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5/16" x 4-1/2", Silicon bronze

US Fasteners, 5/16" x 4-1/2", Silicon bronze

Hex bolt

Hex bolts

Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.

Carriage bolt

Carriage bolts & Plow bolts

Bolts with no drive and machine threads for use with a nut.

Lag bolt

Lag bolts

Large wood screws technically called lag screws.