1/4"-28 x 1/2" Cup Point Plain Finish Case Hardened Steel Square Head Set Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.500 INCHES NOMINAL FASTENER LENGTH: 0.500 INCHES NOMINAL HEAD STYLE: C13 SQUARE HEAD HEIGHT: 0.196 MILLIMETERS NOMINAL WIDTH BETWEEN FLATS: 0.250 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: MRAP BUFFALO A1; MRAP BUFFALO MK2A2 NOMINAL THREAD DIAMETER: 0.250 INCHES THREAD QUANTITY PER INCH: A28 SPECIAL FEATURES: CASE HARDENED STEEL; PLAIN CUP MATERIAL: STEEL OVERALL SURFACE TREATMENT: OIL OVERALL THREAD SERIES DESIGNATOR: UNF