BS 7752-1:1994 : Free running type wire thread inserts — Part 1. Specification for ISO metric coarse pitch threads
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This Part of BS 7752 specifies requirements for free running wire thread inserts which, when fitted into an appropriately prepared hole, will:
a) provide ISO metric coarse pitch female threads of tolerance class 5H or 6H with sizes from M2 to M39
inclusive;
b) accept ISO metric male threads conforming to BS 3643‑1:1981 and BS 3643‑2:1981;
c) operate successfully in the temperature range – 50 °C to+ 300 °C.