Bolt: hexagon head

ISO 4018

ISO 4018 - Hexagon head screws - Product grade C

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Hexagon head screws threaded up to the head, metric coarse pitch thread, product grade C instead of the grades A and B of ISO 4017, so with wider tolerances. The screw is turned by a spanner on a hexagon head and is threaded over its whole length, so one size fits any grip and it can be driven into a tapped hole to any depth. The head is the head of ISO 4016 value for value: it keeps the nominal width across flats s and head height k of ISO 4017, but its tolerances are wider and its minimum width across corners e and bearing face dw are smaller than in grade A; the thread has tolerance 8g, and the screws are made in property classes 4.6 and 4.8 up to M39. The thread reaches the head but for the run-out under it, which the standard limits to a max = 3P, so the guaranteed thread length is l - 3P. The range of standard lengths follows a rule instead of a table: from 2d rounded to the nearest nominal length, 120 mm for M64, up to ten diameters and never above 200 mm - a longer joint takes the partially threaded bolt of ISO 4016. Covers threads M5 to M64 with nominal lengths 10 to 200 mm. Its German predecessor DIN 558 was replaced by DIN EN ISO 4018; the partially threaded counterpart is ISO 4016 and the product grade A and B version is ISO 4017.