| BEARING SURFACE TYPE | CHAMFERED |
| COUNTERSINK ANGLE | 90.0 DEGREES MINIMUM AND 120.0 DEGREES MAXIMUM FIRST END |
| HARDNESS RATING | 201.0 BRINELL STANDARD MINIMUM AND 255.0 BRINELL STANDARD MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS S113 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | DTD 904 NATIONAL SPEC ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | LEFT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNF |