#821228 Spec Diameter Thread Threads Length Grade Finish Weight 0.3125 (5/16) Full 18 0.5 (1/2) Grade 5 Zinc Nickel .0273 Diameter 0.3125 (5/16) Thread 18 Length 0.5 (1/2) Grade Grade 5 Finish Zinc Nickel Weight .0273 Need Something Custom?