ISO 2936 is the standard cited for hex bit sockets. This page sets out what the standard controls for this part, reproduces the dimensional table supplied against it, and notes the related designations referenced on drawings.
ISO 2936 — Scope
The table below lists the dimensions catalogued for hex bit sockets under ISO 2936. The scope of ISO 2936 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to ISO 2936. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by ISO 2936
| Hex size | Square drive | Mating socket screw | Purpose |
|---|---|---|---|
| 3 mm | 1/4 in | M4 | torque-controlled tightening |
| 4 mm | 1/4 in | M5 | torque-controlled tightening |
| 5 mm | 3/8 in | M6 | torque-controlled tightening |
| 6 mm | 3/8 in | M8 | torque-controlled tightening |
| 8 mm | 1/2 in | M10 | torque-controlled tightening |
| 10 mm | 1/2 in | M12 | torque-controlled tightening |
| 14 mm | 1/2 in | M16 | torque-controlled tightening |
Companion Standards
A complete specification for hex bit sockets normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. ISO 2936 is one of them, not all of them.
When to Specify ISO 2936
Choose ISO 2936 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for hex bit sockets.
Custom manufacturing · Made to drawing
Need a fastener tool to this standard in a non-standard size?
Parts built to ISO 2936 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.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
