5/16"-18 x 1" Zinc Finish SAE J429 Grade 8 Hex Serrated Flange Bolt / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.0 INCHES NOMINAL HEAD STYLE: C1 HEXAGON END ITEM IDENTIFICATION: MRAP MAXXPRO LWB AMBULANCE W/OGPK PART NAME ASSIGNED BY CONTROLLING AGENCY: SERRATED FLANGE BOLT SPECIAL FEATURES: ROHS COMPLAINT; THREAD SIZE - 18; WRENCH SIZE 0.500 INCH; THREAD COARSE; HEAD HEXAGON GRADE 8; DIAMETER THREAD SIZE 0.312 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL