AJ6JJ Adapter – JIC Male 74° Cone Bulkhead Branch Tee Adapter (SAE J514)

The AJ6JJ adapter is a bulkhead branch tee adapter with three JIC 74° cone male ports made to SAE J514. The body is designed to pass through a panel: the run sits on one side of the panel, the branch stem passes through the panel cutout, and a bulkhead lock nut holds the whole tee against the panel face.

Both ends must match their mating port exactly, because that match is the precondition for eliminating leakage at the conversion point. On this series there are three mating ports instead of two, and the body has a fourth interface as well, the panel joint, which is mechanical rather than fluid-carrying and must still be tightened and oriented correctly.

Sealing principle of this series: all three ports, E, F and G, are 74° external cones that seat metal-to-metal on the mating 74° internal cone, so no port of this tee uses an elastomer or a thread sealant. The bulkhead joint carries no fluid at all; it uses a lock nut to clamp the body to the panel, so that the tee stays square and does not rotate when the tube assemblies are tightened on either side.

Core Advantages

• One body makes a branch take-off and a panel pass-through, so a tube line can leave a panel through a single part.
• Three JIC 74° cone ports, all with the same thread size per part number, so one tube assembly specification covers the tee.
• The A and C run lengths are equal in every printed row, so the run is symmetric about the branch.
• Bulkhead lock nut available with the part, ordered by adding the LN suffix to the part number.
• Hex S1 on the body and a separate lock nut hex S2, so the body can be held while the lock nut is tightened against the panel.
• Carbon steel with trivalent chromium zinc plating; 304 or 316 stainless steel available for corrosive service.

1. What an AJ6JJ Adapter Does

An AJ6JJ adapter is a three-port tee whose branch leg passes through a panel and is locked by a bulkhead nut. It takes one fluid line in, sends it out in line with the run, and takes a third connection off at right angles to the run, through the panel.

This JIC adapter therefore has three ports and their columns, plus the panel joint:

• E is one end of the run, a JIC 74° cone male port.
• F is the other end of the run, a JIC 74° cone male port, directly opposite E.
• G is the branch port, a JIC 74° cone male port on the end of the bulkhead stem that passes through the panel.
• The bulkhead lock nut is the panel joint. It is not a fluid port; it clamps the stem to the panel and is printed as hex S2.

Run versus branch geometry matters on this series more than on a plain tee, because the run and the branch are not interchangeable in installation. The run is the straight axis through E and F, and it is the axis the panel sits square to. The branch is the perpendicular axis from the run centre line out through the panel to G. Fluid can flow in any direction through the tee; the geometry only describes where each port points.

2. AJ6JJ Specifications

2.1 Connection 1 – JIC 74° cone male run ends (E and F)

• Thread standard and family: SAE J514, JIC 74° cone seat family, inch thread.
• Thread size range available: 7/16″x20 to 1.5/16″x12, in the steps printed in table 2.5.
• Gender: male adapter stud ends.
• Sealing method: 74° external cone seating metal-to-metal on the mating 74° internal cone at both ends of the run.
• Mating port standard: SAE J514 74° cone seat, made up with the matching nut and sleeve for each tube.
• Columns: E is the thread of the first run port and F is the thread of the second run port, directly opposite E on the same axis; both columns print the same thread in every row.

2.2 Connection 2 – JIC 74° cone male branch end (G) on the bulkhead stem

• Thread standard and family: SAE J514, JIC 74° cone seat family, inch thread, on the end of the bulkhead stem.
• Thread size range available: 7/16″x20 to 1.5/16″x12, matching the run ports in every printed row, printed in column G.
• Gender: male adapter stud end.
• Sealing method: 74° external cone seating metal-to-metal on the mating 74° internal cone, on the far side of the panel.
• Mating port standard: SAE J514 74° cone seat, made up with the matching nut and sleeve for the tube.
• Panel joint: the stem passes through the panel cutout and is clamped by the bulkhead lock nut, whose hex is printed as S2 and which is ordered by adding the LN suffix to the part number.

2.3 Construction and Materials

The body is machined from bar stock on CNC lathes. The run, the branch stem, the three 74° cones and the lock nut thread are turned and checked so that the branch stays square to the run axis.

• Body material: carbon steel as standard; 304 stainless steel or 316 stainless steel on request.
• Plating and finish: trivalent chromium zinc plating (Cr3+) for carbon steel as standard; zinc-nickel plating available. Plating performance is confirmed per order rather than published as a series figure.
• Seal material options: none in the tee itself, because all three ports are metal cone joints. Where a seal material is required in the circuit, NBR, FKM and EPDM remain the options for the mating hose and tube assemblies.
• Bulkhead features: the branch leg is the bulkhead stem, with the lock nut thread and the body shoulder that seats against the panel; the lock nut takes the wrench at hex S2.
• Hex features: the body hex S1, from 11 mm to 33 mm across flats, and the lock nut hex S2, from 17 mm to 41 mm across flats, both printed row by row in table 2.5.

2.4 Pressure and Temperature

Working pressure for an AJ6JJ adapter is not set by the series code. It is governed by the thread size, the wall thickness of the body and the tube, the sealing method and the material selected, and is confirmed per order by HENGHUA engineering.

Temperature is a material question and is stated here as a material fact rather than a performance claim. For NBR seals the working range is approximately -30°C to +100°C, for FKM (Viton-type) approximately -20°C to +200°C, and for EPDM approximately -40°C to +120°C. All three ports of this bulkhead adapter are metal cone joints, so those ranges apply to the seals elsewhere in the circuit and to any gasket used at the panel.

Carbon steel with zinc plating suits general hydraulic service; specify 304 or 316 stainless steel for corrosive or offshore service.

2.5 Part Number and Dimension Table

The table below is the complete printed size range of the AJ6JJ series; dimensions are in millimetres.

What each column means

• PART NO. – the HENGHUA part number: the prefix AJ6JJ plus the size code. Adding LN after the size code, for example AJ6JJ-12LN, orders the adapter with its bulkhead lock nut.
• E – the thread of the first run port, a JIC 74° cone male end, printed as diameter x threads per inch in the SAE style, for example 9/16"X18.
• F – the thread of the second run port, opposite E on the same axis, printed in the same style.
• G – the thread of the branch port on the end of the bulkhead stem, printed in the same style.
• A – the run length from the E end face to the centre of the branch, in millimetres, as marked on the series drawing.
• B – the branch height, from the run centre line out to the G end face, in millimetres. It includes the bulkhead stem that passes through the panel, which is why B is larger than A or C in every printed row.
• C – the run length from the F end face to the centre of the branch, in millimetres. A and C are equal in every printed row, so the run is symmetric.
• S1 – the hex across flats of the tee body, in millimetres, used to hold the body when the tube nuts and the lock nut are tightened.
• S2 – the hex across flats of the bulkhead lock nut on the branch stem, in millimetres, used to tighten the body against the panel.

Thread size and dash chart

Every row of this series is a single-size tee: the three ports print the same JIC thread, and the part number carries one size code rather than two.

Nut and sleeve are ordered separately. The AJ6JJ tee does not include them, and each of the three cone ends needs its own nut and sleeve for the tube it carries. Use nut NB200 with sleeve NB500 for metric tube and with sleeve NB300 for inch tube. The bulkhead lock nut is ordered with the tee by adding the LN suffix.

3. How to Read an AJ6JJ Part Number

An AJ6JJ part number has two elements, plus the optional lock nut suffix: the series prefix and one size code.

The prefix AJ6JJ identifies the geometry of this bulkhead adapter: a branch tee with three JIC 74° cone male ports, where the branch leg is a bulkhead stem. The three J letters record that all three ports are JIC cone ends, which is why the table prints the same thread three times per row.

The size code is the only variable: 04 through 16, taken from the SAE dash convention based on the nominal tube outside diameter in sixteenths of an inch. There is no second size code on this series, because the printed range is single-size only, so a stepped tee is not part of the standard range.

Worked example: AJ6JJ-08.

• AJ6JJ – JIC 74° cone bulkhead branch tee.
• 08 – the size code for a 3/4″x16 thread, printed on all three ports.
• From the table: A is 32 mm, B is 53.5 mm, C is 32 mm, S1 is 19 mm and S2 is 24 mm.
• Ordering it as AJ6JJ-08LN adds the bulkhead lock nut with a 24 mm hex across flats.

A buyer ordering AJ6JJ-08 therefore receives a tee whose run takes two 3/4″x16 tube assemblies and whose branch carries the same thread through the panel. Check the panel thickness and the amount of stem available beyond the lock nut before ordering, because the panel sits between the body shoulder and the lock nut.

