GN 313 is the international standard for clamping handle screw (short) — din 6336 / gn 313 (series 042). This page sets out what the standard governs, the size range it specifies, and the related standards you will see referenced in datasheets.
GN 313 — Scope
GN 313 specifies the dimensions and tolerances of clamping handle screw (short) — din 6336 / gn 313 (series 042). Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).
Tolerance & Product Grades
GN 313, alongside the related DIN 6336 / GN 313 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.
Dimensions Specified by GN 313
| Thread size | Pitch (mm) | Length L (mm) | Handle length (mm) | Knob diameter (mm) | Reference standard |
|---|---|---|---|---|---|
| M5 | 0.8 | 20 | 45 | 28 | DIN 6336 / GN 313 |
| M6 | 1.0 | 25 | 50 | 32 | DIN 6336 / GN 313 |
| M8 | 1.25 | 30 | 60 | 40 | DIN 6336 / GN 313 |
| M10 | 1.5 | 40 | 70 | 45 | DIN 6336 / GN 313 |
| M12 | 1.75 | 50 | 80 | 50 | DIN 6336 / GN 313 |
Companion Standards
GN 313 controls only the geometry of clamping handle screw (short) — din 6336 / gn 313 (series 042). The mechanical strength is set by ISO 898-1 (bolts and screws) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards (e.g. ISO 4042 for electroplating). For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).
When to Specify GN 313
Choose GN 313 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for clamping handle screw (short) — din 6336 / gn 313 (series 042).