JIC Hydraulic Fittings meet ISO 8434-2 and SAE J514 industry standards for 37 degree flared tube fittings. It is original from MIL-DTL-18866 standards under JIC (Joint Industry Council), JIC fittings are widely used in fuel delivery and fluid power applications. 37 degree JIC flare fitting dimensions is very critical key to seal by metal to metal face. Assemble torque value is based on JIC fitting wrench size chart, by tightening of the nut clamps the bite flare between the body nose producing a leak tight connection.JIC hydraulic fittings catalogue is mainly used in north America agricultural machinery and construction equipment.
They are intended for the connection of tubes and hose fittings to ports in accordance with ISO 6149-1, ISO 1179-1 and ISO 9974-1 and ISO 11926-1. And in new design in fluid power applications, stud ends in accordance with ISO 1179-3 and ISO 9974-2 and ISO 11926-3 shall not be used, the dimensions for the stud end shall conform to ISO 6149-3.
37° flared connectors are suitable for use with ferrous and non-ferrous tubes with outside diameters from 6 mm to 50.8 mm inclusive. These connectors provide full flow connections with metal-to-metal sealing in hydraulic systems operating to the working pressures shown in below table as tube sizes.
| SAE JIC 37 | Thread | Tube outside diameter | Wall thickness of tube for flaring | Working pressure MPa | ||
| Metric | Inch | Metric tube | Inch tube | Carbon steel | ||
| Dash Size | UNF | mm | in | mm | mm | stainless steel |
| 4 | 7/16"X20 | 6 | 1/4" | 1.5 | 1.65 | 35 |
| 5 | 1/2"X20 | 8 | 5/16" | 1.5 | 1.65 | 35 |
| 6 | 9/16"X18 | 10 | 3/8" | 1.5 | 1.65 | 35 |
| 8 | 3/4"X16 | 12 | 1/2" | 2 | 2.1 | 31 |
| 10 | 7/8"X14 | 16 | 5/8" | 2.5 | 2.41 | 24 |
| 12 | 1.1/16"X12 | 20 | 3/4" | 3 | 2.76 | 24 |
| 14 | 1.3/16"X12 | 22 | 7/8" | |||
| 16 | 1.5/16"X12 | 25 | 1" | 3 | 3.05 | 21 |
| 20 | 1.5/8"X12 | 30 | 1.1/4" | 3 | 3.05 | 17 |
| 24 | 1.7/8"X12 | 38 | 1.1/2" | 3 | 3.05 | 14 |
| 32 | 2.1/2"X12 | 50 | 2" | 3.5 | 3.4 | 10.5 |
Both metric and inch tubing can be accommodated by changing the sleeve see catalogue sheet NB300 sleeve for inch tube and NB500 sleeve for metric tube. For new and future designs, the use of metric tubing is preferred.
Overviews of JIC 37 degree flare connections:
Dimensions of JIC 37 Degree Flare Tube End(Male Tube End/Female Swivel Nut End/Male Tube Assembly/Bulkhead Elbow End/Bulkhead Straight End/Male O-ring Tube End)
| Thread | Tube Nut Hex | Bulhkead Locknut Hex | Swivel Nut Hex | Max Drill | Male Turn Back | Assembly Allowance | Bulkhead | Max Bulkhead Thickness | Min. Flare Dia. | |||||||||||||
| Tube Nut | Swivel Nut | Pilot Length - Shapes | Length - Straights | Length - Shapes | Locknut Thickness | Pilot Dia (Max) | Straights | Shapes | ||||||||||||||
| SAE Dash Size | Tube O.D. | T UN/UNF | C | C2 | C3 | D (in) | D1 (in) | L (in) | L3 (in) | F (in) | TE (in) | K2 (in) | L1 (in) | L2 (in) | R (in) | W1) (in) | M1 (in) | M2 (in) | D2 (in) | |||
| (in.) | (mm) | (in.) | (in.) | (in.) | (mm) | |||||||||||||||||
| 2 | 1/8 | — | 5/16-24 | 3/8 | 9/16 | 7/16 | — | 0.062 | — | 0.45 | — | 0.19 | 0.31 | 0.094 | 1.11 | 0.92 | 0.22 | 0.313 | 0.38 | 0.25 | — | |
| 3 | 3/16 | — | 3/8-24 | 7/16 | 5/8 | 1/2 | — | 0.125 | — | 0.48 | — | 0.25 | 0.33 | 0.094 | 1.11 | 0.92 | 0.22 | 0.375 | 0.38 | 0.25 | — | |
| 4 | 1/4 | 6 | 7/16-20 | 9/16 | 11/16 | 9/16 | 14 | 0.172 | 0.156 | 0.55 | 0.56 | 0.19 | 0.34 | 0.094 | 1.2 | 1.02 | 0.28 | 0.438 | 0.38 | 0.25 | 0.254 | |
| 5 | 5/16 | 8 | 1/2-20 | 5/8 | 3/4 | 5/8 | 16 | 0.234 | 0.217 | 0.55 | 0.56 | 0.3 | 0.38 | 0.094 | 1.2 | 1.02 | 0.28 | 0.5 | 0.38 | 0.25 | 0.314 | |
| 6 | 3/8 | 10 | 9/16-18 | 11/16 | 13/16 | 11/16 | 17 | 0.297 | 0.263 | 0.56 | 0.57 | 0.28 | 0.38 | 0.094 | 1.28 | 1.09 | 0.27 | 0.563 | 0.44 | 0.35 | 0.359 | |
| 8 | 1/2 | 12 | 3/4-16 | 7/8 | 1 | 7/8 | 22 | 0.391 | 0.391 | 0.66 | 0.66 | 0.31 | 0.42 | 0.125 | 1.44 | 1.25 | 0.31 | 0.75 | 0.44 | 0.35 | 0.51 | |
| 10 | 5/8 | 14 15 16 | 7/8-14 | 1 | 1 1/8 | 1 | 27 | 0.484 | 0.446 | 0.76 | 0.81 | 0.38 | 0.5 | 0.125 | 1.58 | 1.39 | 0.36 | 0.875 | 0.44 | 0.35 | 0.61 | |
| 12 | 3/4 | 18 20 | 1 1/16-12 | 1 1/4 | 1 3/8 | 1 1/4 | 32 | 0.61 | 0.578 | 0.86 | 0.91 | 0.36 | 0.56 | 0.125 | 1.75 | 1.56 | 0.41 | 1.063 | 0.44 | 0.35 | 0.753 | |
| 14 | 7/8 | 22 | 1 3/16-12 | 1 3/8 | 1 1/2 | 1 3/8 | 36 | 0.718 | 0.68 | 0.89 | 0.95 | 0.38 | 0.58 | 0.125 | 1.75 | 1.56 | 0.41 | 1.188 | 0.44 | 0.35 | 0.849 | |
| 16 | 1 | 25 | 1 5/16-12 | 1 1/2 | 1 5/8 | 1 1/2 | 38 | 0.844 | 0.769 | 0.91 | 0.99 | 0.34 | 0.59 | 0.125 | 1.75 | 1.56 | 0.41 | 1.313 | 0.44 | 0.35 | 0.94 | |
| 20 | 1 1/4 | 28 30 32 | 1 5/8-12 | 2 | 1 7/8 | 2 | 50 | 1.078 | 1.02 | 0.96 | 1.03 | 0.34 | 0.63 | 0.125 | 1.8 | 1.61 | 0.41 | 1.625 | 0.44 | 0.35 | 1.198 | |
| 24 | 1 1/2 | 35 38 | 1 7/8-12 | 2 1/4 | 2 1/8 | 2 1/4 | 60 | 1.312 | 1.23 | 1.08 | 1.16 | 0.5 | 0.73 | 0.125 | 1.81 | 1.62 | 0.41 | 1.875 | 0.31 | 0.22 | 1.416 | |
| 32 | 2 | — | 2 1/2-12 | 2 7/8 | 2 3/4 | 2 7/8 | — | 1.781 | 1.736 | 1.33 | 1.4 | 0.55 | 0.94 | 0.125 | 2.09 | 1.91 | 0.41 | 2.5 | 0.35 | 0.25 | 1.994 | |
| 40 2) | 2 1/2 | — | 3-12 | 3 3/8 | — | — | — | 2.281 | — | — | 0.55 | — | 0.125 | 1.72 | 1.72 | 0.41 | 2.998 | 0.45 | 0.45 | — | ||
Browse our inventory for sturdy JIC hydraulic fittings to add a completely sealed touch to your fluid power system. At Fitsch, we have unparalleled in-stock availability to ship your sought-after hydraulic components, including:
JIC pipe fittings featuring a 37° flare angle
45° pieces for quick and simple angle change
Fittings with a swivel nut that enable easy rotation and reinstallation
Bulkhead options for hydraulic systems with surface-mounted components that connect on both sides of the wall
Male and female configurations that provide diverse connections between different parts within your hydraulic setup
All our JIC pipe fittings are made of extra-durable materials like aluminum, brass, or stainless/zinc-plated carbon steel. They can be additionally processed to reinforce their ability to prolong the connectors’ lifespan, no matter the temperatures and pressure they are expected to withstand.
Our JIC connectors are also compliant with SAE parts, making them easily interchangeable in various tasks.
Fitsch embraces versatility as a JIC fitting supplier to equip you with any component you seek for your hydraulic configuration. Bring your system to leak-free perfection with readily available, non-deforming connectors made with your industry specifics in mind.
You’re welcome to inquire about any JIC fitting online.
Overview Catalog of JIC Hydraulic Fittings
