| COLOR | BLACK OVERALL |
| FASTENER LENGTH | 20.0 MILLIMETERS NOMINAL |
| HEAD DIAMETER | 13.57 MILLIMETERS MINIMUM AND 14.00 MILLIMETERS MAXIMUM |
| HEAD HEIGHT | 4.1 MILLIMETERS MINIMUM AND 4.4 MILLIMETERS MAXIMUM |
| HEAD STYLE | BUTTON |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTMF568M ASSN STD SINGLE MATERIAL RESPONSE OR ISO898-1 INTERNATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL PROPERTY CLASS 10.9 OVERALL |
| NOMINAL THREAD DIAMETER | 8.0 MILLIMETERS |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCR,BTN,SOC,TAB, M8 C10.9 MB |
| WIDTH ACROSS FLATS | 5.02 MILLIMETERS MINIMUM AND 5.08 MILLIMETERS MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | D60, TYPE 1 PER F-100 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE ZINC OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 17.5 MILLIMETERS NOMINAL |
| THREAD PITCH IN MILLIMETERS | 1.25 |
| THREAD SERIES DESIGNATOR | M |