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Reference data for specifying and sourcing fasteners correctly — the numbers a procurement or design engineer actually needs.
DIN 7991 — Countersunk socket screw
Also referenced as: ISO 10642
Approximated dimensionsFlat, flush-fitting cone head with a hex socket drive. Dimensions below use dk ≈ 1.9×d and k ≈ 0.6×d as an approximation formula rather than an exact published table.
| Size | Head diameter (dk, approx.) | Head height (k, approx.) |
|---|---|---|
| M6 | 11.4 mm | 3.6 mm |
| M8 | 15.2 mm | 4.8 mm |
| M10 | 19.0 mm | 6.0 mm |
| M12 | 22.8 mm | 7.2 mm |
| M16 | 30.4 mm | 9.6 mm |
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