JIC and ORB Dash Size Chart — -2 to -32
JIC 37° (SAE J514), AN and SAE ORB fittings of the same dash size have the same straight UNF or UN thread; the dash number is the tube outside diameter in sixteenths of an inch, so -8 is 8/16 = 1/2 in tube with a 3/4-16 thread. EKINSUN LTD is a custom parts manufacturer that machines JIC, AN and ORB adapters to NPT, BSPP, metric or ORFS from 1 piece, and supplies standard sizes from stock as well.
| Dash | Tube OD (in / mm) | Thread (JIC, AN, ORB) | Thread OD | TPI (pitch) | ORB O-ring (AS568) | NPT, same nominal size |
|---|---|---|---|---|---|---|
| -2 | 1/8 in / 3.18 mm | 5/16-24 UNF | 7.94 mm | 24 (1.058 mm) | 902 | 1/8 NPT (27 TPI) |
| -3 | 3/16 in / 4.76 mm | 3/8-24 UNF | 9.53 mm | 24 (1.058 mm) | 903 | none — name the other end |
| -4 | 1/4 in / 6.35 mm | 7/16-20 UNF | 11.11 mm | 20 (1.270 mm) | 904 | 1/4 NPT (18 TPI) |
| -5 | 5/16 in / 7.94 mm | 1/2-20 UNF | 12.70 mm | 20 (1.270 mm) | 905 | none — name the other end |
| -6 | 3/8 in / 9.53 mm | 9/16-18 UNF | 14.29 mm | 18 (1.411 mm) | 906 | 3/8 NPT (18 TPI) |
| -8 | 1/2 in / 12.70 mm | 3/4-16 UNF | 19.05 mm | 16 (1.588 mm) | 908 | 1/2 NPT (14 TPI) |
| -10 | 5/8 in / 15.88 mm | 7/8-14 UNF | 22.23 mm | 14 (1.814 mm) | 910 | none — name the other end |
| -12 | 3/4 in / 19.05 mm | 1-1/16-12 UN | 26.99 mm | 12 (2.117 mm) | 912 | 3/4 NPT (14 TPI) |
| -14 | 7/8 in / 22.23 mm | 1-3/16-12 UN | 30.16 mm | 12 (2.117 mm) | 914 | none — name the other end |
| -16 | 1 in / 25.40 mm | 1-5/16-12 UN | 33.34 mm | 12 (2.117 mm) | 916 | 1 NPT (11.5 TPI) |
| -20 | 1-1/4 in / 31.75 mm | 1-5/8-12 UN | 41.28 mm | 12 (2.117 mm) | 920 | 1-1/4 NPT (11.5 TPI) |
| -24 | 1-1/2 in / 38.10 mm | 1-7/8-12 UN | 47.63 mm | 12 (2.117 mm) | 924 | 1-1/2 NPT (11.5 TPI) |
| -32 | 2 in / 50.80 mm | 2-1/2-12 UN | 63.50 mm | 12 (2.117 mm) | 932 | 2 NPT (11.5 TPI) |
Buying adapters in these sizes? Standard JIC, AN and ORB adapters (for example -6 JIC male × 3/8 NPT male, -8 ORB × -8 JIC) can also be supplied from stock; any other pair is machined to order from 1 piece. The more pieces you order, the lower the unit price. Name both ends, the material and the quantity; quote in 12 hours.
Threads per SAE J514 (JIC) and SAE J1926-1 (ORB port); AN fittings use the same threads. Thread OD is the nominal size in millimetres; a caliper across a used or plated thread reads a little less. -3, -5, -10 and -14 have no NPT of the same nominal size. ORFS (O-ring face seal, SAE J1453) uses different threads for the same dash size: see the fitting thread identification chart.
JIC, AN, ORB and 45° Flare — Same Thread, Different Seal
The thread holds the joint together; the seal is somewhere else, and that is what decides which parts work together. A JIC and an AN fitting of the same dash size mate and seal. A JIC male end threads into an ORB port of the same size but does not seal there, and in some sizes a 45° flare nut threads onto a 37° JIC cone and still leaks.
| Connection | Standard | Seals on | Mates with |
|---|---|---|---|
| JIC 37° flare | SAE J514 | A 37° cone at the nose, metal to metal; the thread only holds the nut | AN of the same dash size |
| AN | Military (aerospace) specifications | The same 37° cone and the same thread as JIC, made and inspected to tighter tolerances | JIC of the same dash size |
| SAE ORB (O-ring boss) | SAE J1926-1 / ISO 11926-1 port | An O-ring at the base of the male thread, squeezed into a chamfer at the mouth of the port | An ORB port only: a JIC end has the same thread but no seal there |
| 45° SAE flare | SAE (automotive, refrigeration) | A 45° cone | Other 45° flares only: some sizes share the JIC thread, but a 37° and a 45° seat do not seal together |
How to Identify a JIC or ORB Fitting
Measure the thread outside diameter with a caliper, count the threads per inch with a pitch gauge, then look at the end: a cone at the nose is a JIC or AN flare (check 37° against 45° with a seat-angle gauge), an O-ring at the base of a straight thread is ORB, an O-ring in a flat face is ORFS, and a thread that gets smaller towards the end is NPT or BSPT. Match the diameter and the thread count to the chart. The diameter alone is not enough: several JIC and ORB threads are within about a millimetre of an NPT or BSPP thread.
| JIC / ORB thread | Look-alike thread | How to tell them apart |
|---|---|---|
| -3 JIC / ORB: 3/8-24 UNF, 9.53 mm, 24 TPI, straight | 1/8 NPT: 10.29 mm, 27 TPI, tapered 1:16, 60° | count the threads: 24 against 27 per inch, and the taper |
| -3 JIC / ORB: 3/8-24 UNF, 9.53 mm, 24 TPI, straight | G 1/8 (BSPP): 9.73 mm, 28 TPI, parallel, 55° | count the threads: 24 against 28 per inch |
| -4 JIC / ORB: 7/16-20 UNF, 11.11 mm, 20 TPI, straight | 1/8 NPT: 10.29 mm, 27 TPI, tapered 1:16, 60° | count the threads: 20 against 27 per inch, and the taper |
| -5 JIC / ORB: 1/2-20 UNF, 12.70 mm, 20 TPI, straight | 1/4 NPT: 13.72 mm, 18 TPI, tapered 1:16, 60° | count the threads: 20 against 18 per inch, and the taper |
| -5 JIC / ORB: 1/2-20 UNF, 12.70 mm, 20 TPI, straight | G 1/4 (BSPP): 13.16 mm, 19 TPI, parallel, 55° | count the threads: 20 against 19 per inch |
| -6 JIC / ORB: 9/16-18 UNF, 14.29 mm, 18 TPI, straight | 1/4 NPT: 13.72 mm, 18 TPI, tapered 1:16, 60° | same 18 TPI: go by the diameter, 14.29 against 13.72 mm, and the taper |
| -10 JIC / ORB: 7/8-14 UNF, 22.23 mm, 14 TPI, straight | 1/2 NPT: 21.34 mm, 14 TPI, tapered 1:16, 60° | same 14 TPI: go by the diameter, 22.23 against 21.34 mm, and the taper |
| -10 JIC / ORB: 7/8-14 UNF, 22.23 mm, 14 TPI, straight | G 5/8 (BSPP): 22.91 mm, 14 TPI, parallel, 55° | same 14 TPI: go by the diameter, 22.23 against 22.91 mm, and the 55° thread angle |
| -12 JIC / ORB: 1-1/16-12 UN, 26.99 mm, 12 TPI, straight | 3/4 NPT: 26.67 mm, 14 TPI, tapered 1:16, 60° | count the threads: 12 against 14 per inch, and the taper |
| -12 JIC / ORB: 1-1/16-12 UN, 26.99 mm, 12 TPI, straight | G 3/4 (BSPP): 26.44 mm, 14 TPI, parallel, 55° | count the threads: 12 against 14 per inch |
| -14 JIC / ORB: 1-3/16-12 UN, 30.16 mm, 12 TPI, straight | G 7/8 (BSPP): 30.20 mm, 14 TPI, parallel, 55° | count the threads: 12 against 14 per inch |
| -16 JIC / ORB: 1-5/16-12 UN, 33.34 mm, 12 TPI, straight | 1 NPT: 33.40 mm, 11.5 TPI, tapered 1:16, 60° | count the threads: 12 against 11.5 per inch, and the taper |
| -16 JIC / ORB: 1-5/16-12 UN, 33.34 mm, 12 TPI, straight | G 1 (BSPP): 33.25 mm, 11 TPI, parallel, 55° | count the threads: 12 against 11 per inch |
| -20 JIC / ORB: 1-5/8-12 UN, 41.28 mm, 12 TPI, straight | 1-1/4 NPT: 42.16 mm, 11.5 TPI, tapered 1:16, 60° | count the threads: 12 against 11.5 per inch, and the taper |
