This part of BS 919 specifies requirements for the following types of
gauges intended for use in the checking of products with unified screw
threads for conformity with BS 1580.
a) Screw gauges:
1) solid screw plug gauges, GO and NOT GO;
2) solid screw ring gauges, GO and NOT GO;
3) adjustable screw ring gauges, GO and NOT GO;
4) adjustable screw calliper gauges GO and NOT GO.
b) Setting plugs for adjustable ring gauges and for calliper gauges,
GO and NOT GO:
1) double length;
2) single length.
c) Screw check plugs for solid screw ring gauges, GO and NOT GO.
d) Plug gauges and calliper gauges for the crest diameters of product
threads, GO and NOT GO.