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4-1/2", Zinc plated steel, US, 7

US Fasteners, 4-1/2", Zinc plated steel, 7

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.