1/4 BSPP to AN-4 Male

1/4 BSPP to AN-4 Male Adapter — BSP to AN Fitting Conversion

The 1/4 BSPP to AN-4 Male adapter (SKU 700-01-131) is a precision-machined fitting that converts a 1/4 inch BSP parallel (BSPP) threaded port to an AN-4 (dash 4) male fitting. This adapter is essential when connecting AN-4 hose ends or fittings to components that use the BSPP thread standard — common in European performance engine components, oil coolers, and some OEM fluid system ports.

BSP and AN Thread Standards in Motorsport Plumbing

BSP (British Standard Pipe) is a thread standard used widely in European automotive and industrial fluid fittings, while AN (Army-Navy) is the dominant thread and fitting standard in motorsport hose and fitting systems. Converting between these standards requires a correctly specified adapter — an incorrect or poorly made adapter risks thread damage, leaks, and fitting failure in high-pressure fuel or oil circuits. This Nuke Performance adapter provides a reliable, correctly dimensioned conversion between the two standards.

Key Features

• 1/4 BSPP female thread — seals with a bonded seal or parallel face seal
• AN-4 Male fitting — compatible with AN-4 hose ends and female AN fittings
• Precision-machined from aluminium or steel for motorsport quality standards
• Enables AN plumbing connection to BSPP threaded ports
• Genuine Nuke Performance fitting adapter

Available from Arctic Performance Parts

Part of the Nuke Performance adapter and fitting range stocked for fuel system builders and motorsport plumbing specialists in Norway, Sweden, and Denmark.