87311-RW SAE Flange Fitting 3000 PSI

Our SAE flange fitting 3000 psi, series 87311-RW, is a crimp-on hydraulic hose fitting with an SAE J518 Code 61 four-bolt flange head. It connects braided hydraulic hose to SAE flange ports on pumps, valve manifolds and cylinders used in heavy hydraulic systems. The range covers 1/2″ to 2.1/2″ flange sizes, dash size -08 to -40, hose bore DN12 to DN64. Every fitting is 100% dimensionally inspected before shipment.

Compliance and standards:

• SAE J518 Code 61 (four-bolt flange, 3000 psi series)
• ISO 6162 (flange connections for fluid power)
• ISO 12151-3 (hose fittings with flange ends)
• SAE J516 (general hydraulic hose fitting design reference)

Why buyers choose this fitting:

• The heavy-duty connection. Four-bolt flange joints are the standard choice for large bore, high flow hydraulic lines where threaded connections become impractical.
• O-ring face seal. The flange face carries an O-ring groove. The compressed O-ring seals against the mating flange face, with no metal-to-metal fit-up and no leakage under impulse.
• Full flange size range. 1/2″ through 2.1/2″ (SAE J518 Code 61), covering flange ports from DN12 to DN64.
• Wide temperature range. Rated for -40°C to +100°C continuous duty, verified in our production line tests.

SAE Flange Fitting 3000 PSI Technical Specifications

The table below lists all 15 sizes of the 87311-RW SAE flange fitting 3000 psi. Dimensions are in millimeters. Flange dimensions follow SAE J518 Code 61. Dim. A is the length from the flange face to the hose-end shoulder, Dim. C is the flange head outside diameter, Dim. D is the bolt hole center distance, and Dim. L is the flange head thickness.

Notes: Dim. C (flange O.D.) and Dim. D (bolt spacing) match the SAE J518 Code 61 standard exactly, so these fittings bolt directly onto any Code 61 flange port. The -RW suffix denotes the braided-hose version; for spiral-wound hose, use series 87312-XX-XXRW.

Why Flange Connections for Big Lines

When the hose bore grows beyond about DN32, threaded connections become heavy, awkward and hard to torque reliably. The four-bolt flange solves this: the joint is clamped with four bolts, the O-ring on the flange face carries the seal, and the connection is assembled with ordinary wrenches instead of torque multiplication tools.

This SAE flange fitting 3000 psi is the standard solution for pump suction and discharge lines, valve manifold connections and reservoir lines in mobile and industrial hydraulics. The Code 61 flange pattern (3000 psi series) is the most widely used flange standard in the world, so this fitting mates directly with existing flange ports without adapters.

How the Flange O-Ring Seals

The flange face of this fitting carries an O-ring groove. When the four bolts are tightened, the O-ring is compressed between this flange face and the mating flange face of the port. The O-ring, not the metal faces, carries the seal. This is the same face-seal philosophy as the ORFS system, scaled up for large bores and high flow rates.

The seal tolerates minor surface scratches on the flange faces, withstands high impulse pressure without loosening, and can be serviced by simply replacing the O-ring. Our impulse testing found that flange assemblies hold pressure cycling reliably across the full temperature range.

Insert Depth and Crimp O.D. – The Two Numbers Engineers Ask For

Insert depth is the length of the barbed tail that enters the hose bore. Crimp O.D. is the outside diameter of the ferrule after crimping. Together they decide whether the assembly holds pressure or leaks at the crimp zone.

HENGHUA publishes the matched insert depth and crimp O.D. for every hose construction we supply, including SAE 100 R1AT, R2AT and EN 853 1SN / 2SN. The values are hose-specific because reinforcement thickness changes the stack-up. Request our crimp data sheet with your hose model and we will return the exact crimp O.D. and die selection within one working day.

Our production testing found that a verified crimp O.D. within the published tolerance (typically +/- 0.2 mm) gives a burst safety margin of 4:1 or higher on the complete assembly. Measure with a digital caliper after every crimp.

Material and Heat Treatment

• Carbon steel (standard): high-strength cold-headed or hot-forged carbon steel (20# / 35# / 45# grades). The tail and flange are case-hardened with a carburizing and quenching process for fatigue resistance. Reference hardness range is HRC 20-28 on the core with a hardened case.
• Surface finish: white zinc or color (yellow) zinc plating with passivation. Optional zinc-nickel and Dacromet coatings are available for higher salt spray requirements.
• Stainless steel (option): 304, 316 or 316L stainless steel for corrosive media and washdown environments.

Pressure and Temperature Ratings

The connection rating follows the SAE J518 Code 61 reference table below. These are reference values (§) for the fitting connection itself. The final working pressure of a hose assembly is set by the hose construction and the approved crimping specification.

§Reference values per SAE J518 Code 61 (3000 psi series) connection classes. Confirm the assembly rating with the HENGHUA crimp data sheet matched to your hose.

Temperature range: -40°C to +100°C for the fitting in continuous service. At elevated temperature, apply the standard SAE J517 style derating to the assembly working pressure. Our technical data sheet includes a pressure-temperature derating chart; contact us and we will send it with your quotation.

Pressure testing: HENGHUA can supply assemblies proof-tested up to 100% of the rated working pressure, with test certificates on request.

How to Select the Right SAE Flange Fitting 3000 PSI

Selection is a three-step process. First, match the hose bore to the dash size. Second, match the flange size to your port. Third, confirm the hose construction version (-RW for braided, 87312 series for spiral).

Part Number Structure

Read any HENGHUA part number in three segments. Example: 87311-16-16RW.

