\r\n<td>16.1<\/td>\r\n<td>14<\/td>\r\n<td>NB200-18Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-14Q<\/td>\r\n<td>14<\/td>\r\n<td>20.1<\/td>\r\n<td>15<\/td>\r\n<td>NB200-22Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-16Q<\/td>\r\n<td>16<\/td>\r\n<td>22.1<\/td>\r\n<td>16<\/td>\r\n<td>NB200-24Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-18Q<\/td>\r\n<td>18<\/td>\r\n<td>25.1<\/td>\r\n<td>17<\/td>\r\n<td>NB200-27Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-20Q<\/td>\r\n<td>20<\/td>\r\n<td>28.1<\/td>\r\n<td>18<\/td>\r\n<td>NB200-30Q, NB200-30EQ<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-22Q<\/td>\r\n<td>22<\/td>\r\n<td>30.5<\/td>\r\n<td>20<\/td>\r\n<td>NB200-33Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-25Q<\/td>\r\n<td>25<\/td>\r\n<td>33.5<\/td>\r\n<td>20<\/td>\r\n<td>NB200-36Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>NB500-28Q<\/td>\r\n<td>28<\/td>\r\n<td>[to be confirmed]<\/td>\r\n<td>[to be confirmed]<\/td>\r\n<td>[to be confirmed]<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Thread Size and Dash Chart<\/h3>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Tube O.D. (mm)<\/th>\r\n<th>Sleeve PART NO.<\/th>\r\n<th>Sleeve D x L (mm)<\/th>\r\n<th>Matching nut PART NO.<\/th>\r\n<th>Nut thread<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>5<\/td>\r\n<td>NB500-05Q<\/td>\r\n<td>8.7 x 10<\/td>\r\n<td>NB200-10Q<\/td>\r\n<td>M10X1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>6<\/td>\r\n<td>NB500-06Q<\/td>\r\n<td>10.3 x 11<\/td>\r\n<td>NB200-12Q<\/td>\r\n<td>M12X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>8<\/td>\r\n<td>NB500-08Q<\/td>\r\n<td>12.1 x 12<\/td>\r\n<td>NB200-14Q<\/td>\r\n<td>M14X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>10<\/td>\r\n<td>NB500-10Q<\/td>\r\n<td>14.1 x 13<\/td>\r\n<td>NB200-16Q<\/td>\r\n<td>M16X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>12<\/td>\r\n<td>NB500-12Q<\/td>\r\n<td>16.1 x 14<\/td>\r\n<td>NB200-18Q<\/td>\r\n<td>M18X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>14<\/td>\r\n<td>NB500-14Q<\/td>\r\n<td>20.1 x 15<\/td>\r\n<td>NB200-22Q<\/td>\r\n<td>M22X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>16<\/td>\r\n<td>NB500-16Q<\/td>\r\n<td>22.1 x 16<\/td>\r\n<td>NB200-24Q<\/td>\r\n<td>M24X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>18<\/td>\r\n<td>NB500-18Q<\/td>\r\n<td>25.1 x 17<\/td>\r\n<td>NB200-27Q<\/td>\r\n<td>M27X1.5<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>20<\/td>\r\n<td>NB500-20Q<\/td>\r\n<td>28.1 x 18<\/td>\r\n<td>NB200-30Q or NB200-30EQ<\/td>\r\n<td>M30X1.5 or M30X2<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>22<\/td>\r\n<td>NB500-22Q<\/td>\r\n<td>30.5 x 20<\/td>\r\n<td>NB200-33Q<\/td>\r\n<td>M33X2<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>25<\/td>\r\n<td>NB500-25Q<\/td>\r\n<td>33.5 x 20<\/td>\r\n<td>NB200-36Q<\/td>\r\n<td>M36X2<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>28<\/td>\r\n<td>NB500-28Q<\/td>\r\n<td>[to be confirmed]<\/td>\r\n<td>[to be confirmed]<\/td>\r\n<td>[to be confirmed]<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Material and Heat Treatment<\/h3>\r\n\r\n\r\n\r\n<p>The series drawing states no material grade, so the following describes typical production and is confirmed on the purchase order.<\/p>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Item<\/th>\r\n<th>Typical supply<\/th>\r\n<th>Notes<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Sleeve material<\/td>\r\n<td>Carbon steel<\/td>\r\n<td>Machined sleeve, dimensioned for the 74 degree flare<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Alternative<\/td>\r\n<td>Stainless steel 304 \/ 316L<\/td>\r\n<td>On request<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Heat treatment<\/td>\r\n<td>Stress relief per raw material state<\/td>\r\n<td>Not a certified cycle unless specified<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Surface finish<\/td>\r\n<td>Trivalent zinc plating (Cr(VI)-free)<\/td>\r\n<td>Zn-Ni and other coatings on request<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Inspection<\/td>\r\n<td>Diameter, length and bore check<\/td>\r\n<td>Records per batch on request<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Documentation<\/td>\r\n<td>Material certificate on request<\/td>\r\n<td>BV or SGS inspection can be arranged<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Working Pressure and Operating Envelope<\/h3>\r\n\r\n\r\n\r\n<p>The published drawing carries no pressure column, so no pressure rating is claimed for this series. Working pressure of a finished flared joint is governed by the port standard together with the tube and sleeve grade selected, and the finished assembly is only as strong as its weakest member.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>The flare sleeve carries the clamping load of the joint, so it must be replaced whenever the flare has been re-cut or the tube replaced.<\/li>\r\n<li>Data sheets referenced to the flared tube system standards (GB\/T 5646 and GB\/T 5647) can be supplied on request.<\/li>\r\n<li>Each batch is inspected and packed with batch records as part of the standard HENGHUA fitting workflow.<\/li>\r\n<li>For safety-critical circuits, rate the assembly from the lowest rated element: tube, flare, sleeve, nut or adapter body.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Temperature Range<\/h3>\r\n\r\n\r\n\r\n<p>A typical service window for a steel flared joint with a metal-to-metal cone seal is -40 degrees C to +120 degrees C. The real limit is set by the tube and by the connected hose or adapter body, not by the sleeve. Outside that window, specify the complete joint material set and confirm with our engineering desk.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">How to Read the Part Number Matrix<\/h2>\r\n\r\n\r\n\r\n<p>The metric 74 degree cone flared sleeve adapter NB500-Q is coded with a family block, a two digit tube size and a system letter.<\/p>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Code<\/th>\r\n<th>Reading<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><code>NB500-14Q<\/code><\/td>\r\n<td>Flared sleeve for a 14 mm tube, D = 20.1 mm, L = 15 mm, pairing with nut NB200-22Q<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><code>NB500-20Q<\/code><\/td>\r\n<td>Flared sleeve for a 20 mm tube, D = 28.1 mm, L = 18 mm, pairing with NB200-30Q or NB200-30EQ<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><code>NB500-28Q<\/code><\/td>\r\n<td>Flared sleeve for a 28 mm tube; the drawing is cropped at this row, so its D and L values are to be confirmed<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<p><code>NB500<\/code> identifies the GB\/T 5646 flared tube sleeve family, the number is the tube outside diameter in millimetres, and <code>Q<\/code> marks the 74 degree cone flared system.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Selection and Ordering<\/h2>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Selection Checklist \/ Decision Table<\/h3>\r\n\r\n\r\n\r\n<p>Confirm the following points before ordering the metric 74 degree cone flared sleeve adapter NB500-Q.<\/p>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Question<\/th>\r\n<th>If yes<\/th>\r\n<th>If no<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Is the joint a 74 degree flared tube system?<\/td>\r\n<td>The NB500-Q sleeve family applies<\/td>\r\n<td>A bite-type or welded system is required instead<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Is the tube outside diameter known?<\/td>\r\n<td>Pick the matching row directly<\/td>\r\n<td>Measure the tube O.D. and confirm<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Is the nut known?<\/td>\r\n<td>Cross-check the MATCHING NUT column<\/td>\r\n<td>Order sleeve and nut together as a pair<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Is the tube end being re-flared?<\/td>\r\n<td>Fit a new sleeve<\/td>\r\n<td>An existing sleeve may be re-used only if it is undamaged<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Is the tube end welded elsewhere?<\/td>\r\n<td>Keep the weld clear of the flare zone<\/td>\r\n<td>A welded end cannot replace the flare<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Is corrosion or high temperature involved?<\/td>\r\n<td>Specify 304 \/ 316L and confirm the tube grade<\/td>\r\n<td>Carbon steel with trivalent zinc plating<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Cross Reference Service<\/h3>\r\n\r\n\r\n\r\n<p>Send a photograph of the worn sleeve with the tube outside diameter and the sleeve outside diameter, and we will identify the correct row and its matching nut free of charge, normally within 24 hours. We do not copy or re-label another company&#8217;s brand; we match the interface and the drawing.