5/8"-18 x 2-3/4" Grade 8 Yellow Zinc Finish Hex Cap Screw / THREAD CLASS: 2A THREAD LENGTH: 2.75 INCHES NOMINAL FASTENER LENGTH: 3.153 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD DIAMETER: 1.083 INCHES NOMINAL HEAD HEIGHT: 0.403 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.938 INCHES NOMINAL END ITEM IDENTIFICATION: 2350-01-627-2944 NOMINAL THREAD DIAMETER: 0.625 INCHES THREAD QUANTITY PER INCH: 18 PART NAME ASSIGNED BY CONTROLLING AGENCY: SCREW, CAP, HEXAGON, HEAD COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNF