STUD BOLTS,THREADED ENTIRE LENGTH, ASTM A193 GR.B7 3/4" X 4 1/2" WITH TWO HEXAGONAL HEAVY TYPE NUTS ASTM A194 GR.2H NUTS DIMENSIONS AS PER ASME B 18.2.2 THREADS PER ASME B1.1,CL 2A&2B FIT ELECTRO ZINC PLATED 640 pcs.