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Packaging and Logistics<\/h3>\r\n\r\n\r\n\r\n<p>Individual poly bags with size labels or bulk bags per size, carton marking with batch and heat number, mixed-size consolidation in one shipment, and air freight or courier for urgent requirements. Sleeves and nuts can be supplied as matched kits on request, and material certificates travel with the goods when requested.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Installation and Fitment Guide<\/h2>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Step-by-Step Assembly<\/h3>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li><strong>Cut the tube square.<\/strong> Measure the cut with a square; an angled cut produces a flare that does not sit squarely on the cone.<\/li>\r\n<li><strong>Deburr inside and outside.<\/strong> Remove the burr so the sleeve can slide freely and the flare forms without cracking.<\/li>\r\n<li><strong>Anneal hard tube ends where required.<\/strong> If the tube grade or the drawing calls for annealing before flaring, do it before the flare is formed.<\/li>\r\n<li><strong>Slide the nut on first, then the sleeve.<\/strong> The nut must go onto the tube before the flare is made; the sleeve follows, in the orientation shown in the drawing.<\/li>\r\n<li><strong>Flare the tube end to 74 degrees<\/strong> with a tool that produces the correct cone angle and flare diameter. Reject a cracked or split flare and start again.<\/li>\r\n<li><strong>Seat and tighten.<\/strong> Push the tube forward so the flare contacts the adapter cone squarely, then tighten the nut to the published torque with a backing wrench on the adapter body, and leak test at working pressure.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Tube End Requirements<\/h3>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Requirement<\/th>\r\n<th>Why it matters<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Square cut, no burr<\/td>\r\n<td>An angled or burred end produces an off-centre flare and a leak path<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Round, undamaged tube<\/td>\r\n<td>Ovality prevents the sleeve from contacting the flare evenly<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Correct flare angle of 74 degrees<\/td>\r\n<td>A 60 degree or 24 degree flare will not seat on this cone<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flare concentric with the tube axis<\/td>\r\n<td>An off-centre flare loads one side of the sleeve and weeps<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Weld beads kept clear of the flare zone<\/td>\r\n<td>The sleeve seals on the flare, not on a weld, so a welded end cannot substitute for it<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Correct tube material and hardness<\/td>\r\n<td>Very hard or work-hardened tube can crack during flaring unless annealed<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Torque and Sealing Notes<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Use the torque figure published for the thread size and tube grade; the sleeve is compressed during tightening and must not be over-loaded.<\/li>\r\n<li>The seal is made by the flared tube end on the 74 degree cone, so no sealant is applied to the flare or to the sleeve.<\/li>\r\n<li>The nut must run down freely by hand before final torque; a binding nut indicates a cross thread, the wrong pitch, or a sleeve that has not seated.<\/li>\r\n<li>Fit a new sleeve whenever the tube end has been re-flared.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Installation Warnings<\/h3>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>\u2714 Confirm the sleeve and the nut come from the same tube size row.<\/li>\r\n<li>\u2714 Confirm the flare angle is 74 degrees before assembly.<\/li>\r\n<li>\u2714 Hold the adapter body with a backing wrench while tightening the nut.<\/li>\r\n<li>\u2714 Re-test at working pressure after any re-torque.<\/li>\r\n<li>\u274c Never assemble a flared joint without the sleeve; the nut alone cannot clamp the flare.<\/li>\r\n<li>\u274c Never fit the sleeve backwards or use a sleeve from another tube size.<\/li>\r\n<li>\u274c Never re-use a sleeve that has been crushed, scored or stretched.<\/li>\r\n<li>\u274c Never mix this sleeve with a bite-type nut or a 60 degree cone adapter body.