DIN 603 carriage bolt: dimensions from M5 to M16
Round head bolt with a square neck that locks into wood or a square hole, from M5 to M16. It is tightened from the nut.
DIN 603 carriage bolt dimensions
| Size | Pmm | dkmax, mm | kmax, mm | vmax, mm | fmax, mm | bl ≤ 125, mm | b125 < l ≤ 200, mm |
|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 13.55 | 3.3 | 5.48 | 4.1 | 16 | 22 |
| M6 | 1 | 16.55 | 3.88 | 6.48 | 4.6 | 18 | 24 |
| M8 | 1.25 | 20.65 | 4.88 | 8.58 | 5.6 | 22 | 28 |
| M10 | 1.5 | 24.65 | 5.38 | 10.58 | 6.6 | 26 | 32 |
| M12 | 1.75 | 30.65 | 6.95 | 12.7 | 8.75 | 30 | 36 |
| M16 | 2 | 38.8 | 8.95 | 16.7 | 12.9 | 38 | 44 |
Dimensions in millimetres unless stated. Select a row to load its CAD files above.
DIN 603 square neck and thread length
The square neck has side v and height f. The thread length b depends on the bolt length: the table gives it for lengths up to 125 mm and from 125 to 200 mm.
Carriage bolt dimensions
The low round head has no drive: the square neck locks into the wood or a square hole, and the bolt is tightened from the nut. At M8 the head is up to 20.65 mm across and 4.88 mm high, and the neck 8.58 mm square and 5.6 mm deep.
DIN 603 carriage bolts: common questions
- What hole does an M8 carriage bolt need?
- In wood, a round hole of the bolt diameter; the neck pulls into the wood as the nut is tightened. In metal, a square hole that fits the 8.58 mm neck.