2J9 Adapter – 90° Elbow JIC Male 74° Cone to JIC Female 74° Seat Hydraulic Adapter (SAE J514)

The 2J9 adapter is a 90° elbow hydraulic adapter made to SAE J514 that carries a JIC male 74° cone on one end and a JIC female 74° seat on the other. It joins a male 74° cone stud end at connection 1 to a male 74° cone stud end at connection 2, because the female seat end receives the cone of the opposite stud.

This is the right-angle version of the male-to-female adapter family. Buyers choose it where the tube has to leave a port at 90°, or where a stud has to be extended around a corner without adding a second joint. Both ends sit in the same 74° family, yet the sealing surfaces are mirror images, and mixing them up is the most common ordering error here.

Sealing principle of this series: both joints seal metal-to-metal on a 74° cone, with no elastomer in the sealing path. The male end carries an external cone that seats on the internal cone of the mating seat, and the female end carries an internal seat that receives the cone of the opposite stud.

Core Advantages

• 90° elbow body, so a line turns a right angle in one part instead of two.
• Male 74° cone at one end and a fixed 74° female seat at the other, in one machined body.
• Reducing rows in both directions, so the male cone end can carry the smaller or the larger thread.
• Metal-to-metal 74° cone seal, with no elastomer in the joint to age or extrude.
• Carbon steel with trivalent chromium zinc plating, or 304 / 316 stainless steel for corrosive service.

1. What a 2J9 Adapter Does

A 2J9 adapter is a 90° elbow body with a JIC male 74° cone at connection 1 and a JIC female 74° seat at connection 2. It joins a male cone stud end on one side to a male cone stud end on the other, so both ends belong to the SAE J514 74° cone family and each seal is metal-to-metal.

The part changes the gender of a 74° connection and turns the line through a right angle in the same body. Equal-ended rows such as 2J9-08 present the same thread at both ends; reducing rows such as 2J9-08-10 step up a size and rows such as 2J9-10-08 step down, so the buyer can choose which side carries the larger thread as well as which side is the cone.

Why a male-to-female adapter is used. A male-to-male stud joins two female seats. Where a circuit presents a male stud that has to be extended, or where a new fixed seat has to be created in front of a stud, the male-to-female function is required, and this series provides it with a bend.

The first case is extending a stud out of a seat. A stud that sits deep in a manifold seat, or that is shorter than the space the line has to cross, cannot be reached by the tube assembly in a straight line. This adapter lands its male cone end on that existing seat and carries a new female seat out at 90°, so the tube leaves the block sideways instead of running along the stud axis.

The second case is putting a fixed female seat onto a male stud. When a line already presents a male cone stud, a second stud cannot land on it. This adapter screws its female seat end onto that stud and presents a machined 74° internal seat on the new right-angle axis, which a further tube assembly can enter. No swivel nut enters this sealing path.

How the two ends differ even though both are 74°. Both ends are made to the same 74° included angle, which is what makes them one family and lets either end seal against the standard 74° counterpart. The difference is which side of the joint each end presents. Connection 1, the E end, is a male end carrying an external 74° cone, a convex machined surface, and that cone is the sealing element. Connection 2, the F end, is a female end carrying an internal 74° seat, a concave machined surface, plus an internal thread, and that seat is what the opposite part seals against. One end seals by being the cone, the other by receiving a cone, so a part identified as “74°” on the thread alone may still be the wrong gender for the port.

2. 2J9 Specifications

2.1 Connection 1 – JIC male 74° cone end (E)

• Thread standard and family: SAE J514, JIC 74° cone seat family.
• Thread size range available: 5/16″x24 to 2.1/2″x12, in the steps printed in table 2.5.
• Gender: male stud end, with an external 74° cone.
• Sealing method: 74° external cone seating metal-to-metal on the mating internal cone.
• Mating port standard: SAE J514 74° cone seat, made up with the matching nut and sleeve.

2.2 Connection 2 – JIC female 74° seat end (F)

• Thread standard and family: SAE J514, JIC 74° cone seat family.
• Thread size range available: 5/16″x24 to 2.1/2″x12. In a reducing row this end may be the larger or the smaller thread.
• Gender: female end, with an internal 74° seat and an internal thread.
• Sealing method: 74° internal seat receiving the external cone of the opposite stud, sealing metal-to-metal.
• Mating port standard: SAE J514 male 74° cone stud end at the same nominal size.

Both connections are on the same sealing family, so the only choice is which end goes onto the existing stud or seat and which way round the two sizes are printed. The E and F columns answer both questions directly.

2.3 Construction and Materials

The body of a 2J9 adapter is machined from bar stock on CNC lathes, with the cone, the seat, the threads and both hexes turned so that the 90° leg is held to the drawing and each threaded end stays square to its own axis.

• Body material: carbon steel as standard; 304 or 316 stainless steel on request; brass for selected sizes.
• Plating and finish: trivalent chromium zinc plating (Cr3+) for carbon steel as standard; zinc-nickel plating available. Plating thickness and corrosion performance are confirmed per order.
• Seal material options: both joints here are metal-to-metal, so the adapter itself carries no elastomer. Where the same circuit uses elastomer-sealed parts, NBR, FKM and EPDM are the available compounds.
• Machining process: bar-stock turning, thread form produced to the port standard, cone, seat and leg dimension checked against the drawing with gauges.
• Hex features: a hex on each end, S1 on the male cone end and S2 on the female seat end, from 11 mm to 75 mm across flats. No bulkhead feature.

2.4 Pressure and Temperature

Working pressure for a 2J9 adapter is not set by the series code. It is governed by the thread size, the wall thickness of the elbow body, the sealing method and the material selected. Working pressure for these sizes is confirmed per order by HENGHUA engineering, based on the thread size, sealing method and material selected.

Temperature is a material fact, not a performance claim. NBR seals work at approximately -30°C to +100°C, FKM (Viton-type) at approximately -20°C to +200°C, and EPDM at approximately -40°C to +120°C; because the 74° cone joints here are metal-to-metal, these figures apply to the elastomer-sealed components of the same circuit. Carbon steel with zinc plating suits general hydraulic service; specify 304 or 316 stainless steel for corrosive duty.

2.5 Part Number and Dimension Table

The table below is the complete printed size range. Dimensions are in millimetres.

What each column means

• PART NO. – the HENGHUA part number: the prefix 2J9, then one size code for an equal-ended part or two codes for a reducing part.
• E – the thread of connection 1, the JIC male 74° cone end, printed as diameter x threads per inch, for example 3/4"X16.
• F – the thread of connection 2, the JIC female 74° seat end. When E and F match, the part is equal-ended and only the gender differs.
• A – the end-to-end length of the elbow, from the end of the male cone connection to the outer face of the female seat connection, in millimetres.
• B – the leg dimension, from the end of the male cone connection to the centre line of the female seat end, in millimetres. This is the number to compare with the space behind the port.
• S1 / S2 – the hex across flats on the male cone end and the female seat end, in millimetres.

Thread size and dash chart

The dash code is the size step, following the nominal tube outside diameter in sixteenths of an inch, so -04 is a 1/4″ tube size. The printed thread for each code is:

Nut and sleeve are ordered separately. The adapter is supplied as the body only. Use nut NB200 with sleeve NB500 for metric tube, and nut NB200 with sleeve NB300 for inch tube.

3. How to Read a 2J9 Part Number

A 2J9 part number has three elements: the series prefix, one or two size codes, and no sealing suffix.

The prefix 2J9 identifies the family: a 90° elbow JIC adapter with a male 74° cone at one end and a female 74° seat at the other. A different prefix identifies a different geometry, such as the straight version of this gender combination, its 45° elbow, a male-to-male stud, a plug, or a cross standard adapter with an NPT or BSPT thread.

The size code is the SAE dash size. One code means both ends are the same size, so the part changes gender only. Two codes mean the first is connection 1 (the E column, the male cone end) and the second is connection 2 (the F column, the female seat end). Because this series prints reducing rows in both orders, 2J9-08-10 has the smaller male cone end and 2J9-10-08 has the larger one.

Worked example: 2J9-12-10.

• 2J9 – 90° elbow JIC male 74° cone to JIC female 74° seat adapter, SAE J514.
• 12 – connection 1 is the 1.1/16″x12 male cone end.
• 10 – connection 2 is the 7/8″x14 female seat end.
• From the table: A is 44.2 mm, B is 13 mm, S1 is 27 mm and S2 is 27 mm.

A buyer ordering 2J9-12-10 receives a right-angle adapter whose male cone end lands on a 1.1/16″x12 seat, while its female end presents a smaller 7/8″x14 seat. The reverse part, 2J9-10-12, carries the same two threads the other way round, so the printed order of the codes decides which end is the larger thread.

4. Installation and Fitment

A 74° cone joint is assembled by hand first and then tightened to seat the cone. HENGHUA does not print a single torque figure for the series, because the correct tightening depends on the nut and sleeve fitted, the tube material and the wall thickness. Follow the nut supplier’s recommendation, or confirm the figure with HENGHUA engineering per order, and never use an extension bar or an impact tool.

Make up the female seat end first where its male stud is fixed to a port, because the body hex S2 can be held while that joint is set. Then bring the tube assembly to the male cone end and hold S1 while the nut is tightened; on a 90° body a tube that is already tightened cannot be rotated out of the way to reach the second joint.

Keep the cone and the internal seat clean and free of nicks. JIC 74° cone threads are not the sealing element, so do not use thread tape or sealant as a leak cure. Cap open ends before storage, because debris scores the faces and produces a seep. Bring the tube squarely to the adapter, because a right-angle body amplifies any side load. The body can be reused while both the cone and the seat are undamaged.

Common fitment errors and their symptoms:

• Landing the female seat end on a female seat. Symptom: the two internal seats face each other, so the thread will not start.
• Reading a reducing row in the wrong order. Symptom: the smaller nut starts on the larger cone end with slack, or the larger nut will not start on the smaller thread at all.
• Fitting a straight body where a right angle is needed. Symptom: the tube has to be sprung to reach the leg, and the joint weeps under vibration.

Six-step assembly

1. Confirm the part number against the line list, confirm which end in hand is the male cone, and check the order of the two size codes.
2. Inspect the cone, the internal seat and the mating surfaces for nicks, corrosion and previous overtightening marks.
3. Clean the cone, the seat and the threads with a lint-free cloth and a compatible cleaning fluid.
4. Screw the female seat end onto its male stud by hand, hold S2 with a wrench and tighten that joint in stages.
5. Fit the nut and sleeve to the tube, bring the tube square to the male cone end along the leg, then hold S1 and tighten the nut in stages.
6. Pressurise the circuit, check both joints for weeping, and re-check the tightness after the first thermal cycle.

5. Applications and Industries

Application tags for this series: hydraulic systems, water jetting, oil and gas, industrial equipment, construction machinery, agriculture, marine, material handling. The part is specified by its thread pair and gender combination rather than by industry.

Putting a fixed female seat on a male stud at a right angle. An equipment port or a welded boss can present a male 74° cone stud. The female seat end screws onto that stud and presents a new machined 74° seat on the perpendicular axis. Because the seat is machined into the elbow body rather than carried by a swivel nut, no extra swivel joint enters the sealing path.

Reducing between two JIC sizes at a corner. Because this series prints reducing rows in both orders, one elbow can step between a larger and a smaller JIC thread while turning the corner, as in 2J9-10-12 or 2J9-12-10, which removes both a separate reducer and a separate elbow from the line.

Repair, test benches and OEM lines. Maintenance crews fit a 2J9 adapter when a damaged tube end, a seized stud or a stripped seat has to be resolved on site, and a single right-angle adapter often replaces a straight adapter plus a fitting elbow, removing one joint from the leaked path. Test rigs use the same part for repeatable interfaces between the pump, the gauge line and the test article, and for production lines it is supplied to a drawing-based specification fixed per programme.

6. Replacement and Cross-Reference Guide

Cross-reference for this series is organised by standard and sealing method, never by brand. Two adapters interchange only if the standard, thread size, seat angle, gender at each end, body angle and seal type all match.

This 2J9 adapter is a SAE J514 90° elbow adapter with a male 74° cone at connection 1 and a female 74° seat at connection 2. It is not interchangeable with a JIC 37° flare fitting: a 37° flare seals on the conical flare face while a 74° cone seals on the wide cone face, and the two seats will not mate. It is also not interchangeable with an ORFS fitting under SAE J1453, with an SAE O-ring boss stud end under SAE J1926-3, or with an NPT fitting, which seals on the thread flanks under ANSI/ASME B1.20.1 and needs a sealant.

To identify the correct replacement, measure three things.

1. Thread. Measure the outside diameter and the pitch on both ends, and note which end has the external thread and which has the internal thread. A 3/4″ end measures about 19.0 mm outside diameter with 16 threads per inch; a 1.1/16″ end about 27.0 mm with 12 threads per inch. Record all three together.
2. Seat angle. Use a seat angle gauge or a straight edge against the cone or the seat. A 74° cone is wide and shallow; a 37° flare is narrower and steeper. If the angles differ, the parts do not interchange regardless of thread match.
3. Gender, body angle and seal type. Confirm whether each end is a male cone or a female seat, what the joint seals on, and what the leg dimension is. A 74° cone joint has no O-ring in its sealing path, and a straight, 45° or 90° body is not interchangeable in a fixed routing even when the threads match.

Where the port standard is not SAE J514, a cross standard adapter of the same size is the correct part. Record the three measurements with the part number, and HENGHUA can match the replacement to the series and size code in table 2.5.

7. Ordering, Packaging and Delivery

To order, give the following information:

• Series code: 2J9.
• Full part number, for example 2J9-12-10, taken from table 2.5.
• Thread sizes for connection 1 and connection 2, read from the E and F columns in that order, and state which end must be the male cone and which the female seat.
• Required leg orientation, because the 90° body can be supplied for a specific routing direction on OEM programmes.
• Nut and sleeve requirement, including the tube standard (metric tube uses nut NB200 with sleeve NB500; inch tube uses nut NB200 with sleeve NB300), because these are ordered separately.
• Seal material for the elastomer-sealed components in the circuit: NBR, FKM or EPDM.
• Body material and plating: carbon steel with Cr3+ zinc plating, zinc-nickel plating, or 304 / 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 quantity.

Sample orders and first-article parts are available for OEM programmes, including specials such as a reducing row in the opposite order. Lead time is confirmed per order, because it depends on the size, the material, the plating and the quantity. As a hydraulic adapter manufacturer and hydraulic adapter supplier, HENGHUA can quote the 2J9 adapter, the nut and the sleeve 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, because the two are not interchangeable; the 2J9 series is on the JIC 74° cone side, so confirm the seat angle first.

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, angle and pitch differ, so the two will not seal even though some sizes start by hand. Order a cross standard adapter when the two sides differ.

How do I identify the correct 2J9 size?

Measure the thread outside diameter and the pitch on both mating interfaces, note the gender of each, and check the leg dimension against the space available. Read across the E and F columns of table 2.5, and when thread, seat angle, gender and body angle all match a printed row, that row is the correct part number.

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 and water-glycol, EPDM is the option, at approximately -40°C to +120°C. Both joints here are metal-to-metal, so the seal material applies to the elastomer-sealed parts of 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 of the elbow body and the tube, the sealing method and the material selected, and is confirmed per order by HENGHUA engineering against the intended circuit.

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

Minimum order quantity depends on the size code, the material and the plating, so it is confirmed with the quotation rather than published as one series figure. Samples and validation parts are available for OEM and distributor evaluation, including specials made to a drawing.

Which end of a reducing 2J9 is the larger thread?

The first size code is always connection 1, the male 74° cone end, and the second is connection 2, the female 74° seat end. So 2J9-10-12 has the smaller male cone end and the larger female seat, while 2J9-12-10 is the reverse. The two are different parts, so state the required order in the inquiry.

Send your requirement to HENGHUA

Send the part number, the two thread sizes in the order you need them, the required gender at each end, the leg orientation, the material and plating, and the quantity. HENGHUA confirms the match to the printed table, the seal and material options and the delivery schedule, and quotes the 2J9 adapter that fits your circuit.

Related series in the same family: the 2J adapter (straight) and the 2J4 adapter (45° elbow). Browse the full Hydraulic Adapters range for the complete SAE J514 JIC, NPT, ORFS and ISO 6162 flange families.