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Applications and Industries<\/h2>\r\n\r\n\r\n\r\n<p>The metric 74 degree cone flared sleeve adapter NB500-Q is used wherever flared tube joints are made, repaired or stocked as matched pairs with the nut.<\/p>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Application<\/th>\r\n<th>Why this sleeve fits<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Flared tube fabrication<\/td>\r\n<td>Standard GB\/T 5646 sleeve for 74 degree flare joints<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Repair of imported machinery<\/td>\r\n<td>Replacement sleeve for lines built to the flared 74 degree system<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Test rigs and instrument lines<\/td>\r\n<td>Joints re-made reliably with a fresh sleeve<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Mobile machinery service<\/td>\r\n<td>Sleeve and nut stocked as matched kits<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Marine and offshore systems<\/td>\r\n<td>Traceable batch records and material certificates<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Industrial plant maintenance<\/td>\r\n<td>One family covering 5 mm to 25 mm tubes<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<p>Industry tags: hydraulics, tube fabrication, repair workshops, test benches, mobile machinery, marine, mining, plant maintenance.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Common Fitting Faults to Avoid<\/h2>\r\n\r\n\r\n\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Fault<\/th>\r\n<th>What happens<\/th>\r\n<th>Correct practice<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Sleeve omitted when re-making a joint<\/td>\r\n<td>The nut clamps nothing and the joint weeps at the first pressure cycle<\/td>\r\n<td>Always fit a sleeve before the flare is presented<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Sleeve fitted back to front<\/td>\r\n<td>The sleeve cannot press the flare correctly and the tube is pushed back<\/td>\r\n<td>Follow the drawing orientation<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Sleeve from the wrong tube size<\/td>\r\n<td>The flare is loaded off centre and the tube end deforms<\/td>\r\n<td>Match the tube O.D. row in the table<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Re-used crushed sleeve<\/td>\r\n<td>Torque no longer reaches the flare<\/td>\r\n<td>Fit a new sleeve each time the joint is opened<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Over-torque to stop a leak<\/td>\r\n<td>Flare cracks or the tube end is crushed<\/td>\r\n<td>Re-cut and re-flare, then torque to the published value<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Welded end used instead of a flare<\/td>\r\n<td>The sleeve has no flare to press<\/td>\r\n<td>Form a 74 degree flare; keep welds clear of the flare zone<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">OEM Customization and Quality Traceability<\/h2>\r\n\r\n\r\n\r\n<p>HENGHUA produces hydraulic adapters, flared tube components and complete hose assemblies alongside its Globhose hose programme, so the metric 74 degree cone flared sleeve adapter NB500-Q can be supplied alone or as a matched sleeve and nut kit.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Laser marking and private labelling<\/strong> with customer logo, part number and lot code.<\/li>\r\n<li><strong>Custom surface treatment<\/strong> including trivalent zinc and Zn-Ni.<\/li>\r\n<li><strong>Drawing or sample based production<\/strong>, with quotation typically within 24 hours.<\/li>\r\n<li><strong>Batch traceability<\/strong> from heat number to carton label.<\/li>\r\n<li><strong>Testing and documentation<\/strong>: material certificates and BV or SGS inspection on request.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\r\n\r\n\r\n\r\n<p><strong>Q: What is the difference between the NB500-Q sleeve and the NB200-Q nut?<\/strong> A: The sleeve contacts the tube behind the flare and presses it onto the 74 degree cone, while the nut provides the clamping force through its thread. Both are needed, and they must be matched by tube size.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: Can I fit the NB500-Q sleeve without the nut?<\/strong> A: No. The sleeve only deforms and clamps when the nut pulls it forward onto the flare, so the two parts always work as a pair.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: How do I know which nut fits this sleeve?