M16-2.0 x 30mm ISO 4762 Hex Drive Class 12.9 Black Oxide Finish Alloy Steel Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 30.0 MILLIMETERS NOMINAL FASTENER LENGTH: 30.0 MILLIMETERS NOMINAL HEAD STYLE: C49 FLAT CHAMFER HEAD DIAMETER: 24.0 MILLIMETERS MAXIMUM HEAD HEIGHT: 16.0 MILLIMETERS MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 16.0 MILLIMETERS WIDTH ACROSS FLATS: 14.0 MILLIMETERS NOMINAL THREAD PITCH IN MILLIMETERS: 2.0 MATERIAL: STEEL PROPERTY CLASS 12.9 OVERALL THREAD SERIES DESIGNATOR: M