5/8"-11 x 1-3/4" ASTM F835 Hex Drive Black Oxide Finish Alloy Steel Flat Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 1.75 INCHES NOMINAL HEAD DIAMETER: 0.625 INCHES NOMINAL THREAD QUANTITY PER INCH: 11 SPECIAL FEATURES: FLAT HEAD SOCKET CAP SCREW;DRIVE 0.375;FNL;BLACK OXIDE THREAD SERIES DESIGNATOR: UNC