The table below lists the dimensions catalogued for carriage bolts under DIN 603. The scope of DIN 603 itself is not summarised here — where a figure matters, confirm it against the published document.
DIN 603 — Scope
The table below lists the dimensions catalogued for carriage bolts under DIN 603. The scope of DIN 603 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 DIN 603. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 603
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Square neck width (mm) | Square neck depth (mm) | Common length range (mm) | Reference standard |
|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 13.0 | 3.0 | 5.0 | 2.5 | 16~80 | DIN 603 / ISO 8677 |
| M6 | 1.0 | 16.0 | 3.5 | 6.0 | 3.0 | 16~120 | DIN 603 / ISO 8677 |
| M8 | 1.25 | 20.0 | 4.5 | 8.0 | 4.0 | 20~160 | DIN 603 / ISO 8677 |
| M10 | 1.5 | 25.0 | 5.5 | 10.0 | 5.0 | 25~200 | DIN 603 / ISO 8677 |
| M12 | 1.75 | 30.0 | 7.0 | 12.0 | 6.0 | 30~240 | DIN 603 / ISO 8677 |
| M14 | 2.0 | 35.0 | 8.0 | 14.0 | 7.0 | 40~260 | DIN 603 / ISO 8677 |
| M16 | 2.0 | 40.0 | 9.0 | 16.0 | 8.0 | 40~300 | DIN 603 / ISO 8677 |
| M20 | 2.5 | 50.0 | 11.0 | 20.0 | 10.0 | 50~300 | DIN 603 / ISO 8677 |
Companion Standards
A complete specification for carriage bolts normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. DIN 603 is one of them, not all of them.
When to Specify DIN 603
DIN 603 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
Custom manufacturing · Made to drawing
Need a bolt to this standard in a non-standard size?
Parts built to DIN 603 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.
