Specification summary of ISO 7380 as applied to button head socket screws: the dimensions the standard controls, the full specified size range, and the equivalent DIN/ISO/ASME designations.
ISO 7380 — Scope
ISO 7380 is "Button head screws with hexagon socket".
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 7380 does not divide button head 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 7380
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Hex socket s (mm) | Reference standard |
|---|---|---|---|---|---|
| M3 | 0.5 | 5.7 | 1.65 | 2.0 | ISO 7380-1 / DIN 7380 |
| M4 | 0.7 | 7.6 | 2.2 | 2.5 | ISO 7380-1 / DIN 7380 |
| M5 | 0.8 | 9.5 | 2.75 | 3.0 | ISO 7380-1 / DIN 7380 |
| M6 | 1.0 | 10.5 | 3.3 | 4.0 | ISO 7380-1 / DIN 7380 |
| M8 | 1.25 | 14.0 | 4.4 | 5.0 | ISO 7380-1 / DIN 7380 |
| M10 | 1.5 | 17.5 | 5.5 | 6.0 | ISO 7380-1 / DIN 7380 |
| M12 | 1.75 | 21.0 | 6.6 | 8.0 | ISO 7380-1 / DIN 7380 |
| M14 | 2.0 | 24.5 | 7.7 | 10.0 | ISO 7380-1 / DIN 7380 |
| M16 | 2.0 | 28.0 | 8.8 | 10.0 | ISO 7380-1 / DIN 7380 |
| M20 | 2.5 | 35.0 | 11.0 | 12.0 | ISO 7380-1 / DIN 7380 |
Equivalent Standards
ISO 7380 button head socket screws are widely cross-referenced to the same dimensional family.
When to Specify ISO 7380
Choose ISO 7380 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for button head socket screws.
Custom manufacturing · Made to drawing
Need a screw to this standard in a non-standard size?
Parts built to ISO 7380 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.
