M5-0.8 x 20mm DIN 7991 Hex Drive Class 10.9 Zinc Finish Alloy Steel Flat Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 20.0 MILLIMETERS NOMINAL HEAD STYLE: C50 FLAT COUNTERSUNK HEAD DIAMETER: 9.6 MILLIMETERS MINIMUM AND 10.0 MILLIMETERS MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 5.0 MILLIMETERS WIDTH ACROSS FLATS: 3.0 MILLIMETERS MINIMUM AND 3.1 MILLIMETERS MAXIMUM THREAD PITCH IN MILLIMETERS: 0.8 EXTERNAL THREAD TOLERANCE CLASS: 6G COUNTERSINK ANGLE: 90.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: FLAT HEAD SOCKET CAP SCREW SPECIAL FEATURES: MATERIAL CLASS 10.9 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: M