Machine Screws - 12 Point Head Description AMK Finish OEM Part # Origin AMK Part # CLICK FOR PRICING 5/16-18 X 7/8 12 PT .75 CONI SEMS PHOS. 6 pk Phosphate & Oil (KRI) 3979949 B-11917 5/16-18 X 7/8 12 PT .75 CONI SEMS PHOS. 12 pk Phosphate & Oil (KRI) 3979949 B-13452 5/16-18 X 1 1/2 GR8 12PT FLNG BOLT PHOS. 4 pk Phosphate & Oil (LWQ) 390214-S2 B-10098 3/8-16 X 1.25 GR5 12 PT FLNG BOLT ZC. 2 pk Electrolytic Zinc & Wax (PIA) 539485 B-13948 1/2-13 X 1 1/2 FLNG BOLT 12PT NYLOK. 1 pk Plain Finish & Nylon Lock (PPN) 9427314 B-15013