1/4"-20 x 2-1/2" Grade 5 Yellow Zinc Finish Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.750 INCHES NOMINAL FASTENER LENGTH: 2.500 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM NOMINAL THREAD DIAMETER: 0.25 INCHES THREAD QUANTITY PER INCH: 20 MINIMUM TENSILE STRENGTH: 120000 POUNDS PER SQUARE INCH CHAMFER ANGLE: 15.0 DEGREES MINIMUM AND 30.0 DEGREES MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: HEX CAP SCREW, UNC-2A CARBON STEEL, YELLOW ZINC PLATED SAE J429, GRADE A5 SPECIAL FEATURES: WIDTH ACROSS CORNERS MIN. 0.428 MAX 0.505 COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL AND STEEL CORROSION RESISTING MATERIAL DOCUMENT AND CLASSIFICATION: SAE J995 NATIONAL STD SINGLE MATERIAL RESPONSE OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F 1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNC