| COUNTERBORE DIAMETER | 0.183 INCHES MINIMUM AND 0.193 INCHES MAXIMUM FIRST END |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-626,ALLOY 385,1/2H FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | COPPER ALLOY OVERALL |
| NOMINAL THREAD SIZE | 0.164 INCHES |
| NUT COUNTERBORE DEPTH | 0.214 INCHES MINIMUM AND 0.224 INCHES MAXIMUM FIRST END |
| NUT DIAMETER | 0.309 INCHES MINIMUM AND 0.315 INCHES MAXIMUM |
| NUT HEIGHT | 0.312 INCHES NOMINAL |
| NUT STYLE | SPLINE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| PILOT DIAMETER | 0.228 INCHES MINIMUM AND 0.231 INCHES MAXIMUM |
| PILOT LENGTH | 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-N-290,CLASS1,TYPE 6 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | NICKEL OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 32 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |