British Standard Thread Gaging · ISO/IEC 17025 · Made in USA
British Thread Gages
Plug and Ring Gages for BSP, BSPT, BSW, BSF, and BA Threads
BSPP/BSPT, BSW, BSF, and BA thread plug and ring gages across a full range of sizes and classes — machined to British Standard specifications and certified in our ISO environmentally controlled laboratory.
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ISO 9001Certified Quality Management
ANSI/NCSL Z540-1Accredited Calibration Lab
Made in USASince 1989
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.