Socket Set Screw, Cup, 1/4 in Overall Length, 1/4-20, Alloy Steel, Black Oxide, PK 100/ THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 0.250 INCHES NOMINAL HEAD STYLE: C101 HEADLESS (SETSCREW) POINT DIAMETER: 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM POINT STYLE: F19 FLAT INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: TOOLS NOMINAL THREAD DIAMETER: 0.250 INCHES WIDTH ACROSS FLATS: 0.125 INCHES NOMINAL THREAD QUANTITY PER INCH: 20 MATERIAL: STEEL OVERALL THREAD SERIES DESIGNATOR: UNC