1/4"-20 x 1" ASTM F835 Hex Drive Zinc Finish Alloy Steel Button Socket Cap Screw / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM FASTENER LENGTH: 1.000 INCHES NOMINAL HEAD STYLE: C30 BUTTON HEAD DIAMETER: 0.419 INCHES MINIMUM AND 0.437 INCHES MAXIMUM HEAD HEIGHT: 0.122 INCHES MINIMUM AND 0.132 INCHES MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 0.250 INCHES WIDTH ACROSS FLATS: 0.158 INCHES NOMINAL THREAD QUANTITY PER INCH: 20 PART NAME ASSIGNED BY CONTROLLING AGENCY: 1/4-20X1 INCH ZINC PLATED BUTTON HEAD SOCKET CAP SCREW SPECIAL FEATURES: MATERIAL AND MECHANICAL PROPERTIES ASTM F 835 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNRC