Standard, Shoulder Screw, Alloy Steel, 5/8 in Shoulder Dia., 2 3/4 in Shoulder Length, 1/2-13/ THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND SHOULDER DIAMETER: 0.625 INCHES NOMINAL SHOULDER LENGTH: 2.750 INCHES NOMINAL NOMINAL THREAD DIAMETER: 0.500 INCHES THREAD QUANTITY PER INCH: 13 MATERIAL: STEEL OVERALL THREAD SERIES DESIGNATOR: UNC