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External hex, 1/2" x 5-1/2", 18-8, US

US Fasteners, External hex, 1/2" x 5-1/2", 18-8

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.