1/2-13 x 4 Square Head Machine Bolts/Steel/Plain (Carton: 100 pcs) by Newport Fasteners at Sunny Doors. MPN: 788359. Hurry! Limited time offer. Offer valid only while supplies last. Offers Greater bearing surface for wrenching than hex head bolts. Externally Threaded mechanical device with a trimmed square shaped external wrenching head.Square Machine Bolts. Manufactured to ASME B18.2.1 specifications. Tensile Strength - 60,000 psi. min.. Low Carbon Steel / Plain Finish.
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