90 Degree Elbow SAE Female 90 Degree Cone Seat Hydraulic Hose Fitting: 27891 Series (SAE J513)

Why This 90 Degree Elbow Passes the Compliance Gate

The 27891 series is a 90 degree elbow SAE female 90 degree cone seat hydraulic hose fitting built to SAE J513, the 45 degree flare system used across North American hydraulic circuits. Its swivel female nut carries a precision-machined 90 degree cone seat that seals metal to metal against a male 90 degree cone, so there is no O-ring, sealant or thread tape to age, swell or leak. For OEMs, distributors and maintenance teams this means a repeatable, inspection-friendly joint that keeps its torque in high-vibration service.

Every size in the matrix below is checked against calibrated thread gauges and vernier calipers before it leaves the line, and every fitting is 100% pressure tested at the factory. Batch records, material certificates and plating results follow the lot, so a compliance audit can be closed from a single label on the box.

Core Advantages

1. Metal-to-metal seal per SAE J513: the 90 degree cone seat mates with a male 90 degree cone for a leak-free joint without soft seals.
2. Compact 90 degree routing: the elbow squares a hose run into pumps, valves and manifold edges without extra adapters, saving space in tight frames.
3. Standard size ladder: 7/16″X20 through 1.1/16″X14 threads, covering hose dash sizes -03 to -12 for braided hose assemblies.
4. Factory proof and traceability: 100% pressure testing, thread gauging, MTR with the order and batch-level records for OEM audits.

Technical Specifications

The data sheet below covers the 90 degree elbow SAE female 90 degree cone seat hydraulic hose fitting in the 27891 series. Threads, cone seats and dimensions are reproduced from the production drawing, and every value is re-verified during inspection. Use the dimension table to plan your routing and the dash chart to pair the fitting with the correct hose bore.

What Is a SAE Female 90 Degree Cone Seat Hydraulic Hose Fitting?

In the SAE J513 system the sealing face is a cone machined at 45 degrees to the thread axis, which gives the seat an included angle of 90 degrees. HENGHUA therefore lists these ends as female 90 degree cone seat ends, and the mating adapter is the SAE male 90 degree cone. When the two cones are drawn together by the nut, the metal faces deform elastically and form the seal; there is no gasket between them.

A SAE female 90 degree cone seat hydraulic hose fitting is the nut end of a hose assembly that connects to a male cone adapter on a pump, valve or manifold block. When you select one, check the thread pitch, confirm the seat is a true 45 degree flare cone (90 degree included angle), and never mix it with JIC 37 degree (SAE J514) or DIN 24 degree cone ends, because the cone angles are different and they cannot seal against each other.

Dimensional Data

All tabulated values are in millimetres and follow the letters marked on the product drawing; A is the key routing dimension for a 90 degree elbow. Series 27891 prints its height dimension column as S1, and HENGHUA reproduces the printed header without relabelling any value.

Full Dimension Table (Part Number Matrix)

Read the table as follows: PART NO. is the ordering code, E THREAD is the female thread, HOSE BORE gives the hose nominal bore (DN, mm) and its dash size, and the DIMENSIONS columns A, C, S1 and S2 are in millimetres. The part number is built as 27891-thread dash-hose dash, so 27891-06-06 means a 5/8″X18 thread end on a -06 (DN 10) hose. The drawing lists seven sizes, and thread dash and hose dash can differ, so confirm both when ordering.

Notes on the table, as printed on the source drawing: 1. The part numbers in the table are for braided hoses. 2. If the fitting is required for spiral hose, change the part number to 27892-XX-XX. Sizes not shown on the drawing, for example a 3/4″X16 thread end, can be confirmed on request with a short lead time; contact us with the thread, hose dash and quantity.

Matériaux et traitements thermiques

Working Pressure and Operating Envelope

The rated working pressure of a hose assembly that uses this SAE female 90 degree cone seat hydraulic hose fitting is set jointly by the hose construction and the end connection standard, so no single pressure figure is printed on this page. Every HENGHUA fitting is 100% factory pressure tested, and the crimp dimensions and torque data sheet that suit your hose brand and size are supplied with each order or quotation.

The typical fluid temperature envelope is -40 degree C to +120 degree C; always apply the derating factors of the hose and any seal materials in your system. Confirm fluid compatibility before use, and never exceed the lower of the hose rating or the connection rating in your circuit.

Selection and Ordering

How to Read the Part Number Matrix

The code 27891-06-06 breaks down as follows: 27891 is the series, a 90 degree elbow SAE female 90 degree cone seat hydraulic hose fitting; the first two digits after the dash give the thread dash (-06 = 5/8″X18, or 5/8″-18 UNF), and the last two digits give the hose dash (-06 = DN 10, 3/8″ nominal hose). Because the thread dash and hose dash can differ, always confirm both when ordering; a 27891-06-04 and a 27891-06-06 share the same nut but suit different hose bores.

Thread Size and Dash Chart

Series 27891 has no 3/4″X16 (thread dash -08) row on the source drawing; if your port is that size, send the thread and hose dash and we will confirm the closest code. Dash sizes follow SAE J517 hose sizing; match the hose dash to the actual inner diameter of your hose, not the outside diameter.

Cross Reference Service

If you are replacing an existing 90 degree elbow from another supplier and only have the old part number, send it to us with a photo and the thread size, and HENGHUA will map it to the nearest 27891 code, normally within 24 hours. Cross referencing is fastest when you also supply the hose dash size and the routing dimensions, because the elbow reach (A) and overall height are the values that most often differ between brands. The service is free and carries no obligation to order.

Emballage et logistique

Fittings are packed 10 pieces per inner box, and every box is labelled with the part number, batch number and quantity. Inner boxes are bundled into export cartons with a packing list, and the material test report travels with the shipment. All products are Made in China under the HENGHUA brand. Quotations are returned within 24 hours, samples are available before mass production, and mixed-size orders are consolidated to save freight.

Assembly and Use Guide

Four-Step Crimping Procedure

1. Cut the hose square with a sharp blade and blow out any debris from the bore.
2. Mark the insertion depth on the hose cover using the crimp data sheet value for your hose and fitting size.
3. Lubricate the shank and hose bore lightly, then push the fitting in to the depth mark without twisting.
4. Crimp with the correct die set, then verify the crimped outside diameter with a vernier caliper against the value on the data sheet.

Connecting the Female 90 Degree Cone Seat End

The 27891 end seals metal to metal: the male 90 degree cone (SAE 45 degree flare face, SAE J513) seats inside the female 90 degree cone seat of the swivel nut. Wipe the cone seat and the male cone clean and dry, check both surfaces for scratches, and run the nut up by hand before applying the final torque from the supplied data sheet. Never apply thread tape or sealant to this connection, and never use it with JIC 37 degree (SAE J514) or DIN 24 degree cone adapters, because the cone angles do not match and the joint will leak.

Installation Warnings

• Do not twist the hose while the swivel nut is being torqued; orient the 90 degree outlet first, then tighten the nut.
• Do not bend the hose tighter than its minimum bend radius at the elbow outlet; leave a short straight lead where the run is tight.
• Do not reuse a cone seat that is scratched, galled or deformed; the metal-to-metal seal needs a clean seat.
• Do not overtighten; torque is governed by the data sheet supplied with the order, not by feel.
• Keep the assembly away from sharp edges and hot surfaces, and route it clear of moving machine parts.
• Check the nut torque during the first hours of service on new installations.

OEM Customization and Quality Traceability

Customization Options

HENGHUA supplies 27891 as an OEM or private-label product: laser marking of your part number and logo, custom surface finish, stainless steel versions, and special packaging are all available. Minimum order quantities for customised versions are agreed at quotation stage, and samples are approved before series production. Tell us your thread, hose dash and routing dimensions and we will confirm the closest standard code.

Quality and Traceability System

Every batch is traceable from steel receipt to finished fitting through a batch number stamped on the box and recorded in production. Incoming material is verified against the MTR, hardness and plating are sampled per batch, and each piece passes thread gauging, dimensional inspection and a 100% factory pressure test. Records are kept for full traceability, and BV or SGS inspection can be arranged before shipment.

FAQ

1. What is a SAE female 90 degree cone seat hydraulic hose fitting? It is the nut end of a hose assembly that seals against a male 90 degree cone. In SAE J513 terms the cone face is at 45 degrees to the thread axis, so the seat angle is 90 degrees included; the seal is metal to metal.

2. Is SAE 45 degree flare (J513) the same as JIC 37 degree (SAE J514)? No. JIC uses a 37 degree cone and a different thread series, so the two systems cannot be interchanged. A 45 degree seat has a visibly wider cone (90 degrees included) than a JIC seat (74 degrees included).

3. How do I tell a 45 degree flare seat from a 37 degree JIC seat? Measure the cone angle or compare the thread: a SAE 45 degree flare -06 end is 5/8″-18, while a JIC -06 end is 9/16″-18. When the nut will not start on the male thread, stop and verify both the angle and the pitch.

4. Does this fitting need an O-ring, sealant or thread tape? No. The 90 degree cone seat seals metal to metal against the male cone. Tape or sealant is not needed and tape debris can contaminate the system, so keep the seat clean and dry.

5. Which hose types does the 27891 table cover? The part numbers in the table are for braided hoses. If your assembly uses spiral hose, order the equivalent 27892-XX-XX code instead of changing the nut or the crimp program.

6. How is the 27891 90 degree elbow different from the 27841 45 degree elbow? They use the same SAE J513 female cone seat sealing system, thread range and hose dash coverage; the difference is the routing angle and the body dimensions. Pick 27891 when the hose run must turn 90 degrees and 27841 when a 45 degree turn keeps the hose closer to the frame.

7. What working pressure can I expect? The working pressure of this SAE female 90 degree cone seat hydraulic hose fitting assembly is set by the hose construction together with the SAE J513 end connection. Every fitting is 100% factory pressure tested, and the crimp and torque data for your hose size is supplied with the order.

8. Can I order a size that is not in the table? Yes. Non-standard thread and hose dash combinations can be produced on request, including sizes the drawing does not list such as a 3/4″X16 thread end. Send the thread size, hose dash and the routing dimensions you need, and we will confirm availability and lead time.

Demander un devis

For a 90 degree elbow SAE female 90 degree cone seat hydraulic hose fitting, send us the following to get a quotation within 24 hours: hose type and dash size, required thread (E THREAD), quantity and target price, and the routing dimensions (A and overall height) if you are replacing an existing part. Include a photo of the old fitting or its part number for fast cross reference. Samples are available before mass production, and our engineers will confirm the correct 27891 or 27892 code for your braided or spiral hose assembly.

Browse the full Raccords hydrauliques SAE range for the complete family, or contact us to request a quote, mill test reports, and samples.