Screw Thread Gauge Specifications

Table of screw thread gauges specifications

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METRIC THREADS (BS 3643, BS 919 Part 3)
Screw Plug gauges Class 6H. Screw Ring gauges Class 6g.

UNF, UNC, UNEF (BS 1580, BS 919 Part 1)
Screw Plug gauges Class 2B. Screw Ring & Caliper gauges Class 2A

BSW, BSF, WHITWORTH (BS 84, BS 919 Part 2)
Screw Plug gauges Medium/General. Screw Ring & Caliper gauges up to 3/4" Medium U/P. Screw Ring & Caliper gauges over 3/4" Medium/General.

BSP(G) (BS 2779, BS 919 Part 2)
Screw Plug gauges Class A (medium fit). Screw Ring & Caliper gauges Class A or Class B (free fit). Unless otherwise stated Class A will be supplied.

BA (BS 93, BS 919 Part 2)
Screw Plug gauges Normal. Screw Ring & Caliper gauges Normal U/P.

BSPT (R/Rc) BS 21
Screw Plug & Ring gauges System B. Min/Max steps.

NPT/NPTF (ANSI)
Screw Plug & Ring gauges L1 Step Limit.