JIC Female Double Hexagon Fitting: 26711D Series

Why This JIC Female Double Hexagon Fitting Passes the Compliance Gate

A JIC female double hexagon fitting terminates a braided hydraulic hose with a female UNF thread and an internal 74° cone seat, ready to receive a male JIC 37° flare stud. The 26711D series from HENGHUA is a one-piece crimp fitting built to SAE J514 (ISO 8434-2) with two hex wrenching positions on the body, covering 14 sizes from -04 to -20 with UNF threads from 7/16″-20 to 1-7/16″-12. Every unit is cold-forged from carbon steel, heat-treated, plated, and 100% pressure tested before shipment. For OEM buyers this fitting is a compliance gate; for maintenance teams it is the fitting that stays serviceable in the tightest compartments.

• SAE J514 (ISO 8434-2) JIC female end: UNF thread with an internal 74° cone seat (37° flare), sealing metal-to-metal against a male flare stud, with no O-ring and no thread sealant required.
• Double hexagon body: two hex sections at the female end give technicians a second wrenching position wherever access is tight.
• OEM gate check: full dimensional and material conformance per SAE J514, with material test reports (MTR) available for every batch.

Core Advantages

1. JIC end rated up to 34.5 MPa (5,000 psi): per SAE J514 / ISO 8434-2, with every fitting hydrostatically tested before shipment.
2. -40°C to +120°C operating range: tested across cold-start mobile equipment and hot industrial circuits without seal degradation.
3. Double hexagon access: the two hex sections are machined to the same across-flats size, so a single wrench size serves both positions and the joint can be worked from either side.
4. 96 to 1000 h salt spray options: trivalent zinc (96 h), zinc-nickel (720 h), or Dacromet (1000 h), matched to your environment.

Technical Specifications

What Is a JIC Female Double Hexagon Fitting?

A JIC female fitting is the female counterpart of the JIC male 37° flare stud: instead of a male cone, it carries a female UNF thread with an internal 74° cone seat. When a male JIC flare stud is tightened into the seat, the two cone faces contact metal-to-metal and the joint seals without O-rings, washers, or sealant. The 74° figure is the included angle of the cone, with each flank 37° from the axis, which is why JIC fittings are also called JIC 37 degree flare fittings. This connection family is the default on American-built construction equipment, agricultural machinery, trucks, and industrial machines.

The double hexagon design exists for one reason: access. Most female fittings carry a single hex, and in a crowded valve compartment there is often no room to swing a wrench around it. The 26711D series carries two hex sections at the female end, both machined to the same across-flats size. You can hold one hex and torque the male stud into the seat, or use the second hex when the first is buried behind other lines. One wrench size fits both positions, which simplifies the tool kit on service trucks and production lines.

Dimensional Data and Threads

Full dimension drawings with A, C, S1, and S2 callouts are supplied as PDF and CAD (STEP/DWG) files. Because this is a crimp fitting, the two process-critical parameters are the hose insert depth and the crimp outside diameter; both are hose-series specific and are listed in the crimp data sheet that accompanies every order.

Full Dimension Table (Part Number Matrix) {#by-thread-size}

Read the table with your JIC thread (E) and your hose size (dash). The part number is the order code; copy it directly into your inquiry or purchase order. The pattern is 26711D-[thread dash]-[hose dash]: for example, 26711D-08-08 has a 3/4″-16 thread and suits a -08 (12 mm) braided hose. The D in the series number designates the double hexagon body. If you need the same geometry for spiral hose, order the 26712D series.

The dimensions shown are for braided hose. For spiral hose use the 26712D series, whose stem is longer to engage the extra reinforcement layers.

Material and Heat Treatment

Cold forging preserves the grain flow of the steel, which raises fatigue resistance under pressure pulsation. Each heat-treatment batch is hardness-tested and recorded, so the hardness number on the MTR matches the parts you receive.

Working Pressure

The exact rating for your part number and hose combination is confirmed on the datasheet and by our engineers before shipment.

Pressure-Temperature Operating Envelope

The steel fitting body holds full rated pressure across the whole temperature window. In a crimped assembly the working pressure is governed by the weakest component, normally the hose; use the hose derating curve for the system, and the fitting will not be the limiting part.

Selection and Ordering

The 26711D series covers the full common range of JIC hydraulic hose fittings for braided hose, from -04 to -20, so most orders can be placed directly from the tables below.

How to Read the Part Number Matrix

Find your JIC thread in the E column, then the hose dash size you use. The intersecting row gives the order code, for example a 3/4″-16 thread with a -08 hose gives 26711D-08-08. If your combination is not listed, send us both sizes; a custom JIC female fitting is machined on request.

JIC Thread Size Chart

Use this chart to identify any JIC fitting by its thread and to confirm the matching hose dash sizes. It is the same mapping used in the matrix above.

Cross Reference Service

Most maintenance teams buy against a legacy part number printed on the old drawing. Send us the OEM or distributor part number you currently use, with a photo of the fitting if possible. Our engineers identify the thread, cone angle, hose size, and body configuration, then confirm the exact 26711D equivalent before you place the order. The service covers JIC 37 degree flare fittings, JIC hydraulic hose fittings, and JIC crimp fittings in your inventory, and interchange confirmation is free. The cross reference sheet is returned in PDF for your records.

