M8-1.25 x 40mm DIN 931 Class 8.8 Zinc Finish Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 21.50 MILLIMETERS MINIMUM AND 22.50 MILLIMETERS MAXIMUM FASTENER LENGTH: 44.65 MILLIMETERS MINIMUM AND 45.95 MILLIMETERS MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 5.15 MILLIMETERS MINIMUM AND 5.45 MILLIMETERS MAXIMUM WIDTH BETWEEN FLATS: 12.73 MILLIMETERS MINIMUM AND 13.00 MILLIMETERS MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: HEX CAP SCREW, M8-1.25X40MM SPECIAL FEATURES: WRENCH SIZE-13MM, WEIGHT- 0.0447, PARTIAL THREAD- COARSE MATERIAL: STEEL PROPERTY CLASS 8.8 OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: ISO M