A BSPP cap is a type of hydraulic fitting designed to seal off or close the end of a pipe or port that uses British Standard Pipe Parallel (BSPP) threads. Here's a detailed overview of its specifications and uses: What Is a BSPP Cap? Type: Threaded cap fitting Thread Standard: BSPP (British Standard Pipe Parallel) Function: Used to block or seal the end of a BSPP-threaded port or pipe Seal Mechanism: Typically uses a bonded washer or O-ring to create a leak-proof seal against a flat face Key Specifications Thread Type: Parallel (not tapered) Standard: ISO 228-1 (for BSPP threads) Sizes: Common sizes range from 1/8" to 2" or larger Materials: Brass, stainless steel, carbon steel, or plastic depending on application Pressure Rating: Varies by material and size, but generally suitable for medium to high-pressure hydraulic systems Applications Hydraulic systems Pneumatic systems Industrial machinery Agricultural equipment Plumbing systems BSPP caps are often used during maintenance or system modifications to temporarily or permanently seal off unused ports, preventing contamination or fluid leakage.