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This part of BS 7751 specifies requirements for prevailing torque wire threads which, when fitted into an appropriately prepared hole, will:
a) provide ISO metric coarse pitch female threads of tolerance class 5H or 6H in the free running coils with sizes
from M8 X 1 to M24 inclusive;
b) accept ISO metric male threads conforming to BS 3643 : Part 1 : 1981 and BS 3643 : Part 2 : 1981;
c) give a friction resistance to rotation of a male threaded component assembled with it, of such a value that the
insert assembly is considered self locking;
d) operate successfully in the temperature range -50 ᵒC to +300 ᵒC.