| THREAD SERIES DESIGNATOR | M |
| NOMINAL THREAD DIAMETER | 20.0 MILLIMETERS |
| THREAD PITCH IN MILLIMETERS | 2.5 |
| EXTERNAL THREAD TOLERANCE CLASS | 6G |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 52.0 MILLIMETERS NOMINAL |
| FASTENER LENGTH | 180.0 MILLIMETERS NOMINAL |
| MATERIAL | STEEL UNS K03104 OVERALL |
| SURFACE TREATMENT | ZINC AND |
| CHROMATE OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 29.5 MILLIMETERS MINIMUM AND |
| 30.0 MILLIMETERS MAXIMUM |
| HEAD HEIGHT | 19.7 MILLIMETERS MINIMUM AND |
| 20.0 MILLIMETERS MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 17.0 MILLIMETERS NOMINAL |
| SPECIAL FEATURES | UNDRILLED HEAD; OPTIONAL-TYPE SELF LOCKING ELEMENT |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW CAP HEX SOCKET HEAD |