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5/16" x 3-1/2", US, Zinc, Hex

US Fasteners, 5/16" x 3-1/2", Zinc, Hex

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.

Lag bolt

Lag bolts

Large wood screws technically called lag screws.