M8-1.25 x 55mm ISO 4762/DIN 912 Hex Drive Class 12.9 Zinc Finish Alloy Steel Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 28.0 MILLIMETERS NOMINAL FASTENER LENGTH: 62.83 MILLIMETERS MINIMUM AND 63.00 MILLIMETERS MAXIMUM HEAD STYLE: C100 KNURLED NO. 5 HEAD DIAMETER: 12.70 MILLIMETERS MINIMUM AND 13.00 MILLIMETERS MAXIMUM HEAD HEIGHT: 7.83 MILLIMETERS MINIMUM AND 8.00 MILLIMETERS MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 8.0 MILLIMETERS THREAD PITCH IN MILLIMETERS: 1.25 MATERIAL: ZINC ALLOY OVERALL THREAD SERIES DESIGNATOR: M