5/16"-18 x 1-1/4" Grade 8 Yellow Zinc Finish Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.875 INCHES NOMINAL FASTENER LENGTH: 1.210 INCHES MINIMUM AND 1.250 INCHES MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM END ITEM IDENTIFICATION: MRAP - COUGAR AMBULANCE; MRAP - COUGAR NOMINAL THREAD DIAMETER: 0.312 INCHES THREAD QUANTITY PER INCH: 18 PART NAME ASSIGNED BY CONTROLLING AGENCY: 5/16-18X1 1/4 INCHES GRADE 8 YELLOW ZINC HEX CAP SCREW SPECIAL FEATURES: MATERIAL STEEL GRADE 8 COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL PROPRIETARY CHARACTERISTICS: NPAC SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC