For countersunk socket screws, ISO 10642 fixes the geometry and the tolerances. The sections below describe the scope of the document, the properties it deliberately leaves to companion standards, and the equivalent designations across standards bodies.
ISO 10642 — Scope
ISO 10642 is "Hexagon socket countersunk head screws".
Material, property class, surface finish and packaging are governed by separate documents — ISO 898-1 and ISO 898-2 for mechanical property classes, ISO 4042 for electroplated finishes.
Tolerance & Product Grades
ISO 10642 does not divide countersunk socket screws into product grades. Tolerances are given as limits on the individual dimensions in the table.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by ISO 10642
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Hex key s (mm) | Countersink angle (deg) | Reference standard |
|---|---|---|---|---|---|---|
| M3 | 0.5 | 6.72 | 1.86 | 2.0 | 90 | ISO 10642 / DIN 7991 |
| M4 | 0.7 | 8.96 | 2.48 | 2.5 | 90 | ISO 10642 / DIN 7991 |
| M5 | 0.8 | 11.2 | 3.1 | 3.0 | 90 | ISO 10642 / DIN 7991 |
| M6 | 1.0 | 13.44 | 3.72 | 4.0 | 90 | ISO 10642 / DIN 7991 |
| M8 | 1.25 | 17.92 | 4.96 | 5.0 | 90 | ISO 10642 / DIN 7991 |
| M10 | 1.5 | 22.4 | 6.2 | 6.0 | 90 | ISO 10642 / DIN 7991 |
| M12 | 1.75 | 26.88 | 7.44 | 8.0 | 90 | ISO 10642 / DIN 7991 |
| M14 | 2.0 | 30.0 | 8.4 | 10.0 | 90 | ISO 10642 / DIN 7991 |
| M16 | 2.0 | 33.6 | 9.3 | 10.0 | 90 | ISO 10642 / DIN 7991 |
| M20 | 2.5 | 40.32 | 11.2 | 12.0 | 90 | ISO 10642 / DIN 7991 |
| M24 | 3.0 | 47.04 | 13.0 | 14.0 | 90 | ISO 10642 / DIN 7991 |
Equivalent Standards
ISO 10642 countersunk socket screws correspond to DIN 7991.
Companion Standards
ISO 10642 controls only the geometry of countersunk socket screws. The mechanical strength is set by ISO 898-1 (bolts, screws and studs) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards such as ISO 4042 for electroplating. For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).
Custom manufacturing · Made to drawing
Need a screw to this standard in a non-standard size?
Parts built to ISO 10642 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
