Gauges for general and reference use, and setting plugs for screw ring and thread caliper gauges. Tolerances apply to gauges for screw threads of Whitworth and BA forms. General requirements, tables of tolerances; appendices on conventional illustration of tolerance zones, effective diameter equivalent of pitch and angle errors, thread form of not go effective diameter gauges and setting plugs, examples of the use of tolerance tables.Cross References:BS 84BS 93BS 811BS 1044BS 2517