| FASTENER LENGTH | 0.059 INCHES MINIMUM AND 0.061 INCHES MAXIMUM |
| HARDNESS RATING | 34.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.435 INCHES NOMINAL |
| HEAD HEIGHT | 0.250 INCHES NOMINAL |
| HEAD STYLE | KNURLED NO. 1 |
| INTERNAL DRIVE STYLE | FOUR SPLINE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.060 INCHES |
| POINT STYLE | CUP |
| SPLINE MAJOR DIAMETER | 0.034 INCHES MINIMUM AND 0.035 INCHES MAXIMUM |
| SPLINE MINOR DIAMETER | 0.0255 INCHES MINIMUM AND 0.0265 INCHES MAXIMUM |
| SPLINE WIDTH | 0.0115 INCHES MINIMUM AND 0.0120 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.059 INCHES MINIMUM AND 0.061 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 80 |
| THREAD SERIES DESIGNATOR | UNF |