1/2"-13 x 2-1/2" Phosphate and Oil Finish SAE J429 Grade 8 Hex Flange Bolt / FASTENER LENGTH: 2.5 INCHES NOMINAL HEAD STYLE: C1 HEXAGON END ITEM IDENTIFICATION: 2541-01-648-8154 NOMINAL THREAD DIAMETER: 0.500 INCHES FEATURES PROVIDED: WASHER THREAD QUANTITY PER INCH: 13 PART NAME ASSIGNED BY CONTROLLING AGENCY: BOLT,HEX FLANGE SPECIAL FEATURES: GRADE 8 MATERIAL: STEEL OVERALL SURFACE TREATMENT: OIL OVERALL AND PHOSPHATE SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASME B18.2.1, SAE J429, ASTM F788 INTERNATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL THREAD SERIES DESIGNATOR: UNC