Select by Hose Series

The 87311-RW fitting is designed for braided hydraulic hose. Recommended matching constructions:

• SAE 100 R1AT (one wire braid) – for -08 to -40 sizes
• SAE 100 R2AT (two wire braid) – for -08 to -40 sizes
• EN 853 1SN and 2SN (equivalent European constructions)
• Spiral constructions (EN 856 4SP / 4SH) – use the 87312 series version

Select by Flange Size

The flange head follows the SAE J518 Code 61 pattern, which bolts directly onto standard Code 61 flange ports:

• Small sizes: 1/2″ and 3/4″ flange (dash -08 to -16)
• Medium sizes: 1″ and 1.1/4″ flange (dash -12 to -20)
• Large sizes: 1.1/2″, 2″ and 2.1/2″ flange (dash -20 to -40)

Assembly uses four standard bolts (not supplied) and the O-ring on the flange face. Tighten the bolts in a cross pattern to the torque value on the data sheet.

Cross Reference

This series replaces equivalent SAE J518 Code 61 flange fittings available in the market. If you hold an OEM part number or a competitor catalog number, send it to our sales team. We confirm the direct replacement within 24 hours, including flange size, dash size and insert depth checks.

Packaging and Logistics

Assembly Guide: Four Steps to a Safe Hose Assembly

Follow this process for every crimped assembly. It applies to every SAE flange fitting 3000 psi size from dash -08 to -40. Skipping one step is the most common cause of early fitting failure.

Step 1 – Cut the hose square. Use a sharp hose cutter. A square cut face lets the fitting seat evenly inside the hose. A beveled or ragged cut leaves voids that become leak paths.

Step 2 – Mark the insert depth. Measure the insert depth from the HENGHUA crimp data sheet. Mark a line on the hose cover at that distance. The mark must remain visible after insertion.

Step 3 – Lubricate and insert. Apply a thin layer of compatible assembly lubricant to the hose bore and the barbed tail. Push the fitting in with a twisting motion until the depth mark aligns with the tail end. Stop at the mark. Do not force past it.

Step 4 – Crimp and verify. Select the correct die set for your hose and fitting size. Crimp in one continuous stroke. After crimping, measure the crimp O.D. with a digital caliper and compare it with the tolerance on the crimp data sheet. Record the value on your quality log. A correct crimp O.D. is the difference between a 10-year assembly and a field failure.

Safety Warnings – Read Before Crimping

• Never mix brands. Hoses and fittings from different manufacturers may share the same dimensions but use different crimp parameters. Always use a matched hose, fitting and crimp data sheet.
• Never seal the flange face with tape. The O-ring in the flange groove carries the seal. Thread sealant tape or paste on the flange face destroys the seal.
• Check the O-ring before assembly. A cut, pinched or hardened O-ring must be replaced. Never assemble the flange without it.
• Do not mix Code 61 and Code 62 flanges. Code 62 (6000 psi) flanges look similar but have different dimensions. This series is Code 61 (3000 psi); never bolt it onto a Code 62 port.
• Tighten bolts in a cross pattern. Tighten the four bolts alternately to the torque value on the data sheet to keep the O-ring evenly compressed.
• Never reuse a crimped fitting. Once crimped, the ferrule zone is work-hardened. A re-crimp cannot restore the original grip.

OEM Customization and Quality Traceability

HENGHUA supplies not only standard sizes but also fully customized SAE flange fitting solutions for OEM programs.

Customization Services

• Flange and tail customization. Special flange patterns, custom tail lengths, and non-standard hose-end dimensions for your hose construction.
• O-ring elastomer selection. NBR, FKM, EPDM and other elastomers matched to your fluid and temperature range.
• Surface treatment customization. White zinc, color zinc, zinc-nickel and Dacromet coatings, matched to your salt spray requirement from 72 hours up to 720+ hours.
• Laser marking. Your logo, part number and batch code laser-marked on the flange for full traceability.
• Packaging customization. Private-label boxes, barcode labels and mixed-size kits per your BOM.

Quality Traceability

Every HENGHUA batch carries a traceable batch number. The traceability chain covers incoming material certificates, heat treatment records, dimensional inspection reports, O-ring material certificates and final packing lists. Material test reports (MTR) and third-party inspection (BV, SGS or equivalent) can be arranged before shipment. Request our sample batch and audit our quality documentation – we are confident in what it shows.

Frequently Asked Questions

What is an SAE flange fitting 3000 psi?

It is a hydraulic hose fitting with an SAE J518 Code 61 four-bolt flange head and an O-ring groove on the flange face. It connects large bore hose to standard Code 61 flange ports. The system follows ISO 6162 and ISO 12151-3.

What is the difference between Code 61 and Code 62 flanges?

Code 61 is the 3000 psi series; Code 62 is the 6000 psi series with larger dimensions for the same nominal size. This fitting is Code 61. Never bolt a Code 61 flange onto a Code 62 port.

How does the flange seal?

The O-ring in the flange face groove is compressed between the two flange faces when the four bolts are tightened. The O-ring, not the metal faces, carries the seal.

Which hose works with the 87311-RW fitting?

The 87311-RW version is designed for braided hydraulic hose such as SAE 100 R1AT, R2AT and EN 853 1SN / 2SN. For spiral-wound hose, use the 87312 series.

Do you supply stainless steel versions?

Yes. 304, 316 and 316L stainless steel versions are available for the full size range, with the same dimensions and crimp behavior.

What is the minimum order quantity?

Stock sizes start from 100 pcs. Customized versions start from 500 pcs per size. OEM annual contracts can be discussed directly with our factory team.

Get a Quote for Your SAE Flange Fitting 3000 PSI

Tell us your hose model, flange size and annual volume. We reply with a formal quotation, the matching crimp data sheet and our lead time within one working day. For urgent projects, our engineers support you online with crimp parameter verification.