Rule Company, Inc.

Carriage bolts

A bolt mostly used in wood with a domed top and a square under the head. This pulls into the wood as the nut is tightened.

Available bolt material:

Material	Description
Zinc plated steel	Steel is zinc plated for moderate protection against rust.
Steel grade 5	Made from medium carbon steel. Used in automotive applications and where higher strength is desired.
Stainless steel 18-8	Stainless steel 18-8 is an alloy of steel with high corrosion resistance. Stainless has become the material of choice for exterior and most marine applications.
Silicon Bronze	Bronze is an alloy of copper with greater strength and corrosion resistance than brass. Most commonly used in wood boat building and restoration.
Hot dipped galvanized	Hot dipped galvanized fasteners are much more corrosion resistant than zinc plated fasteners. Due to the thickness of the galvanized coating, galvanized bolts will only work with galvanized nuts. For exterior and coastal area use. (ASTM A153)