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Square neck boltsnearby

**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.

Square neck boltssizes

end of the bolt. • ASME B18.5-1990 does not specify dimensions for the #8 diameter. Data listed for this size is independent of the ASME specification.

Low Carbon Steel Carriage: The square neck is designed to keep the bolt from turning as a nut is tightened. Hot-Dip Galvanized Steel Carriage: Same design advantages as a low carbon carriage bolt but with a thicker protective coating for outdoor use. Often used in outdoor furniture.

Low Carbon Steel Carriage: Round head bolt with a square neck under the head, and a unified thread pitch. Made from low or medium carbon steel. Hot-Dip Galvanized Steel Carriage: Carriage bolt made from low or medium carbon steel with a galvanic zinc finish applied.