5/8"-18 x 3" Grade 8 Yellow Zinc Finish Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.50 INCHES NOMINAL FASTENER LENGTH: 2.90 INCHES MINIMUM AND 3.00 INCHES MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM END ITEM IDENTIFICATION: MRAP-BUFFALO A1 NOMINAL THREAD DIAMETER: 0.625 INCHES THREAD QUANTITY PER INCH: 18 PART NAME ASSIGNED BY CONTROLLING AGENCY: 5/8-18X3, HEX CAP SCREW, GRADE 8, YELLOW ZINC COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNF