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Carriage bolts are mostly used in wood and may also be known as plow bolts. They have a domed top and a square under the head. The carriage bolt square pulls into the wood as the nut in tightened for a very secure fit. Available in a variety of diameters, plow bolts are a common choice for any job.
Carriage bolts are made from a variety of types and grades of steel to suffice for the abundance of applications in which they are used. Below are just a few of the common plow bolt types.
- Zinc-plated bolts: Moderate protection against rust.
- Steel grade 5 bolts: Medium carbon steel; used in high-strength automotive applications.
- Stainless steel 18-8 bolts: This material of choice for exterior and marine applications is produced from an alloy of steel with a high corrosion resistance.
- Silicone bronze bolts: Used in wood boat building this alloy of copper has better strength and corrosion resistance than brass.
- Hot dipped galvanized bolts: Much more corrosion resistant than zinc-plated. These thick coated bolts work with galvanized nuts for exterior use in the coastal areas.
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