BS 919-4:1964
Specification for screw gauge limits and tolerances, Limits of size for gauges for screw threads of Unified form diameters ¼ in and larger
Gauges, setting plugs and check plugs for standard Unified Coarse (UNC), Fine (UNF) and Unified Extra Fine (UNEF) threads (BS 1580:Parts 1 and 2). Go and not go screw plug, solid screw ring, adjustable screw ring, and adjustable screw caliper gauges; double length setting plugs for go and not go adjustable screw ring gauges and single length setting plugs for adjustable screw caliper gauges; go and not go plain plug and caliper gauges for the crest diameters of product threads.
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