1JT4-SP Adapter – 45° Elbow JIC Male 74° Cone to BSPT Male Taper Thread Cross Standard Hydraulic Adapter (SAE J514 / ISO 7-1)

The 1JT4-SP adapter is a 45° elbow cross standard adapter that turns a JIC 74° cone male end, made to SAE J514 with an inch thread, through 45 degrees into a BSPT male taper thread made to ISO 7-1. It is the elbow hydraulic adapter used where an SAE inch tube line has to reach a taper pipe port that is not in line with the tube, or where a straight body would foul another component.

Both ends must match their mating port exactly, because that match is the precondition for eliminating leakage at the conversion point. The body also has to be turned the right way: a 45° elbow only solves an interference problem when the angle is oriented to route the tube away from the obstruction, so the bend direction is part of the fit, not a detail.

Sealing principle of this series: connection 1 is a 74° external cone that seats metal-to-metal on the mating 74° internal cone, and connection 2 is a BSPT male taper thread with a 55° thread angle that seals on the threads themselves and needs a thread sealant. The elbow changes direction; it does not change either sealing method.

Principais vantagens

• Turns the line through 45 degrees while converting an SAE J514 inch cone end to a BSPT taper pipe end in one part.
• Saves the space a straight adapter plus an elbow would need at the port face.
• 74° cone end seals metal-to-metal with no sealant, while the taper pipe end seals on its threads.
• BSPT thread sizes from R1/8″x28 up to R2″x11, against JIC cone sizes from 7/16″x20 to 2.1/2″x12.
• Single body hex from 11 mm to 63 mm across flats, so the elbow can be held while the pipe end is run in.
• Carbon steel with trivalent chromium zinc plating, or 304 / 316 stainless steel for corrosive service.

1. What a 1JT4-SP Adapter Does

A 1JT4-SP adapter is a one-piece elbow with a JIC 74° cone male end on one leg and a BSPT male taper thread on the other, with 45 degrees between the two legs. It connects a tube assembly terminated with a JIC 74° cone nut and sleeve to a port threaded with a BSPT taper pipe thread, and it changes the direction of the line by 45 degrees at the same time.

This JIC adapter does two jobs in one part: it makes the thread and sealing conversion, and it makes the bend. The E column is the SAE J514 JIC 74° cone end, printed in the inch style such as 9/16"X18, and the F column is the BSPT end, printed as an R thread such as R3/8"X19.

The difference between this male adapter and its straight counterpart is geometry, not sealing. The straight version runs the line straight through, while this elbow version leaves the port at 45 degrees, which is why the size table carries an A and a B dimension but no overall L dimension: on a bent body the two legs cannot be described by a single end-to-end figure.

A 45° elbow is also the compromise between a straight part and a 90° elbow. It moves the line further from the port face than a straight adapter does, but it takes less radial space than a 90° body, which matters on manifolds with closely spaced ports.

2. 1JT4-SP Specifications

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

• Thread standard and family: SAE J514, JIC 74° cone seat family, inch thread.
• Thread size range available: 7/16″x20 to 2.1/2″x12, in the steps printed in table 2.5.
• Gender: male adapter stud end.
• Sealing method: 74° external cone seating metal-to-metal on the mating 74° internal cone.
• Mating port standard: SAE J514 74° cone seat, made up with the matching nut and sleeve for the tube.

2.2 Connection 2 – BSPT male taper thread (F)

• Thread standard and family: BSPT taper pipe thread to ISO 7-1, the family in which pressure-tight joints are made on the threads.
• Thread size range available: R1/8″x28 to R2″x11, in the steps printed in table 2.5.
• Gender: male taper thread stud end.
• Sealing method: thread interference along a 55° taper thread, assisted by a thread sealant or sealing compound; there is no separate elastomer or cone seat at this end.
• Mating port standard: a port threaded BSPT to ISO 7-1, with enough thread depth for the taper to run up to a sealing position.

Read the E column as the JIC adapter end in the SAE J514 inch thread standard and the F column as the BSPT end in the ISO 7-1 taper family. The two mirrored blocks above map one end of this elbow hydraulic adapter to the tube side and the other to the taper pipe port.

2.3 Construction and Materials

The body is machined from bar stock on CNC lathes, with the 45° bend formed in the body and both threads, the cone and the bend turned and checked in one process sequence.

• Body material: carbon steel as standard; 304 stainless steel 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 performance is confirmed per order rather than published as a series figure.
• Seal material options: this series has no captive seal. Where a seal material is required in the circuit, NBR, FKM and EPDM remain the options for the mating hose and tube assemblies.
• Bend geometry: a fixed 45° angle between the JIC leg and the BSPT leg, with the hex positioned to allow a wrench on the body.
• Hex feature: a single centre hex (S1) on the body, from 11 mm to 63 mm across flats depending on size. There is no bulkhead feature in this series.

2.4 Pressure and Temperature

Working pressure for a 1JT4-SP 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. Both ends of this series are metal joints, so those ranges apply to the seals elsewhere in the circuit and to the thread sealant used at the taper end.

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 1JT4-SP series; dimensions are in millimetres.

What each column means

• N.º DA PEÇA. – the HENGHUA part number: the prefix 1JT4, the size codes and the SP suffix that marks the BSPT taper end.
• E – the thread of connection 1, the JIC 74° cone end, printed as diameter x threads per inch in the SAE style, for example 3/4"X16.
• F – the thread of connection 2, the BSPT taper end, printed as an R thread with its threads per inch, for example R3/8"X19.
• A – the end-to-end length across the 45° body, from the JIC cone end to the pipe thread end, in millimetres, as marked on the series drawing.
• B – the length of the angled leg at connection 2, the BSPT end, in millimetres, as marked on the series drawing.
• S1 – the hex across flats, in millimetres, used to hold the body with a wrench during assembly.

This series prints no L column, because a bent body has no single straight end-to-end axis: the length of the part is read from A across the bend and from B along the angled leg.

Thread size and dash chart

The JIC size code follows the SAE convention based on the nominal tube outside diameter in sixteenths of an inch. The BSPT thread is printed directly.

Nut and sleeve are ordered separately. The 1JT4-SP stud does not include them. Use nut NB200 with sleeve NB500 for metric tube and with sleeve NB300 for inch tube.

3. How to Read a 1JT4-SP Part Number

A 1JT4-SP part number has three elements: the series prefix, one or two size codes, and the SP suffix that marks the BSPT end.

The prefix 1JT4 identifies the geometry of this cross standard adapter: a 45° elbow with a JIC 74° cone male end and a BSPT male end. The 4 records the bend, the way the same family uses 9 for a 90° body, and SP records that the pipe end is a taper thread rather than a parallel one.

The first size code is the JIC end, taken from the SAE dash convention, and the second size code is the BSPT end, taken from the R thread designation. Where one size code is printed, such as 1JT4-16SP, the row pairs that JIC size with the pipe size of matching rank; where two codes are printed, the part steps between two sizes.

Worked example: 1JT4-12-08SP.

• 1JT4 – 45° elbow, JIC 74° cone male to BSPT male.
• 12 – connection 1 is the SAE J514 size with a 1.1/16″x12 thread.
• 08 – connection 2 is the BSPT end with an R1/2″x14 taper thread.
• SP – the pipe end is a taper thread that seals on the thread.
• From the table: A is 35.5 mm across the bend, B is 30 mm along the angled leg, and S1 is 27 mm.

A buyer ordering 1JT4-12-08SP therefore receives an elbow whose JIC end takes a 1.1/16″x12 tube assembly and whose pipe end runs into an R1/2″ port, with the line turned through 45 degrees. Confirm the port thread family and the available swing space before ordering.

4. Installation and Fitment

The two ends of a 1JT4-SP adapter are prepared by different rules. The JIC end is a cone joint, tightened until the cone seats metal-to-metal with no sealant in the cone path. The BSPT end is a taper thread joint, run in until the threads interfere, with a thread sealant suited to the fluid on the male thread. HENGHUA does not print a single torque figure for this elbow hydraulic adapter, because correct tightening depends on the mating port, the tube material and the wall thickness.

Orientation: check the bend direction before the pipe end is tightened, because the 45° legs are fixed in the body and the line will sit wherever the body stops. If the angle is wrong, correct it at the tube side rather than by backing the taper thread out.

Cone seat handling: keep the 74° cone and the mating JIC seat clean and free of nicks, and replace the part if the cone has been deformed by overtightening.

Taper thread handling: check the thread for galling and burrs, apply sealant to the male thread only, and leave the first thread clear so that sealant cannot enter the circuit.

Contamination control: cap both open ends before storage, because debris carried into the cone seat or the taper thread stops the joint from bedding.

Alignment: support the tube so that its weight is not carried by the elbow, because a side load on the bend adds to the stress at both joints.

Reuse policy: a body with an undamaged cone and taper thread can be reused after cleaning; the nut and sleeve are replaced at every rebuild, and the old thread sealant is removed before the part goes back into service.

Common fitment errors and their symptoms:

• Fitting the elbow with the bend facing the wrong way. Symptom: the tube fouls a manifold or another line, and the taper joint has to be broken to correct it.
• Running a BSPT part into an NPT port. Symptom: the threads bind after a turn or two and the joint weeps along the flank.
• Using the hex to swing the body after the taper thread is tight. Symptom: a loosened taper joint and a weep at the pipe end.

Six-step assembly

1. Confirm the part number against the line list, and check the bend direction against the routing drawing.
2. Inspect the cone and the taper thread for nicks, galling and previous overtightening marks.
3. Check the port thread family and depth, and confirm it is BSPT under ISO 7-1 rather than NPT.
4. Fit the nut and sleeve to the JIC tube, then bring the tube square to the cone end by hand.
5. Apply sealant to the taper thread and run the pipe end in until it interferes, then tighten the JIC nut in stages until the cone seats.
6. Pressurise the circuit, check both ends for weeping, and re-check 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.

Cross-standard equipment integration. Machinery assembled from components of different origin often pairs an SAE inch tube line with a manifold threaded in BSPT, and the port spacing on the manifold rarely leaves room for a straight adapter plus a separate elbow. This hydraulic conversion adapter solves the thread change and the routing in one part.

Repair and replacement. Maintenance crews fit this series when a leaking taper pipe stud or a damaged inch tube end has to be renewed on site and the original line already turned through 45 degrees at that point.

High-pressure test benches. Test rigs built from pipe-threaded manifolds use the taper end at the bench side and the JIC 74° cone end at the test item side, with the 45° body keeping the tube clear of the bench frame.

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.

This hydraulic conversion adapter is a JIC adapter with an SAE J514 74° cone stud at one end, an ISO 7-1 BSPT taper thread at the other and a 45° body between them. It does not interchange with a straight adapter of the same threads, because the routing changes, and it does not interchange with a JIC 37° flare fitting, which seals on a 37° conical flare face under SAE J514. 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, measure four things.

1. Thread at the JIC end. Measure outside diameter and threads per inch. A 1.1/16″ end measures about 27 mm outside diameter with 12 threads per inch, which reads as a size 12 JIC cone end.
2. Thread at the pipe end. Measure the outside diameter at the first full thread and count the pitch. A BSPT thread has a 55° form, so a thread gauge for ISO 7-1 will seat while an NPT gauge for the same nominal size will not.
3. Bend angle and direction. Confirm the body is a 45° elbow and note which side the bend faces, because a 90° body and a mirrored body are not interchangeable in the same space.
4. Sealing surfaces on the male adapter. The cone end shows a wide machined cone; the pipe end has no separate seat, only a taper thread, which confirms that sealant is required.

Where a port is found to be parallel rather than tapered, the correct part is a cross standard adapter of the parallel thread family. Record the measurements with the part number and HENGHUA can match the replacement.

7. Ordering, Packaging and Delivery

To order, give the following information:

• Series code: 1JT4-SP.
• Full part number, for example 1JT4-16-20SP, taken from table 2.5.
• Thread sizes for the JIC end and the BSPT end, and confirmation that the port thread is tapered to ISO 7-1.
• Bend direction required, stated against the routing drawing.
• Nut and sleeve requirement for the inch tube (nut NB200 with sleeve NB300), ordered separately from the stud.
• 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. Sample orders: validation and first-article parts are available for OEM programmes, including specials outside the printed table.

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 supplier, HENGHUA can quote the stud, 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. The 1JT4-SP series is on the JIC 74° cone side of SAE J514, with a taper pipe thread at the other end.

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. The 1JT4-SP adapter is a BSPT part, so an NPT port needs a different thread family, not more sealant.

How do I identify the correct 1JT4-SP adapter size?

Measure the outside diameter and the threads per inch at the JIC end, and identify the pipe thread family and size at the other end. When the E thread and the F thread both match a printed row of table 2.5, that row is the correct part number, and the A and B dimensions then tell you whether the body fits the space.

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. This series has no captive seal, so the seal compound applies to the rest of the circuit, and the taper thread sealant must suit the same fluid.

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 and quantity, so it is confirmed with the quotation. Samples are available for OEM evaluation.

Why does this series have no L dimension?

Because the body is bent. On a 45° elbow there is no single straight end-to-end axis, so the table prints A across the bend and B along the angled leg instead of one overall length. Take both dimensions from table 2.5 when you check the fit.

Can I use a 1JT-SP straight adapter and a separate elbow instead?

You can, but each extra joint is another potential leak path on this hydraulic conversion adapter, and the assembly needs the extra length of two parts at the port. The 1JT4-SP adapter makes the same conversion and the same 45° turn in one body.

Send your requirement to HENGHUA

Send the part number, the JIC thread, the BSPT pipe size, the bend direction, the material and plating, and the quantity. HENGHUA confirms the match to the printed table, the thread family and the delivery schedule, and quotes the 1JT4-SP adapter that fits your circuit.

Related series in the same family: the 1JT-SP adapter (straight) and the 1JT9-SP adapter (90° elbow). Browse the full Hydraulic Adapters range for the complete SAE J514 JIC, NPT, ORFS and ISO 6162 flange families.