| THREAD SERIES DESIGNATOR | M |
| NOMINAL THREAD DIAMETER | 4.0 MILLIMETERS |
| THREAD PITCH IN MILLIMETERS | 0.7 |
| EXTERNAL THREAD TOLERANCE CLASS | 6G |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 20.0 MILLIMETERS MINIMUM AND |
| 23.5 MILLIMETERS MAXIMUM |
| FASTENER LENGTH | 16.0 MILLIMETERS MINIMUM AND |
| 24.0 MILLIMETERS MAXIMUM |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 6.8 MILLIMETERS MINIMUM AND |
| 7.0 MILLIMETERS MAXIMUM |
| HEAD HEIGHT | 3.88 MILLIMETERS MINIMUM AND |
| 4.00 MILLIMETERS MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 3.0 MILLIMETERS NOMINAL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |