The Castair JIC12XJIC12 is a JIC-12 to JIC-12 adapter fitting for compressed air distribution systems. This fitting connects two -12 AN/JIC-12 hose ends, tube fittings, or equipment ports in a straight configuration. JIC-12 uses a 1-1/16-12 UNF thread and mates with 3/4-inch OD tubing flared to a 37-degree seat. It is the next size up from JIC-10 (7/8-14 UNF) and handles higher flow rates appropriate for larger diameter air distribution lines.
About JIC Fittings in Compressed Air Systems
JIC (Joint Industry Council) fittings use a 37-degree flare seating surface. This seating angle creates a metal-to-metal seal that is leak-resistant under pressure and does not require sealant tape or thread compound on the flare seating surface (though thread sealant is still appropriate on the straight threads in certain configurations). JIC fittings are widely used in hydraulic systems and increasingly in compressed air distribution where secure, serviceable connections are needed at equipment connections, regulator ports, and manifold tees.
The dash number in JIC sizing corresponds to the tubing OD in 1/16-inch increments: JIC-10 fits 5/8-inch OD tubing (7/8-14 UNF thread), JIC-12 fits 3/4-inch OD tubing (1-1/16-12 UNF thread).
Fitting Details
- Part Number: JIC12XJIC12
- Connection 1: JIC-12 (1-1/16-12 UNF, 37-degree flare, 3/4-inch OD tubing)
- Connection 2: JIC-12 (1-1/16-12 UNF, 37-degree flare, 3/4-inch OD tubing)
- Type: Union adapter — JIC-12 x JIC-12 (confirm male/female configuration before ordering)
- Seating: 37-degree flare metal-to-metal seal
- Category: Air Distribution Piping / JIC Fittings
Common Applications
- Joining two JIC-12 hose or tube assemblies in a compressed air main or branch line
- Connections at larger-bore equipment discharge ports, aftercoolers, or filter housings with JIC-12 ports
- Extending or repairing JIC-12 air distribution lines
- Compressor discharge connections where JIC-12 fittings are specified
Flow Capacity Context
JIC-12 (3/4-inch OD tubing) carries significantly more flow than JIC-10 (5/8-inch OD tubing). From Castair's pipe sizing chart, a 3/4-inch equivalent line handles up to approximately 30-40 CFM over a 100-foot run before pressure drop becomes significant. Match your fitting size to your line size — using a JIC-12 fitting in a JIC-10 line requires a reducing adapter, not this part.
Installation Notes
- No PTFE tape on the 37-degree flare seating surface — the metal-to-metal flare creates the seal
- Inspect both flare seats before assembly — damaged seats will not seal
- Torque to approximately finger-tight plus 1/4 to 1/2 turn with a wrench
- Leak-check all connections after pressurizing the system
Technical Specifications
- Part Number: JIC12XJIC12
- Connection Type: JIC-12 x JIC-12
- Thread Size: 1-1/16-12 UNF (both ends)
- Flare Angle: 37 degrees
- Tubing OD (nominal): 3/4 inch
- Application: Compressed air distribution piping, pneumatic connections
Why Buy From Air Compressor Factory Direct?
We stock Castair air distribution fittings and accessories. If you're planning or expanding your shop's compressed air piping system, we can help you spec the right fitting combinations for your line sizes and equipment. Free shipping on qualifying orders. Call 866-217-0063 for help selecting the right fittings for your installation.
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