| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.615 INCHES MINIMUM AND |
| 0.635 INCHES MAXIMUM |
| FASTENER LENGTH | 1.000 INCHES MINIMUM AND |
| 1.010 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1137 OR |
| STEEL COMP 1139 OR |
| STEEL COMP 1140 OR |
| STEEL COMP 1141 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AISI/SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 50.0 ROCKWELL C MINIMUM AND |
| 55.0 ROCKWELL C MAXIMUM HEAD |
| HEAD STYLE | TEE NO. 3 |
| HEAD HEIGHT | 0.177 INCHES MINIMUM AND |
| 0.197 INCHES MAXIMUM |
| HEAD LENGTH | 0.490 INCHES MINIMUM AND |
| 0.510 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.365 INCHES MINIMUM AND |
| 0.385 INCHES MAXIMUM |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |