| THREAD SERIES | ISO M |
| NOMINAL THREAD SIZE | 18.0 MILLIMETERS |
| THREAD PITCH IN MILLIMETERS | 1.50 |
| THREAD PITCH DIAMETERS | 17.026 TO 17.187 MILLIMETERS |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP 4340 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| NUT STYLE | NON-FLOATING SELF-LOCKING BARREL |
| NUT DIAMETER | 30.71 MILLIMETERS MINIMUM AND |
| 30.96 MILLIMETERS MAXIMUM |
| NUT LENGTH | 30.710 MILLIMETERS MINIMUM AND |
| 31.210 MILLIMETERS MAXIMUM |
| BARREL HEIGHT | 18.770 MILLIMETERS NOMINAL |
| NUT HEIGHT | 24.940 MILLIMETERS MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| NUT COUNTERBORE DEPTH | 4.73 MILLIMETERS MINIMUM AND |
| 5.33 MILLIMETERS MAXIMUM NUT |
| COUNTERBORE DIAMETER | 18.00 MILLIMETERS MINIMUM AND |
| 19.05 MILLIMETERS MAXIMUM NUT |