ISO 3315:2018

This document is applicable to driving parts of hand-operated square drive socket wrenches.
NOTE The driving parts covered by this document are the ones identified in ISO 1703:2018 under reference No. 6 1 00 01 0 and 6 1 00 01 1, 6 1 00 03 0, 6 1 00 04 0, 6 1 00 05 0 and 6 1 00 05 1, 6 1 00 06 0 and 6 1 00 06 1, 6 1 00 09 0 as well as 6 1 00 10 0 and 6 1 00 10 1.
It specifies:
a) the overall dimensions;
b) the minimum Rockwell hardness value for their driving squares;
c) the method of torque testing;
d) the minimum torsional strength values;
e) the designation;
f) the marking.