5/16-18 x 6" 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.