British Thread Gages

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British Standard threads remain in wide use across legacy machinery, hydraulics, fasteners, and instruments. WESTport manufactures the complete British thread gage line — plug and ring gages — to the governing British Standards, so parts built to imperial-era specs still inspect to a traceable standard. BSPP / BSPT (British Standard Pipe, parallel and taper) — BS 21. BSW (British Standard Whitworth) & BSF (British Standard Fine) — BS 84. BA (British Association) — BS 93, for small-diameter instrument threads. GO and NO GO members across a full range of sizes and classes, each certified in our ISO/IEC 17025 accredited laboratory.