M8-1.25 x 40mm ISO 7380 Class 10.9 Zinc Finish Alloy Steel Button Socket Cap Screw - Full Thread / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 40.0 MILLIMETERS NOMINAL FASTENER LENGTH: 40.0 MILLIMETERS NOMINAL HEAD STYLE: C30 BUTTON HEAD DIAMETER: 13.5 MILLIMETERS MINIMUM AND 14.0 MILLIMETERS MAXIMUM HEAD HEIGHT: 4.1 MILLIMETERS MINIMUM AND 4.4 MILLIMETERS MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 8.0 MILLIMETERS WIDTH ACROSS FLATS: 5.0 MILLIMETERS MINIMUM AND 5.1 MILLIMETERS MAXIMUM THREAD PITCH IN MILLIMETERS: 1.25 EXTERNAL THREAD TOLERANCE CLASS: 6G PART NAME ASSIGNED BY CONTROLLING AGENCY: BUTTON SOCKET CAP SCREW SPECIAL FEATURES: MATERIAL CLASS 10.9 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: M