M5-0.8 x 20mm ISO 7380 Hex Drive Class 10.9 Zinc Finish Alloy Steel Button Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 18.4 MILLIMETERS NOMINAL FASTENER LENGTH: 20.0 MILLIMETERS NOMINAL HEAD STYLE: C30 BUTTON HEAD DIAMETER: 9.14 MILLIMETERS MINIMUM AND 9.50 MILLIMETERS MAXIMUM HEAD HEIGHT: 2.50 MILLIMETERS MINIMUM AND 2.75 MILLIMETERS MAXIMUM INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 5.0 MILLIMETERS WIDTH ACROSS FLATS: 3.02 MILLIMETERS MINIMUM AND 3.08 MILLIMETERS MAXIMUM THREAD PITCH IN MILLIMETERS: 0.8 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