Specification summary of ISO 14580 as applied to hexalobular socket cheese head screws: the dimensions the standard controls, the full specified size range, and the equivalent DIN/ISO/ASME designations.
ISO 14580 — Scope
ISO 14580 is "Hexalobular socket cheese 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 14580 does not divide hexalobular socket cheese head 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 14580
| Size | Pitch P (mm) | a (mm) | b (mm) | Head diameter dk (mm) | dk_mean (mm) | da (mm) | Head height k (mm) | n_min (mm) | r (mm) | t_min (mm) | x (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.7 | 25.0 | 3.0 | 2.9 | 2.0 | 1.1 | 0.46 | 0.1 | 0.45 | 0.9 | 2~16 | ISO 14580 |
| M2 | 0.4 | 0.8 | 25.0 | 3.8 | 3.7 | 2.6 | 1.4 | 0.56 | 0.1 | 0.6 | 1.0 | 3~20 | ISO 14580 |
| M2.5 | 0.45 | 0.9 | 25.0 | 4.5 | 4.4 | 3.1 | 1.8 | 0.66 | 0.1 | 0.7 | 1.1 | 3~25 | ISO 14580 |
| M3 | 0.5 | 1.0 | 25.0 | 5.5 | 5.4 | 3.6 | 2.0 | 0.86 | 0.1 | 0.85 | 1.25 | 4~30 | ISO 14580 |
| (M3.5) | 0.6 | 1.2 | 38.0 | 6.0 | 5.9 | 4.1 | 2.4 | 1.06 | 0.1 | 1.0 | 1.5 | 5~35 | ISO 14580 |
| M4 | 0.7 | 1.4 | 38.0 | 7.0 | 6.9 | 4.7 | 2.6 | 1.26 | 0.2 | 1.1 | 1.75 | 5~40 | ISO 14580 |
| M5 | 0.8 | 1.6 | 38.0 | 8.5 | 8.4 | 5.7 | 3.3 | 1.26 | 0.2 | 1.3 | 2.0 | 6~50 | ISO 14580 |
| M6 | 1.0 | 2.0 | 38.0 | 10.0 | 9.9 | 6.8 | 3.9 | 1.66 | 0.25 | 1.6 | 2.5 | 8~60 | ISO 14580 |
| M8 | 1.25 | 2.5 | 38.0 | 13.0 | 12.85 | 9.2 | 5.0 | 2.06 | 0.4 | 2.0 | 3.2 | 10~80 | ISO 14580 |
| M10 | 1.5 | 3.0 | 38.0 | 16.0 | 15.85 | 11.2 | 6.0 | 2.56 | 0.4 | 2.4 | 3.8 | 12~80 | ISO 14580 |
Companion Standards
ISO 14580 controls only the geometry of hexalobular socket cheese head 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).
When to Specify ISO 14580
Choose ISO 14580 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for hexalobular socket cheese head screws.
Custom manufacturing · Made to drawing
Need a screw to this standard in a non-standard size?
Parts built to ISO 14580 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.
