Carriage and Timber bolts have no drive, and machine threads for use with a nut.
Carriage heads are large smooth and domed with no drive.
A tempered medium carbon steel. Grade 8 is stronger than grade 5, and is commonly found in high strength automotive applications. Unplated finish.
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Plow bolts are used for attaching the cutting edge of a plow to the plow blade. Slightly domed head.
Bolts with a very large flat head and machine threads for use with a nut.