Carriage Bolts from Bolt Products

Carriage Bolts
Carriage bolts
Domed top with square under head.
Carriage bolts are mostly used in wood, and are also 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 is tightened for a very secure fit.

Available in a variety of diameters, carriage bolts are a common choice for any job. Carriage bolts are made from a variety of materials and different grades of steel to accommodate the abundance of applications in which they are used. Below are a few of the most common types of carriage bolts.
  • 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 carriage bolts work with galvanized nuts for exterior use in the coastal areas.
Other bolt types available from Bolt Products, Inc: :

• Anchor bolts - extended connections with handle
• Flange bolts - ridge around the bolt head
• Hex bolts - hex head of various materials
• Hex tap bolts - trimmed hex head with no flange
• Lag bolts - screw like pointed end
• Machine bolts - fine or coarse threads
• Metric bolts - available in Hex/Standard/Flange type
• Shoulder bolts - allow slide or pivot
• Square neck bolts - square or domed top with square under head

No matter what bolt type you require please do not hesitate to contact us at 1-800-423-6503 or email

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