M6-1.0 x 55mm DIN 931 Class 8.8 Zinc Finish Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 18.0 MILLIMETERS NOMINAL FASTENER LENGTH: 54.4 MILLIMETERS MINIMUM AND 55.6 MILLIMETERS MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 3.1 MILLIMETERS MINIMUM AND 4.1 MILLIMETERS MAXIMUM WIDTH BETWEEN FLATS: 9.8 MILLIMETERS MINIMUM AND 10.0 MILLIMETERS MAXIMUM NOMINAL THREAD DIAMETER: 6.0 MILLIMETERS THREAD PITCH IN MILLIMETERS: 1.0 EXTERNAL THREAD TOLERANCE CLASS: 6G PART NAME ASSIGNED BY CONTROLLING AGENCY: M6 - 1.0 X 55MM 8.8 DIN 931 PART THREAD ZINC HEX CAP SCREW MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: M