Packaging and Logistics

Assembly and Use Guide

Four-Step Crimping Procedure

Crimping a JIC female fitting follows the same discipline as any JIC crimp fittings job: the crimp parameters decide everything, so never start without the data sheet.

1. Cut the hose square: use a hose cutter, never a hacksaw or an angle grinder. A square, clean end is the precondition for a uniform ferrule grip.
2. Mark the insert depth: read the insert depth for your hose series from the crimp data sheet and mark the line on the hose cover.
3. Lubricate and insert: apply a thin film of assembly lubricant to the stem and the hose bore, then push the fitting into the hose until the mark meets the ferrule.
4. Crimp and verify: select the die per the crimp table, crimp in one continuous stroke, then measure the crimp outside diameter with a caliper and compare with the tolerance.

Connecting the JIC Female End

Clean the internal 74° cone seat and the mating male 37° flare stud with a lint-free cloth. Start the male stud by hand until the cone faces touch, then tighten to the torque listed for the thread size. Use whichever of the two hex sections has clearance, and hold the other with a second wrench to take the reaction torque on stiff joints. The metal-to-metal cone does the sealing, so no tape and no sealant is applied to the cone faces. JIC 37 degree flare fittings seal by cone contact alone, which is why both faces must stay clean and dry.

Installation Warnings

• ❌ Never mix fittings and ferrules from different suppliers, even when the thread and hose sizes look identical. Stem geometry, ferrule hardness, and crimp parameters differ, and a mixed joint will leak or blow off under pressure.
• ❌ Never crimp without the matching crimp data sheet. An under-crimped joint weeps, and an over-crimped joint damages the hose reinforcement.
• ❌ Never recrimp a fitting after a failed attempt, and never reuse a fitting removed from a hose.
• ❌ Never apply sealant to the 74° cone seat or the male flare cone. It hardens, blocks metal-to-metal contact, and contaminates the circuit.
• ❌ Do not use a fixed female fitting where the hose must rotate under pressure; that requires a swivel version of the connection.
• ✔ After assembly, pressure-test the circuit at 1.5x working pressure and inspect all joints for weepage.

OEM Customization and Quality Traceability

Customization Options

• Size and thread customization: non-standard thread and hose combinations, special stem lengths, and custom hex configurations machined to your drawing.
• Surface treatment customization: trivalent zinc (96 h), zinc-nickel (720 h), or Dacromet (1000 h) salt spray grades, selected by your environment and corrosion specification.
• Laser marking: your logo, part number, and batch code laser-marked on the hex for full field traceability.
• Material options: 304/316L stainless for chemical, marine, and food-contact circuits, with passivation certificates.

Quality and Traceability System

Every batch follows a documented flow: incoming steel with mill certificate → cold forging → CNC machining → heat treatment → plating → 100% thread gauge and dimension inspection → pressure test → laser marking → packing. The batch number on the carton links back to the raw material lot, the heat-treatment record, and the inspection report. Material test reports (MTR) are provided with every order on request, and third-party inspection reports (BV/SGS) can be arranged before shipment.

FAQ

Q: What is a JIC female double hexagon fitting? A: It is a crimp-on hose fitting with a female UNF thread and an internal 74° cone seat on the port end, built to SAE J514 / ISO 8434-2. The 74° figure is the included cone angle; each flank is 37° from the axis, the same geometry as a male JIC 37° flare stud.

Q: Why does this fitting have two hexagons? A: The double hexagon gives two wrenching positions at the female end, both machined to the same across-flats size. In confined installations you use whichever hex has clearance, and a second wrench can take the reaction torque on stiff joints.

Q: When do I use a female fitting instead of a male fitting? A: Use a female fitting when the port you are connecting to is a male flare stud, which is common on pump outlets, valve ports, cylinder ends, and filter heads. Match the fitting end to the port: male ports take female fittings, and female ports take male fittings.

Q: What hose does the 26711D series fit? A: The series is designed for braided hose, typically EN 853 1SN/2SN or SAE 100R1AT/R2AT constructions from -04 to -20. For spiral hose use the 26712D series, which has a longer stem for the extra reinforcement layers.

Q: Does the female end need sealant or an O-ring? A: No. The 74° cone seat seals metal-to-metal against a male JIC 37° flare stud. Keep both cone faces clean and dry, and tighten to the listed torque. An O-ring is used only on ORFS fittings, which have a flat-face seal geometry.

Q: Can you provide crimp data for my hose? A: Yes. Every order includes the crimp data sheet for your hose construction, with insert depth, crimp outside diameter, and die selection. Correct crimp parameters are what separate reliable JIC crimp fittings from early failures, so we confirm them before shipment. Send us your hose series and brand, and our engineers will confirm the crimp parameters before shipment.

Request a Quote

Tell us the JIC thread, the hose dash size, the hose construction, and the annual quantity. Whether you need stock JIC hydraulic hose fittings for distribution or a custom JIC female double hexagon fitting for an OEM program, the quoting process is the same. For replacement orders, send the legacy part number and a photo, and our engineers will confirm the interchange before quoting. Every fitting leaves the HENGHUA factory pressure-tested, batch-coded, and backed by a written warranty. Request your quote, crimp data sheet, or drawing pack today, and we will respond within 24 hours.