5/8" Shoulder x 5" Shoulder Length x 1/2"-13 Black Oxide/Plain Finish Alloy Steel Socket Shoulder Bolt / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.750 INCHES NOMINAL FASTENER LENGTH: 5.750 INCHES NOMINAL HEAD STYLE: C67 KNURLED NO. 2 HEAD DIAMETER: 0.875 INCHES NOMINAL HEAD HEIGHT: 0.375 INCHES NOMINAL SHOULDER DIAMETER: 0.005 INCHES NOMINAL INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 0.500 INCHES WIDTH ACROSS FLATS: 0.313 INCHES NOMINAL THREAD QUANTITY PER INCH: 13 SPECIAL FEATURES: ROCKWELL HARDNESS C32-43 MATERIAL: STEEL OVERALL THREAD SERIES DESIGNATOR: UNC