Our offices and shop will be closed on Sept. 30 - Oct. 1 and again on Oct. 9..  We will still be shipping these days but will not be available by phone, or email.

We will not be able to do any walk-in sales these days

5/16" Square Head Machine Bolts

Great black 5/16 inch bolts with square heads

  • 5/16-18 threading

Do you need the NUTs to go with these

**Call for specific thread lengths on square head machine bolts

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