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4-1/2", 9, US

US Fasteners

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.
Socket product

Socket screws

Screws with an Allen wrench drive.
Shoulder bolt

Shoulder bolts

Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.