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1/4" x 4-1/2", US, Hex head

US Fasteners, 1/4" x 4-1/2", Hex head

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.