Square Head Bolts Description AMK Finish OEM Part # Origin AMK Part # CLICK FOR PRICING 10-32 X .70 SQR HEAD BOLT ZC. 2 pk .0002 Zinc & Wax (BCI) B-15110 5/16-18 X 1 1/4 SQR HEAD BOLT "L" PHOS. 2 pk Phosphate & Oil (QJ) BOLT-SQ05C20 B-15217 5/16-18 X 1 3/8 SQR HEAD BOLT PHOS. 4 pk Phosphate & Oil (LY~) B-13361 5/16-18 X 1 7/16 SEAT TRACK STUD PHOS. 2 pk Phosphate & Oil (OQG) B-11662 3/8-16 X 3.0 SQR HEAD SET SCREW. 2 pk Plain Finish (KGE) 137990, 91964-S B-12557