1/2-13 Machine Bolts Please select your bolt length and quantity from the table below. Head size is 3/4". Yes, we have 8-point sockets. Extra-long and custom length Square Head Machine Bolts, and Stay Bolts, are found on our Long Bolts page.

Lengths, Prices & Quantities

Product Number  Length  Finish  Each  Buy 10  Buy 25  Buy 50  Buy 100                  50SQMB100PL  1"  Plain  $0.40  50SQMB100BO  1"  Black Oxide  $0.44  50SQMB125PL  1-1/4"  Plain  $0.50  50SQMB150PL  1-1/2"  Plain  $0.55  50SQMB175BO  1-3/4"  Black Oxide  $0.60  50SQMB200BO  2"  Black Oxide  $0.65  50SQMB250BO  2-1/2"  Black Oxide  $0.75  50SQMB300BO  3"  Black Oxide  $0.90  50SQMB350PL  3-1/2"  Plain  $1.15  50SQMB400BO  4"  Plain  $1.30  50SQMB450PL  4-1/2"  Plain  $1.55  50SQMB600BO  6"  Black Oxide  $2.10 30 in stock    50SQMB800BO  8"  Black Oxide  $2.85  100 in stock  50SQMB800PL  8"  Plain  $2.75  42 in stock                 If a Quantity has no ADD TO CART button, there is insufficient inventory.