Friday, November 1, 2013
What Is a Carriage Bolt Assembly
Carriage bolt assemblies are threaded fasteners with a bolt that has a rounded, dome-shaped head. The bolt has a square neck that extends from the head towards the threads. A regular hex nut or wing nut allows the assembly to hold the components together. This assembly can be tightened with just one wrench.
Function
When used in metalworking applications, carriage bolts are often called plow bolts. These bolts must go through a square opening to accommodate the neck, which will keep the bolt from turning when the assemblys nut is tightened.
Considerations
Carriage bolt assemblies are commonly used in carpentry and construction; they are well-suited for fastening two structural wood pieces together, especially when extra strength is required. The square neck sinks into the wood as the fastener is tightened, preventing the bolt from turning and countersinking the bolt head at the same time.
Types
Carriage bolt assemblies are available in varying degrees of hardness, or grades. Grades three, five and eight are common strengths. Zinc is the most common coating for a carriage bolt. They are also available in silicon bronze.
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