Hexagon screw, countersunk head
ISO 10642, steel 010.9, plain
ISO 10642/010.9 M20x90 FULL THREAD
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ISO 10642 replaces DIN 7991 | There are some limited consistencies (some screw head heights and diameters have been amended | the M18, M22, and M24 nominal diameters have been removed | stainless steel models have been removed | property classes 10.9 and 12.9 have been added).
Due to their head geometry, countersunk head screws have a limited load capacity according to this standard and possibly do not meet tensile or torsional strength requirements, see DIN EN ISO 898-1
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