Description:
The Carriage Bolt is distinguished from other bolts by its head: the shank of the bolt is circular for most of its length, as usual, but the portion immediately beneath the head is formed into a square section. This makes the bolt self-locking when placed through a square hole or in most wood. This allows the fastener to be installed with only a single tool working from one side. The head of a carriage bolt is usually a shallow dome. The squared section is of the same size as the diameter of the bolt shank, with a plain unthreaded shank. Carriage bolts were developed for use through iron strengthening plates on either side of a wooden beam. It is commonplace though to use them into bare timber, the squared section giving enough grip to prevent rotation.
Material:
- Steel
- Stainless Steel
- Brass
- Aluminum
Grades:
- Low carbon
- Grade 5
- Grade 8
- 316 stainless
- 18-8 stainless
Markings:
There are markings for graded fasteners.
Plating:
- Zinc (Blue or Yellow)
- No Plating/ Plain (Plain Steel)
How to measure:
- Effective length
- Diameter of threads
Application/ Jargon:
- Bumper Bolt
- Coach Bolt
- Round Head Square Bolt
Part number prefix:
- 0CB*(steel)
- 1CB*(stainless steel)
- 2CB*(brass)
- 3CB*(aluminum)
Style/ Types:
- Square neck
- Oval neck
- Fin neck
- Stripper bolt