| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | HEX JAM NUT |
| MATERIAL DOCUMENT AND CLASSIFICATION | STM A194 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL ASTM A194 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL-1222 GOVERNMENT SPECIFICATION |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNF |