5/8"-18 x 1-1/4" Grade 8 Plain Finish Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 1.25 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD DIAMETER: 0.937 INCHES NOMINAL NOMINAL THREAD DIAMETER: 18.0 INCHES PART NAME ASSIGNED BY CONTROLLING AGENCY: CAP SCREW;HEX BOLT SPECIAL FEATURES: GRADE 8;PLAIN;FNL;TELESCOPE RMU MATERIAL: STEEL CORROSION RESISTING FASTENER THREAD SERIES DESIGNATOR: UNF