Socket Set Screw, Cup, 1/2 in Overall Length, 1/2-13, Alloy Steel, Black Oxide, PK 50/ THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.50 INCHES NOMINAL FASTENER LENGTH: 0.50 INCHES NOMINAL HEAD STYLE: C101 HEADLESS (SETSCREW) POINT STYLE: F12 CUP INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 0.50 INCHES THREAD QUANTITY PER INCH: 13 HARDNESS RATING: 45.0 ROCKWELL C MINIMUM OVERALL AND 53.0 ROCKWELL C MAXIMUM SPECIAL FEATURES: GRANGER HOLDS DESIGN CONTROL MATERIAL: STEEL OVERALL THREAD SERIES DESIGNATOR: UNC