3/8-16 Machine Bolts Please select your bolt length and quantity from the table below. Head size is 9/16", 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                  37SQMB050BO  1/2"  Black Oxide  $0.17  37SQMB075BO  3/4"  Black Oxide  $0.19  37SQMB100BO  1"  Black Oxide  $0.21  37SQMB100PL  1"  Plain  $0.20  37SQMB125BO  1-1/4"  Black Oxide  $0.24  50 in stock  37SQMB125PL  1-1/4"  Plain  $0.24  37SQMB150BO  1-1/2"  Black Oxide  $0.30  37SQMB150PL  1-1/2"  Plain  $0.27  37SQMB175BO  1-3/4"  Black Oxide  $0.30  78 in stock  37SQMB175PL  1-3/4"  Plain  $0.29  75 in stock  37SQMB200PL  2"  Plain  $0.30  37SQMB225BO  2-1/4"  Black Oxide  $0.32  37SQMB275PL*  2-3/4"  Plain  $0.36  37SQMB300BO  3"  Black Oxide  $0.42  37SQMB325PL  3-1/4"  Plain  $0.44  60 in stock  37SQMB350BO  3-1/2"  Black Oxide  $0.48  37SQMB350PL  3-1/2"  Plain  $0.46  37SQMB400BO  4"  Black Oxide  $0.50  37SQMB450BO  4-1/2"  Black Oxide  $0.54  37SQMB500BO  5"  Black Oxide  $0.65  190 in stock  37SQMB500PL  5"  Plain  $0.60  65 in stock  37SQMB550BO  5-1/2"  Black Oxide  $0.75  200 in stock  37SQMB550PL  5-1/2"  Plain  $0.70  35 in stock                     If a Quantity has no ADD TO CART button, there is insufficient inventory.