Screw: hexagon socket head cap

ISO 12474

ISO 12474 - Hexagon socket head cap screws with metric fine pitch thread

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Hexagon socket head cap screws with metric fine pitch thread instead of the coarse thread of ISO 4762, product grade A. The screw is the cap screw of ISO 4762 with a fine thread: it is driven by a hexagon key seated in a socket sunk into a plain cylindrical head, and the thread diameter fixes the head diameter dk, the head height k, the socket size s, the key engagement depth t and the reference thread length b of 2d + 12 mm, as on the coarse thread screw. A size is the thread diameter, the pitch and the length, as in ISO 12474 - M12 x 1,5 x 80 - 12.9: M10 is made with pitches 1 and 1,25, M12 with 1,25 and 1,5 and M20 with 1,5 and 2, each pair sharing the head. The length decides whether the screw keeps a plain shank or is threaded up to the head. Covers threads M8 x 1 to M36 x 3 with nominal lengths 12 to 200 mm, in property classes 8.8, 10.9 and 12.9 and in stainless steel. It replaced ISO 21269, which also covered M42 x 3 and larger: those sizes were dropped because their smallest cross section lies between the head and the shank instead of in the thread. Together with ISO 4762 it replaced the German DIN 912.