4. Installation and Fitment

This bulkhead adapter has three fluid joints and one mechanical joint. The three cone ends are tightened until the cones seat metal-to-metal with no sealant in the cone path. The panel joint is tightened with the lock nut at hex S2 until the body is clamped square to the panel. HENGHUA does not print a single torque figure for this hydraulic adapter, because correct tightening depends on the mating ports, the tube material and the wall thickness.

Mounting sequence: fit the body through the panel cutout first, bring the body square to the panel, then run the lock nut down and tighten it against the panel. Until the lock nut is tight, the body can rotate, so the run orientation has to be set before the tube ends are made up.

Orientation: the branch passes through the panel and the run lies on the other side. Set the run so that both run ports are accessible with a wrench, because a run port that ends up against the panel face cannot be serviced.

Cone seat handling: keep all three 74° cones and their mating seats clean and free of nicks, and replace the tee if a cone has been deformed by overtightening.

Panel joint: check that the panel face is flat where the body shoulder beds, because a body held off square loads the stem and the lock nut unevenly. Confirm the cutout and the panel thickness against the drawing before assembly.

Contamination control: cap all three open ports before storage, because debris on a cone seat stops the joint from bedding.

Reuse policy: a body with undamaged cones can be reused; the lock nut can be reused if its thread is clean, the tube nuts and sleeves are replaced at every rebuild, and any panel gasket is renewed.

Common fitment errors and their symptoms:

• Tightening the tube ends before the lock nut. Symptom: the body rotates in the panel and both run joints lose their alignment.
• A panel cutout that is too large. Symptom: the body shifts under load and the lock nut cannot clamp it square.
• Overtightening a cone to stop a weep. Symptom: a deformed cone and a leak that returns at the next pressure cycle.

Six-step assembly

1. Confirm the part number against the line list, and check whether the lock nut is included by looking for the LN suffix.
2. Inspect the three cones, the stem thread and the body shoulder for nicks, corrosion and previous overtightening marks.
3. Fit the body through the panel cutout, seat the body shoulder on the panel face and set the run orientation.
4. Run the lock nut down the stem by hand, then tighten it at hex S2 with the body held at hex S1 until the tee is clamped square.
5. Fit a nut and sleeve to each of the three tubes, then make up the three cone joints in stages until each cone seats.
6. Pressurise the circuit, check all three ports and the panel joint, and re-check tightness after the first thermal cycle.

5. Applications and Industries

Application tags for the AJ6JJ adapter: hydraulic systems, water jetting, oil and gas, industrial equipment, construction machinery, agriculture, marine, material handling.

Control panels and bulkhead routing. Hydraulic lines that cross from one side of a panel or cabinet to the other need a defined pass-through point, and this bulkhead adapter provides it while branching the line on the far side. The panel joint carries the mechanical load of the tube weight, so the cone joints are not loaded by the pass-through.

Distributor blocks and OEM assemblies. This hydraulic adapter gives a run and a branch in one body, which is useful where a pressure line has to feed a second function without a separate manifold port. On production lines it is supplied to a drawing-based specification with material, plating and the lock nut requirement fixed per programme.

Repair and replacement. Maintenance crews fit this series when a tee on a panel-mounted machine is damaged and the tube ends have to be re-made without disturbing the panel. Because the lock nut holds the body, the tube ends can be broken and remade without the tee dropping back through the cutout.

6. Replacement and Cross-Reference Guide

Cross-reference here is organised by standard and sealing method, never by brand: two fittings interchange only if standard, thread size, seat angle, seal type and geometry all match.

An AJ6JJ adapter is a JIC adapter with three SAE J514 74° cone male ends, one of which is a bulkhead stem with a lock nut. It does not interchange with a plain tee of the same threads, because that has no bulkhead stem, and it does not interchange with a JIC 37° flare fitting, which seals on a 37° conical flare face. It also does not interchange with an ORFS fitting, which seals a flat face against an O-ring under SAE J1453.

To identify the correct replacement for an AJ6JJ adapter, measure four things.

1. Thread at all three ports. This series prints the same thread on E, F and G, so measure one port and confirm the other two match. A 3/4″ end measures about 19.1 mm outside diameter with 16 threads per inch, which reads as a size 08 port.
2. Run and branch dimensions. Measure A and C from each run end face to the branch centre line, and B from the run centre line to the branch end face. If B is close to A, the part is a plain tee rather than a bulkhead tee.
3. Bulkhead features. Confirm the presence of the stem thread and the lock nut, and note the lock nut hex across flats against the S2 column.
4. Sealing surfaces. All three ports should show a wide machined cone and no O-ring groove, which confirms a JIC 74° cone joint at every port.

