Carriage Bolts
Carriage Bolts
Carriage bolts (round head with a square neck) are
commonly used in wood connections. The square
neck under the round head will seat into the hole in
the wood to prevent the head from turning. Because
they are used with wood, carriage bolts are rarely
high strength and virtually always supplied in a
standard ASTM A307 specification.
Standard Thread Length
Bolt lengths ≤ 6′′: Thread length = (2 X diameter) + 1/4′′
Bolt lengths > 6′′: Thread length = (2 X diameter) + 1/2′′
CARRIAGE BOLTS
Steel
Plain or Plated
Without Nuts
| DIAMETER THREAD | ||||||||
|---|---|---|---|---|---|---|---|---|
| LENGTH | 3⁄16 | 1⁄4 | 5⁄16 | 3⁄8 | 7⁄16 | 1⁄2 | 5⁄8 | 3⁄4 |
| 1⁄2 | S | S | S | |||||
| 5⁄8 | S | S | ||||||
| 3⁄4 | S | S | S | |||||
| 1 | S | S | S | S | S | S | ||
| 1 1⁄4 | S | S | S | S | S | S | ||
| 1 1⁄2 | S | S | S | S | S | S | S | |
| 1 3⁄4 | S | S | S | S | S | S | ||
| 2 | S | S | S | S | S | S | S | S |
| 2 1⁄4 | S | S | S | S | S | S | ||
| 2 1⁄2 | S | S | S | S | S | S | S | S |
| 2 3⁄4 | S | S | S | S | S | |||
| 3 | S | S | S | S | S | S | S | S |
| 3 1⁄4 | S | S | S | |||||
| 3 1⁄2 | S | S | S | S | S | S | S | S |
| 4 | S | S | S | S | S | S | S | S |
| 4 1⁄2 | S | S | S | S | S | S | S | S |
| 5 | S | S | S | S | S | S | S | |
| 5 1⁄2 | S | S | S | S | S | S | S | |
| 6 | S | S | S | S | S | S | S | |
| 6 1⁄2 | S | S | S | S | S | S | S | |
| 7 | S | S | S | S | S | S | S | |
| 7 1⁄2 | S | S | S | S | S | S | S | |
| 8 | S | S | S | S | S | S | S | |
| 8 1⁄2 | S | S | S | S | ||||
| 9 | S* | S* | S* | S* | S* | S* | ||
| 10 | S* | S* | S* | S* | S* | S* | ||
| 11 | S* | S* | S* | |||||
| 12 | S* | S* | S* | S* | S* | |||
| 13 | S* | |||||||
| 14 | S* | |||||||
| 15 | S* | |||||||
| 16 | S* | |||||||