Pursuant to Federal and State Nexus tax laws, several states, that we ship products to, have requested we pay their state sales tax. 

On November 1. 2020 Blacksmiths Depot will begin collecting taxes for those states.

5/16-18 x 1/2" machine Bolts

In stock
Only 5 left
5/16" Square head machine Bolts in black zinc finish
Item #
123bz-macbolt
$0.30
5/16-18 x 1/2" machine Bolts is available to buy in increments of 10
5/16" Square head machine Bolts in black zinc finish
5/16" Square head machine Bolts in black zinc finish
5/16" Square head machine Bolts in black zinc finish

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 5/8"
finish coating Black Zinc
package quantity 10/pk.
Write Your Own Review
You're reviewing:5/16-18 x 1/2" machine Bolts
Your Rating