| BEARING SURFACE TYPE | FLAT |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| NUT STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM D4066, GROUP-01, CL-1, GR-1 ASSN STD SINGLE MATERIAL RESPONSE LOCKING INSERT |
| MATERIAL | PLASTIC NYLON LOCKING INSERT |
| MATERIAL | STEEL COMP 1137 NUT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT, SELF-LOCKING, HEXAGON (MS17829Z4C MOD) |
| SPECIAL FEATURES | NOTE 1221 ITEM CONTAINS THE HAZARDOUS MATERIAL CHROMIUM METAL AND/OR COMPOUNDS |
| WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SURFACE TREATMENT | ZINC NUT |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |