Enter the system and dash, a thread or a measurement. Without a designation, enter the measured male thread outside diameter in mm and the threads per inch (a value under 5 is read as a pitch in mm). Below, an offered fitting can be checked against it: system, dash and thread.
On the end alone: system, dash size and thread. The shape, the other end, the material and the pressure rating are checked against the maker’s data.
JIC 37° flare fittings (SAE J514 / ISO 8434-2) and O-ring face seal fittings, ORFS (SAE J1453 / ISO 8434-3), are named by an inch dash size: -8, -12. Enter the system and dash (JIC -8, ORFS -10), the thread (9/16-18 UNF, 1-3/16-12) or a measured male thread outside diameter with the threads per inch: the tool gives the Unified thread (UNF, UN or UNS) and its diameter, the tube outside diameter, the ORFS face seal O-ring (AS568), draws the male end, checks an offered fitting and writes an RFQ line.
No pressure rating is given: it depends on the maker, the size and the shape. 24° cone fittings (DIN 2353 / ISO 8434-1) have their own identifier.
The male end has a 37° cone and seals metal to metal on the cones of the male and female. The thread is Unified: UNF up to -10, 12 threads per inch UN from -12. An SAE O-ring boss port of the same dash size has the same thread.
The male end has a flat face with an O-ring that seals against the flat face of the female. Its threads are its own, not those of the JIC fitting of the same dash, and the sizes run from -4 to -24. The O-ring is an AS568 size with a 1/16 in section.
Dash -8 means a tube of 8/16 = 1/2 in outside diameter, not a thread. JIC and ORFS of the same dash have different threads, and two threads appear in both systems at different dash sizes: 9/16-18 (JIC -6 and ORFS -4) and 1 3/16-12 (JIC -14 and ORFS -12).
| Dash | Tube outside diameter | JIC 37° thread | ORFS thread | ORFS O-ring |
|---|---|---|---|---|
| -4 | 1/4 in6.35 mm | 7/16-20 UNF11.11 mm | 9/16-18 UNF14.29 mm | AS568-011 |
| -5 | 5/16 in7.94 mm | 1/2-20 UNF12.7 mm | — | — |
| -6 | 3/8 in9.52 mm | 9/16-18 UNF14.29 mm | 11/16-16 UN17.46 mm | AS568-012 |
| -8 | 1/2 in12.7 mm | 3/4-16 UNF19.05 mm | 13/16-16 UN20.64 mm | AS568-014 |
| -10 | 5/8 in15.88 mm | 7/8-14 UNF22.23 mm | 1-14 UNS25.4 mm | AS568-016 |
| -12 | 3/4 in19.05 mm | 1 1/16-12 UN26.99 mm | 1 3/16-12 UN30.16 mm | AS568-018 |
| -14 | 7/8 in22.23 mm | 1 3/16-12 UN30.16 mm | — | — |
| -16 | 1 in25.4 mm | 1 5/16-12 UN33.34 mm | 1 7/16-12 UN36.51 mm | AS568-021 |
| -20 | 1 1/4 in31.75 mm | 1 5/8-12 UN41.28 mm | 1 11/16-12 UN42.86 mm | AS568-025 |
| -24 | 1 1/2 in38.1 mm | 1 7/8-12 UN47.63 mm | 2-12 UN50.8 mm | AS568-029 |
| -32 | 2 in50.8 mm | 2 1/2-12 UN63.5 mm | — | — |
A figure is given only where at least two sources state it and none of the consulted ones states a different value. Under each thread is its nominal major diameter in mm. None of the sources consulted lists an ORFS -5, -14 or -32. The inside diameter and section of the O-rings are not given (the O-ring size finder has them); no pressure rating is given, as it depends on the maker, the size and the shape.
The thread and the seal decide only whether an end mates. A request also needs the shape (straight, elbow, tee, adapter), the other end (JIC, ORFS, an SAE O-ring boss or BSPP port, a hose end) and the material: zinc-plated or stainless steel. No pressure rating is given here: it depends on the maker, the size and the shape.
Threads and tube sizes: two hydraulic thread identification guides, a hose maker’s coupling torque table, a fitting maker’s master catalogue and an encyclopaedia article on JIC fittings. ORFS O-rings: the listings of two face seal O-ring kits. The 45° flare: the same article and a coupling maker’s note.
No. At every dash size the two systems share, they use different threads (JIC -6 is 9/16-18 UNF, ORFS -6 is 11/16-16 UN), and they seal differently: a JIC end seals metal to metal on a 37° cone, an ORFS end with an O-ring on a flat face. Two threads also appear in both systems at different dash sizes: 9/16-18 is JIC -6 and ORFS -4, and 1 3/16-12 is JIC -14 and ORFS -12. A nut starts on either male end, so check the face before fitting.
The tube outside diameter in sixteenths of an inch: -8 is 8/16, a 1/2 in (12.70 mm) tube, and -12 a 3/4 in tube. The dash number is not the thread size; the thread of each dash size is in the table and differs between JIC and ORFS.
Not directly. A 45° SAE flare looks like a JIC 37° flare, but the cone angle differs and the two are not interchangeable; the sources consulted differ on which dash sizes share a thread with it, so none is listed. A 24° cone fitting (DIN 2353 / ISO 8434-1) has a metric thread and a different cone angle, so it does not mate with a JIC end either; the 24° cone fitting identifier covers it.
An AS568 size with a 1/16 in section: -011 on -4, -012 on -6, -014 on -8, -016 on -10, -018 on -12, -021 on -16, -025 on -20 and -029 on -24. The compound is chosen to suit the fluid and the temperature. The O-ring size finder gives the inside diameter and section of each size.
The system and dash size (for example JIC -8 or ORFS -10) with the thread, the shape (straight, elbow 90°, tee or an adapter to a different end), each end type (male, female swivel, bulkhead, port end), the material (zinc-plated steel or stainless 316), the quantity, and a photograph of the male end and the nut. Pressure ratings are not given here: they depend on the maker, the size and the shape.
A row of this table is a cross-check of the end, not a fitting selection. Attach a photograph of the male end and the nut with the shape and the other end, and Vessel Core checks them before an offer goes back.