<\/strong> A: Read the MATCHING NUT column. For example NB500-14Q pairs with NB200-22Q on a 14 mm tube, while NB500-20Q pairs with NB200-30Q or NB200-30EQ on a 20 mm tube.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: What does the tube end need before assembly?<\/strong> A: A square cut, a deburred end, annealing where the tube grade requires it, and a 74 degree flare that is concentric, uncracked and matched to the tube size. Welding does not replace the flare, because the sleeve seals on the flare.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: Which way round does the sleeve go?<\/strong> A: The sleeve is fitted behind the flare in the orientation shown in the series drawing, with the nut already on the tube. Fitting it backwards prevents the flare from being pressed onto the cone.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: What pressure does the joint hold?<\/strong> A: The drawing carries no pressure column, so no rating is claimed. The limit depends on the tube wall, the flare quality and the sleeve, and the assembly is only as strong as its weakest member.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: What material is the sleeve made from?<\/strong> A: Typical production is carbon steel with trivalent zinc plating; stainless steel 304 or 316L is available on request. Confirm the grade on the purchase order.<\/p>\r\n\r\n\r\n\r\n<p><strong>Q: Where can I buy the metric 74 degree cone flared sleeve adapter NB500-Q with matching nuts?<\/strong> A: Order the sleeve and nut together by PART NO., for example NB500-14Q with NB200-22Q, and state the material or coating and quantity. Quotations are answered within 24 hours and standard sizes ship in 7 day batches.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Request a Quote<\/h2>\r\n\r\n\r\n\r\n<p>Send the tube outside diameter, the matching nut PART NO. if known, the material or coating and the quantity, and we will confirm the correct row of the metric 74 degree cone flared sleeve adapter NB500-Q table, normally within 24 hours. Order the sleeve with its nut and the flared tube joint arrives as a complete matched set; if you are replacing unmarked parts, send a photograph with the tube and sleeve diameters and we will identify both free of charge.<\/p>\r\n\r\n\r\n\r\n<p>Browse the full <a href=\"https:\/\/www.henghuahose.com\/product-category\/hydraulic-adapters\/\" target=\"_blank\" rel=\"noopener\">Hydraulic Adapters<\/a> range for the complete family, or <a href=\"https:\/\/www.henghuahose.com\/contact\/\" target=\"_blank\" rel=\"noopener\">contact us<\/a> to request a quote, mill test reports, and samples.<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>The metric 74 degree cone flared sleeve adapter NB500-Q is the sleeve of the GB\/T 5646 flared tube system, fitted behind the tube flare so the matching NB200-Q nut can press the 74 degree flare onto an adapter cone. Eleven sizes cover 5 mm to 25 mm tubes, each listed with the nut it pairs with. Typical production is carbon steel with trivalent zinc plating, batch traced, with stainless steel and matched nut kits on request.<\/p>","protected":false},"featured_media":4795,"comment_status":"open","ping_status":"closed","template":"","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":"default","adv-header-id-meta":"","stick-header-meta":"default","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":""}}},"product_brand":[],"product_cat":[1426],"product_tag":[1546,1545,1544,1547,1548],"class_list":{"0":"post-4797","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-hydraulic-adapters","7":"product_tag-flared-sleeve-and-nut-pair","8":"product_tag-gb-t-5646-flared-tube-sleeve","9":"product_tag-metric-74-degree-cone-flared-sleeve-adapter-nb500-q","10":"product_tag-metric-flare-sleeve-74-degree-cone","11":"product_tag-nb500-q-sleeve","12":"desktop-align-left","13":"tablet-align-left","14":"mobile-align-left","15":"ast-product-gallery-layout-horizontal-slider","16":"ast-product-tabs-layout-horizontal","18":"first","19":"instock","20":"shipping-taxable","21":"product-type-simple"},"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>Metric 74\u00b0 Cone Flared Sleeve NB500-Q | GB\/T 5646 HENGHUA<\/title>\n<meta name=\"description\" content=\"metric 74 degree cone flared sleeve adapter NB500-Q to GB\/T 5646, 5 mm to 25 mm tubes, pairs with NB200-Q nuts. 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