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Description
304C20 (often formatted as 304-C-20 or 0304-C-20) is the standard industry part number for a #20 Female JIC (SAE 37° Flare) Hydraulic Cap Nut.
It is designed to close off, seal, and protect open male JIC hydraulic lines or port adapters from leaks and external contamination. The alphanumeric designation breaks down into the following technical specifications:
Model & Spec Breakdown
- 304-C / 0304-C (Series): Identifies the component as a Female JIC Cap. It features internal straight threads and a 37-degree cone seat that creates a reliable mechanical seal against a matching male flare.
- 20 (Size): Indicates the hydraulic dash size in 16ths of an inch (
20/16″):- Tube Outer Diameter (O.D.): 1-1/4 inch.
- Thread Size: 1-5/8-12 UN/UNF straight threads.
- Hex Nut Size: Typically requires a 2-inch wrench to tighten.
Key Performance Features
- Pressure Rating: Built to operate safely within heavy fluid systems, typically supporting maximum dynamic pressures between 2,250 PSI and 4,000 PSI depending on the specific manufacturing style (forged vs. straight steel).
- Standard Compliance: Manufactured to meet strict SAE J514 engineering guidelines, ensuring consistent alignment and torque performance across global hydraulic machinery.
- Interchangeability: Directly substitutes for equivalent cross-referenced part numbers across major fluid-power brands, including Parker 20 FNTX-S, Gates 20FJ-CAP, Aeroquip 210292-20S, and Weatherhead C5129X20.
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