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Description
304C03 (often formatted as 304-C-03 or 0304-C-03) is the standard industry part number for a #03 Female JIC (SAE 37° Flare) Hydraulic Cap Nut.
It is designed to cap off, protect, and seal open male JIC fluid lines or adapter ports from leakage and particle 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 utilizes internal straight threads and a 37-degree cone seat that compresses firmly against a matching male flare to generate a tight mechanical seal.
- 03 (Size): Indicates the hydraulic fraction size in 16ths of an inch (
3/16″):- Tube Outer Diameter (O.D.): 3/16-inch.
- Thread Size: 3/8-24 UNF straight threads.
- Hex Nut Size: Typically requires a 1/2-inch wrench to secure.
Key Performance Features
- High-Pressure Rating: Engineered for intensive system requirements, typically supporting a maximum dynamic working pressure of 7,500 PSI with a 30,000 PSI burst ceiling.
- Standardization: Built to meet strict SAE J514 (specifically code 070112) dimensional and manufacturing specifications, ensuring precise alignment across global industrial and mobile equipment.
- Interchangeability: Directly cross-references with equivalent part numbers across major fluid-power brands, including the Brennan 0304-C-03, Parker 3 FNTX-S, Gates 03FJ-CAP, Aeroquip 210292-3S, and Weatherhead 5129X3.
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