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5/16-18 x 3.5" machine Bolts

In stock
5/16" Square head machine Bolts
Item #
5/16-18 x 3.5" machine Bolts is available to buy in increments of 10
5/16" Square head machine Bolts
5/16" Square head machine Bolts
5/16" Square head machine Bolts

Great Old-Fashioned Square head Machine Bolts for a much more traditional look.  Some of the machine bolts we sell are old stock and finish can vary from flat to glossy

500 piece discount = 20% off

1000 piece discount = 30% off

  • Black Oxide, followed by an appropriate post-treatment, provides limited added corrosion protection to the surface of the metal, prolonging service and increasing the shelf-life of stored parts. 

Standard Thread Length - If you have a specific thread length you need please call to verify.  The minimum thread length shall be equal to one-half the nominal screw length plus 1/2" or 6”, whichever is less. However some of our stock is truly custom and therefore please call if you need a specific thread length.

More Information
shank diameter 5/16
thread 5/16-18
length below head 3.5"
finish coating Black Oxide
package quantity 10/pk.
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