| THREAD SERIES | ISO M |
| NOMINAL THREAD SIZE | 28.0 MILLIMETERS |
| THREAD PITCH IN MILLIMETERS | 1.00 |
| THREAD TOLERANCE CLASS | 6H INTERNAL |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | ALUMINUM ALLOY 2017 OR |
| ALUMINUM ALLOY 2024 OR |
| ALUMINUM ALLOY 6061 OVERALL |
| SURFACE TREATMENT | ANODIZE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-A-8625,TY 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| NUT HEIGHT | 3.17 MILLIMETERS MINIMUM AND |
| 3.62 MILLIMETERS MAXIMUM |
| WIDTH ACROSS FLATS | 32.91 MILLIMETERS MINIMUM AND |
| 36.00 MILLIMETERS MAXIMUM |
| HOLE CONFIGURATION STYLE | CONFIGURATION B |
| HOLE TYPE AND QUANTITY | 3 DRILLED |
| DRILLED HOLE DIAMETER | 1.5 MILLIMETERS NOMINAL |
| SPECIAL FEATURES | BEARING SURFACE TYPE CHAMFERED |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81349 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | D38999/28-4C |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MIL-DTL-38999/28 |