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ISO 898-1 class 10.9 countersunk socket screws to DIN 7991 / ISO 10642. High-preload flush fasteners — head geometry reduces tensile capacity versus a DIN 912 of the same class. Listed M3–M10.
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ISO 898-1 property class 10.9 countersunk socket screws to DIN 7991 / ISO 10642. Alloy steel, 90° flush head, internal hex, listed M3–M10. Use only where the design accepts the reduced tensile area of a countersunk head at 10.9 — DIN 912 remains the stronger geometry for full preload.
Use only where the design accepts the reduced tensile area of a countersunk head at 10.9. For maximum clamp in a compact joint, DIN 912 10.9 in a counterbore is the stronger geometry. Confirm coating practice for 10.9. Mate with class 10 nuts if a nut is used.
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ISO 898-1 class 10.9
DIN 7991 / ISO 10642
Steel
Countersunk Socket Screw
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