The table below lists the dimensions catalogued for weld studs (cd and drawn-arc) under ISO 13918. The scope of ISO 13918 itself is not summarised here — where a figure matters, confirm it against the published document.
ISO 13918 — Scope
The table below lists the dimensions catalogued for weld studs (cd and drawn-arc) under ISO 13918. The scope of ISO 13918 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 13918. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by ISO 13918
| Thread size | Length L before weld (mm) | Weld process | Burn-off (mm) | Minimum sheet thickness (mm) | Flange diameter (mm) | Material | Reference standard |
|---|---|---|---|---|---|---|---|
| M3 | 8 | CD (type PT) | 0.5 | 0.6 | — | Mild steel / A2 | ISO 13918 |
| M4 | 10 | CD (type PT) | 0.5 | 0.7 | — | Mild steel / A2 | ISO 13918 |
| M5 | 16 | CD (type PT) | 0.5 | 0.8 | — | Mild steel / A2 | ISO 13918 |
| M6 | 20 | CD (type PT) | 0.5 | 1.0 | — | Mild steel / A2 | ISO 13918 |
| M8 | 25 | Drawn-arc (type PD) | 4.0 | 2.0 | 13.0 | Mild steel | ISO 13918 |
| M10 | 30 | Drawn-arc (type PD) | 4.0 | 2.5 | 16.0 | Mild steel | ISO 13918 |
| M12 | 40 | Drawn-arc (type PD) | 5.0 | 3.0 | 19.0 | Mild steel | ISO 13918 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Weld Studs (CD and Drawn-Arc) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify ISO 13918
Choose ISO 13918 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for weld studs (cd and drawn-arc).
Custom manufacturing · Made to drawing
Need a bolt to this standard in a non-standard size?
Parts built to ISO 13918 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 hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
