ISO 14583 covers the dimensional requirements for hexalobular socket pan head screws. Reproduced below: the complete size table, and the companion and equivalent standards referenced when ordering to this document.
ISO 14583 — Scope
ISO 14583 is "Hexalobular socket pan 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 14583 does not divide hexalobular socket pan 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 14583
| Size | Pitch P (mm) | a_max (mm) | b_min (mm) | d_a_max (mm) | Head diameter dk (mm) | Head height k (mm) | r_min (mm) | rf (mm) | x_max (mm) | tt (mm) | t (mm) | A_ref (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M2 | 0.4 | 0.8 | 25 | 2.6 | 4 | 1.6 | 0.1 | 3.2 | 1 | T6 | 0.7 | 1.75 | 3~20 | ISO 14583 |
| M2.5 | 0.45 | 0.9 | 25 | 3.1 | 5 | 2.1 | 0.1 | 4 | 1.1 | T8 | 0.975 | 2.4 | 3~25 | ISO 14583 |
| M3 | 0.5 | 1 | 25 | 3.6 | 5.6 | 2.4 | 0.1 | 5 | 1.25 | T10 | 1.14 | 2.8 | 4~30 | ISO 14583 |
| (M3.5) | 0.6 | 1.2 | 38 | 4.1 | 7 | 2.6 | 0.1 | 6 | 1.5 | T15 | 1.2 | 3.35 | 5~35 | ISO 14583 |
| M4 | 0.7 | 1.4 | 38 | 4.7 | 8 | 3.1 | 0.2 | 6.5 | 1.75 | T20 | 1.465 | 3.95 | 5~40 | ISO 14583 |
| M5 | 0.8 | 1.6 | 38 | 5.7 | 9.5 | 3.7 | 0.2 | 8 | 2 | T25 | 1.715 | 4.5 | 6~50 | ISO 14583 |
| M6 | 1 | 2 | 38 | 6.8 | 12 | 4.6 | 0.25 | 10 | 2.5 | T30 | 2.22 | 5.6 | 8~60 | ISO 14583 |
| M8 | 1.25 | 2.5 | 38 | 9.2 | 16 | 6 | 0.4 | 13 | 3.2 | T45 | 2.985 | 7.95 | 10~60 | ISO 14583 |
| M10 | 1.5 | 3 | 38 | 11.2 | 20 | 7.5 | 0.4 | 16 | 3.8 | T50 | 3.82 | 8.95 | 12~60 | ISO 14583 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Hexalobular Socket Pan Head Screws page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify ISO 14583
Choose ISO 14583 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for hexalobular socket pan head screws.
Custom manufacturing · Made to drawing
Need a screw to this standard in a non-standard size?
Parts built to ISO 14583 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.
