Specification summary of ISO 14582 as applied to hexalobular socket countersunk head screws, high head: the dimensions the standard controls, the full specified size range, and the equivalent DIN/ISO/ASME designations.
ISO 14582 — Scope
ISO 14582 is "Hexalobular socket countersunk head screws, high head". The high-head variant of ISO 14581.
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 14582 does not divide hexalobular socket countersunk head screws, high head 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 14582
| Size | Pitch P (mm) | a (mm) | b (mm) | Head diameter dk (mm) | csh_diam (mm) | csh_height (mm) | r (mm) | tt (mm) | A2 (mm) | t_mean (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 1.0 | 18.0 | 7.4 | 6.5 | 2.2 | 0.1 | T10 | 2.8 | 1.1 | 8~30 | ISO 14582 |
| M4 | 0.7 | 1.4 | 20.0 | 10.02 | 9.0 | 3.01 | 0.2 | T20 | 3.95 | 1.6 | 8~40 | ISO 14582 |
| M5 | 0.8 | 1.6 | 22.0 | 12.0 | 10.8 | 3.5 | 0.2 | T25 | 4.5 | 1.8 | 8~50 | ISO 14582 |
| M6 | 1.0 | 2.0 | 24.0 | 14.44 | 13.1 | 4.22 | 0.25 | T30 | 5.6 | 2.2 | 8~60 | ISO 14582 |
| M8 | 1.25 | 2.5 | 28.0 | 19.38 | 17.8 | 5.69 | 0.4 | T45 | 7.93 | 2.8 | 10~80 | ISO 14582 |
| M10 | 1.5 | 3.0 | 32.0 | 23.0 | 21.1 | 6.5 | 0.4 | T50 | 8.95 | 3.3 | 12~100 | ISO 14582 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Hexalobular Socket Countersunk Head Screws, High Head page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify ISO 14582
Choose ISO 14582 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for hexalobular socket countersunk head screws, high head.
Custom manufacturing · Made to drawing
Need a screw to this standard in a non-standard size?
Parts built to ISO 14582 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.
