DELPHI FITTINGS
Part Number: 318
37° JIC Tube Nut
Product Overview
The Delphi Fittings Part 318 is a 37° JIC Tube Nut, an essential component for creating JIC flare connections with hydraulic tubing. This female nut is designed to be used in conjunction with a 37° JIC Tube Sleeve (Part #319). When assembled, the nut slides over a 37° flared tube end, and the sleeve sits behind the flare. As the nut is tightened onto a male JIC fitting, it presses the sleeve against the back of the flare, forcing the flared tube surface into tight, metal-to-metal contact with the 37° cone of the male JIC fitting, creating a reliable high-pressure seal. Manufactured from high-quality carbon steel and zinc-plated for corrosion resistance, the Part 318 JIC Tube Nut is a standard component in hydraulic systems worldwide.
Key Features & Specifications
| Material | High-Grade Carbon Steel |
|---|---|
| Thread Type | Female JIC (Unified National Fine - UNF) (per SAE J514 / ISO 8434-2) |
| Component Type | Tube Nut for 37° Flare Connections |
| Compatibility | Used with 37° flared tubing and JIC Tube Sleeve (Part #319) to connect to male JIC fittings. |
| Sealing Mechanism | Draws the flared tube and sleeve against the male JIC 37° cone to create a metal-to-metal seal. |
| Corrosion Protection | Standard Zinc Plating for enhanced durability. |
| Primary Function | To secure a flared tube end, with a sleeve, to a male JIC 37° flare fitting. |
Commonly Available Sizes (Part #318 Series)
Delphi Fittings offers the 37° JIC Tube Nut in a comprehensive range of sizes corresponding to common hydraulic tube outside diameters (OD) and JIC fitting sizes.
Examples include (for Tube OD / JIC Size):
- 318-02: For 1/8" Tube OD (5/16-24 Thread)
- 318-03: For 3/16" Tube OD (3/8-24 Thread)
- 318-04: For 1/4" Tube OD (7/16-20 Thread)
- 318-05: For 5/16" Tube OD (1/2-20 Thread)
- 318-06: For 3/8" Tube OD (9/16-18 Thread)
- 318-08: For 1/2" Tube OD (3/4-16 Thread)
- 318-10: For 5/8" Tube OD (7/8-14 Thread)
- 318-12: For 3/4" Tube OD (1-1/16-12 Thread)
- 318-14: For 7/8" Tube OD (1-3/16-12 Thread)
- 318-16: For 1" Tube OD (1-5/16-12 Thread)
- 318-20: For 1-1/4" Tube OD (1-5/8-12 Thread)
- 318-24: For 1-1/2" Tube OD (1-7/8-12 Thread)
- 318-32: For 2" Tube OD (2-1/2-12 Thread)
Note: Short flare nuts (Part #302) and standard/long flare nuts (Part #304) are also available. Part #318 is typically a standard length nut. Always ensure compatibility with the tube, sleeve (Part #319), and mating male JIC fitting. For unlisted sizes, please contact our sales team.
Applications
The Part 318 JIC Tube Nut is essential for creating JIC flare connections in a multitude of hydraulic systems:
- Connecting rigid hydraulic tubing to pumps, valves, cylinders, and other components with male JIC ports.
- Fabrication of custom hydraulic lines and assemblies.
- Use in mobile equipment (construction, agriculture, forestry), industrial machinery, and manufacturing automation.
- Automotive and transportation fluid systems.
- Any application where a reliable, high-pressure, and reusable connection is required for flared tubing.
Installation & Usage Guidelines
- Ensure the tube end is precisely flared to a 37° angle using a proper flaring tool. The flare surface should be smooth and free of cracks or imperfections.
- Slide the JIC Tube Nut (Part #318) onto the tube, followed by the JIC Tube Sleeve (Part #319), ensuring the sleeve is oriented correctly behind the flare.
- Align the flared tube end with the male JIC fitting's 37° cone.
- Thread the Tube Nut onto the male JIC fitting by hand until finger tight. Ensure the threads engage smoothly.
- Use two wrenches: one to hold the male JIC fitting steady (backup wrench) and one to tighten the Tube Nut to the recommended torque for the specific tube size and material. Do not overtighten.
- The seal is formed by the compression of the flared tube surface against the male JIC cone.
Why Choose Delphi Fittings Part 318?
- Essential JIC Component: A fundamental part for creating reliable 37° flared tube connections.
- High-Pressure Performance: Designed to withstand the pressures of demanding hydraulic systems when correctly assembled.
- Durable Material: Manufactured from high-grade carbon steel for strength and long service life.
- Corrosion Resistant: Zinc-plated for protection against environmental factors.
- Standard Compliance: Meets SAE J514 / ISO 8434-2 standards, ensuring compatibility with other standard JIC components.
- Quality Manufacturing: Produced under Delphi Fittings' ISO 9001:2015 certified quality management system for consistent reliability.
Get a Quote for Part 318 - 37° JIC Tube Nut
For creating secure and reliable JIC flared tube connections, the Part 318 Tube Nut is an indispensable component. Don't forget the mating Part #319 JIC Tube Sleeve. Contact Delphi Fittings for wholesale pricing, bulk order information, and expert assistance with your hydraulic component needs.
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