This Part of BS 919 specifies requirements for the following gauges
intended for checking screw threads in the regular series, such
as BS Whit., BS Fine, B.A., BSC and BS Conduit.
a) Screw gauges for general and reference use:
1) solid (non-adjustable) screw plug gauges, GO and NOT GO;
2) solid and adjustable GO screw ring gauges;
3) adjustable thread calliper gauges, GO and NOT GO.
NOTE NOT GO effective diameter ring gauges are also included since
they have certain limited applications. In principle, however, their use is
not recommended.
b) Plain plug gauges and plain calliper gauges for the crests of threads.
NOTE Provision is made in the standard for both GO and NOT GO plain
gauges, but GO plain gauges are normally required only in the case of
threads where the corresponding GO screw gauges do not control the
maximum metal condition at the crests of the threads of the product.
c) Setting plugs for adjustable screw ring and thread calliper gauges,
GO and NOT GO.
This standard may be applied also to gauges for any screw threads of
Whitworth form, but not to gauges for Acme, buttress or round threads.
Annex A provides guidance on the various types of gauges.
Information relating to the effective diameter equivalent of pitch and
angle errors and to the thread form of NOT GO effective diameter
gauges is given in Annex B, Annex C and Annex D.
No requirements are specified for the materials for gauges, but
guidance on the hardness of gauges is given in Annex E.
BS 919-2:2007 Referenced Document
BS 84 Parallel screw threads of Whitworth form – Requirements
BS 919-2:2007 history
0000 BS 919-2:2007(2009)
2007BS 919-2:2007 Screw gauge limits and tolerances – Part 2: Specification for gauges for screw threads of Whitworth and B.A. forms
1971BS 919-2:1971 Specification for screw gauge limits and tolerances - Gauges for screw threads of Whitworth and BA forms