5/8"-11 x 3-1/2" Grade 8 Yellow Zinc Finish Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.500 INCHES NOMINAL FASTENER LENGTH: 3.450 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.391 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.930 INCHES NOMINAL END ITEM IDENTIFICATION: R19TM900GPMFL NOMINAL THREAD DIAMETER: 0.625 INCHES THREAD QUANTITY PER INCH: 11 PART NAME ASSIGNED BY CONTROLLING AGENCY: HEX CAP SCREW, GRADE 8, YELLOW ZINC COLOR: YELLOW OVERALL MATERIAL: STEEL COMP 4140 OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: SAE J429 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: UNC