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5/16-18 Grade 2 Square Nuts Plain. While hex nuts remain incredibly popular, you can accomplish a lot with these four-sided internally threaded nuts with flat bottom side and a chamfered, washer-crowned top. Designed primarily for use with square bolts, these nuts take up a larger surface area, which produces more contact with the part being fastened to increase resistance against gradual loosening.
5/16-18 Grade 2 Square Nuts Plain
$0.16
Reliable shipping
Flexible returns