| -20 JIC / ORB: 1-5/8-12 UN, 41.28 mm, 12 TPI, straight | G 1-1/4 (BSPP): 41.91 mm, 11 TPI, parallel, 55° | count the threads: 12 against 11 per inch |
| -24 JIC / ORB: 1-7/8-12 UN, 47.63 mm, 12 TPI, straight | 1-1/2 NPT: 48.26 mm, 11.5 TPI, tapered 1:16, 60° | count the threads: 12 against 11.5 per inch, and the taper |
| -24 JIC / ORB: 1-7/8-12 UN, 47.63 mm, 12 TPI, straight | G 1-1/2 (BSPP): 47.80 mm, 11 TPI, parallel, 55° | count the threads: 12 against 11 per inch |
JIC and ORB Adapters by Dash Size — to NPT, BSPP and Metric
An adapter joins a JIC or ORB end to another standard, another dash size or another shape. We make straight adapters, 90° and 45° elbows, tees and bulkheads in zinc-plated carbon steel, 316L (1.4404) or 304 (1.4301) stainless and brass CW614N, and 6061 aluminium for low-pressure fuel and oil lines. Tell us the working pressure and we choose the material and wall to suit.
| Adapter | Example | How we supply it |
|---|---|---|
| JIC 37° male × NPT male | -6 JIC × 3/8 NPT, -8 JIC × 1/2 NPT | Standard pair: also from stock, or machined from 1 piece |
| ORB male × JIC male | -8 ORB × -8 JIC, -6 ORB × -4 JIC | Standard pair: also from stock, or machined from 1 piece |
| ORB male × NPT female | -6 ORB × 1/4 NPT | Standard pair: also from stock, or machined from 1 piece |
| JIC female swivel × NPT or JIC male | -6 JIC swivel × 3/8 NPT | Standard pair: also from stock, or machined from 1 piece |
| JIC reducer or expander | -8 JIC female × -6 JIC male | Standard pair: also from stock, or machined from 1 piece |
| JIC or ORB × BSPP (G) | -8 JIC × G 1/2, -6 ORB × G 1/4 | Machined to order from 1 piece |
| JIC or ORB × metric port | -6 JIC × M14 × 1.5, -8 JIC × M18 × 1.5 | Machined to order from 1 piece |
| JIC × ORFS | -8 JIC × -8 ORFS | Machined to order from 1 piece |
| -3, -5 or -14 on either end | -5 JIC × 1/4 NPT | Machined to order from 1 piece |
| Any of these in 316 stainless or brass | -8 ORB × -8 JIC in 316L | Machined from 1 piece; standard sizes also from stock |
Price for a pair: tap its row above, or send both ends. Standard pairs can also be supplied from stock; the more pieces, the lower the unit price.
Pairs between two pipe or metric threads are on BSP to NPT adapters (17 NPT × BSP and BSP × metric pairs are in stock) and metric to imperial thread adapters; bored-out, long-body and obsolete hydraulic fittings on hydraulic adapters.
From Stock or Made to Order
Standard JIC, AN and ORB adapters are catalogue parts. We supply them too, and for one piece needed today a local hose shop is quicker. Pairs, sizes and materials the catalogue does not carry are machined to order from 1 piece.
| What you need | On the shelf? | What we do |
|---|---|---|
| A standard JIC, AN or ORB adapter in plated steel — -4 JIC × 1/4 NPT, -6 JIC × 3/8 NPT, -8 ORB × -8 JIC | Yes — hydraulic hose shops and industrial supply stores | Buy it from stock — from us (standard sizes can be supplied from stock; the more pieces, the lower the unit price) or, for one piece today, at a local hydraulic hose shop. |
| The same adapter in 316 stainless | Partly | Machined in 316L (1.4404) from 1 piece; standard sizes can also be supplied from stock. |
| JIC or ORB on one end, BSPP (G) or a metric port on the other | Rarely | Machined from hex bar: the 37° cone or the ORB boss on one end, the G or metric thread on the other, from 1 piece. |
| -3, -5 or -14, which have no NPT of the same nominal size | Rarely | Made to order; name the other end. |
| A longer body, a bulkhead, a larger bore or a test point | No | Body length and bore cut to your drawing; see hydraulic adapters. |
| An unmarked or obsolete fitting | No | Measured from the part you send: thread, seat angle, bore and hex. |
Thread by Dash Size — Quick Answers
What thread is a -4 JIC or ORB fitting?
A -4 JIC, AN or SAE ORB fitting has a 7/16-20 UNF thread, 11.11 mm across the crests with 20 threads per inch, and fits 1/4 in (6.35 mm) tube; the ORB O-ring is AS568-904. The NPT of the same nominal size is 1/4 NPT (18 TPI).
What thread is a -6 JIC or ORB fitting?
A -6 JIC, AN or SAE ORB fitting has a 9/16-18 UNF thread, 14.29 mm across the crests with 18 threads per inch, and fits 3/8 in (9.53 mm) tube; the ORB O-ring is AS568-906. The NPT of the same nominal size is 3/8 NPT (18 TPI).
What thread is a -8 JIC or ORB fitting?
A -8 JIC, AN or SAE ORB fitting has a 3/4-16 UNF thread, 19.05 mm across the crests with 16 threads per inch, and fits 1/2 in (12.70 mm) tube; the ORB O-ring is AS568-908. The NPT of the same nominal size is 1/2 NPT (14 TPI).
What thread is a -10 JIC or ORB fitting?
A -10 JIC, AN or SAE ORB fitting has a 7/8-14 UNF thread, 22.23 mm across the crests with 14 threads per inch, and fits 5/8 in (15.88 mm) tube; the ORB O-ring is AS568-910. There is no NPT of the same nominal size.
What thread is a -12 JIC or ORB fitting?
A -12 JIC, AN or SAE ORB fitting has a 1-1/16-12 UN thread, 26.99 mm across the crests with 12 threads per inch, and fits 3/4 in (19.05 mm) tube; the ORB O-ring is AS568-912. The NPT of the same nominal size is 3/4 NPT (14 TPI).
What thread is a -16 JIC or ORB fitting?
A -16 JIC, AN or SAE ORB fitting has a 1-5/16-12 UN thread, 33.34 mm across the crests with 12 threads per inch, and fits 1 in (25.40 mm) tube; the ORB O-ring is AS568-916. The NPT of the same nominal size is 1 NPT (11.5 TPI).
What to Send for a Price
Both ends: the dash size and type (JIC male, JIC female swivel, ORB male) or the pipe or metric thread; the shape (straight, 90° or 45° elbow, tee, bulkhead); the material; the working pressure; and the quantity. For a replacement, a photo of the fitting beside a rule with the caliper reading and the thread count is enough. Quote in 12 hours; from 1 piece, and the more pieces, the lower the unit price.
JIC and ORB Fitting FAQ
A -6 JIC fitting is for 3/8 in (9.53 mm) outside-diameter tube, because the dash number counts sixteenths of an inch: 6/16 = 3/8. The thread is 9/16-18 UNF, 14.29 mm across the crests. A -6 fitting does not have a 3/8 in thread.
The dash number is the tube outside diameter in sixteenths of an inch: -4 is 4/16 = 1/4 in, -8 is 1/2 in, -16 is 1 in. It names the tube, not the thread: a -8 fitting has a 3/4-16 UNF thread.
They have the same 37° seat and the same thread for each dash size, and they mate and seal together; outside aerospace they are used interchangeably. AN fittings are made and inspected to military specifications with tighter tolerances, so a system specified with AN parts needs AN parts.
Yes, the thread for each dash size is the same on both (-8 is 3/4-16 UNF), but they seal in different places: JIC on a 37° cone, ORB on an O-ring squeezed into a chamfer at the mouth of the port. A JIC male end threads into an ORB port but does not seal there.
An AS568 900-series O-ring whose last two digits are the dash size: -4 uses 904, -6 uses 906, -8 uses 908, -12 uses 912 and -16 uses 916. The ORB port itself is defined by SAE J1926-1 (ISO 11926-1).
EKINSUN — a custom parts manufacturer that machines JIC 37°, AN and SAE ORB adapters to NPT, BSPP, BSPT, metric or ORFS in carbon steel, 316 stainless or brass, from 1 piece. Standard sizes can also be supplied from stock, and the more pieces you order, the lower the unit price. Send both ends and the quantity; quote in 12 hours.