Where a port is a different thread family, or where the branch has to be a female port rather than a male cone end, the correct part is a different member of the tee family, so check the sealing method before ordering another JIC adapter. Record the measurements from the male adapter with the part number and HENGHUA can match the replacement, including the lock nut.

7. Ordering, Packaging and Delivery

To order, give the following information:

• Series code: AJ6JJ.
• Full part number, for example AJ6JJ-16, taken from table 2.5.
• Whether the bulkhead lock nut is required, by adding the LN suffix, for example AJ6JJ-16LN.
• Confirmation that all three ports are to be the printed size, since this series is single-size.
• Nut and sleeve requirement for the tubes (nut NB200 with sleeve NB300 for inch tube, or with sleeve NB500 for metric tube), ordered separately from the AJ6JJ adapter.
• Body material and plating: carbon steel with trivalent chromium zinc plating, zinc-nickel plating, or 304 or 316 stainless steel.
• Quantity, and the destination and packing format required.

Packaging formats: bulk cartons for line-side consumption, small boxes for distributor shelves and labelled bags for service kits, each labelled with the part number and the lock nut suffix where applicable. Sample orders: validation and first-article parts are available for OEM programmes.

Lead time is confirmed per order, because it depends on the size, the material, the plating, the lock nut requirement and the quantity. As a hydraulic adapter manufacturer and supplier, HENGHUA can quote the tee, the lock nut, the nuts and the sleeves as one matched kit.

8. FAQ

What is the difference between JIC 37° flare and ORFS, and which should I use?

A JIC 37° flare joint seals metal-to-metal on a 37° conical flare face under SAE J514. An ORFS joint seals a flat face against an elastomeric O-ring under SAE J1453. Choose the family that matches the port already on the equipment. The AJ6JJ adapter is on the JIC 74° cone side of SAE J514 at all three ports.

Can NPT and BSPT be interchanged?

No. NPT is a 60° taper pipe thread under ANSI/ASME B1.20.1, and BSPT is a 55° taper pipe thread under ISO 7-1. The thread form, the angle and the pitch differ, so the two will not seal even though some sizes start by hand. No port of this tee is a pipe thread; all three are straight-thread JIC cone ends.

How do I identify the correct AJ6JJ size?

Measure the thread outside diameter and the threads per inch at any one port, because all three ports of a printed row carry the same thread, then read across the E, F and G columns of table 2.5. Confirm the row a second time by checking the A and B dimensions against the space available at the panel.

What seal material should I select for my fluid and temperature?

For general mineral hydraulic oil within -30°C to +100°C, NBR is the usual choice. For higher temperatures up to approximately +200°C, or where the fluid attacks NBR, choose FKM (Viton-type). For water-based fluids, choose EPDM, with a range of approximately -40°C to +120°C. The tee has no captive seal, so the choice applies to the other seals in the circuit.

How is the working pressure of this adapter determined?

Working pressure is not fixed by the series code. It is governed by the thread size, the wall thickness and the material selected, and is confirmed per order by HENGHUA engineering.

What is the minimum order quantity and can I get samples?

Minimum order quantity depends on the size code, material, plating, lock nut requirement and quantity, so it is confirmed with the quotation. Samples are available for OEM evaluation.

What is the difference between S1 and S2 on this series?

S1 is the hex across flats of the tee body, and S2 is the hex across flats of the bulkhead lock nut. Hold the body at S1 and tighten the lock nut at S2 when clamping the tee to the panel, then hold the body at S1 while the three tube nuts are tightened. Both hex figures are printed for every row in table 2.5.

Which port is the run and which is the branch?

E and F are the two ends of the run, on the same axis and directly opposite each other, and A and C are the run lengths to those ends. G is the branch, set at right angles to the run on the end of the bulkhead stem, and B is the branch height from the run centre line to the G end face. Because the stem passes through the panel, B is larger than A and C in every printed row.

Send your requirement to HENGHUA

Send the part number, whether the LN lock nut is wanted, the material and plating, and the quantity. HENGHUA confirms the match to the printed table, the panel features and the delivery schedule, and quotes the AJ6JJ adapter that fits your circuit.

Related series in the same family: the AJ adapter (tee) and the 6J adapter (bulkhead). Browse the full Hydraulic Adapters range for the complete SAE J514 JIC, NPT, ORFS and ISO 6162 flange families.