This Standard applies to T-slots as used on machine tools for the mounting of fixtures, attachments, and accessories; and to the bolts, nuts, and tongues used in such slots.
ASME B5.1M-1985 history
0000 ASME B5.1M-1985(R2014)
1985ASME B5.1M-1985 T-Slots, Their Bolts, Nuts, and Tongues Revision of ANSI B5.1-1975; Should Be Used Instead of ANSI B5.1. Which Was Cancelled in 1985