| FASTENER LENGTH | 0.410 INCHES NOMINAL |
| HEAD HEIGHT | 0.181 INCHES MINIMUM AND 0.194 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD 1ST MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 1022 OR STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| NONDEFINITIVE SPEC/STD DATA | II TYPE AND 10P STYLE |
| PRIMARY WASHER MATERIAL THICKNESS | 0.027 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.478 INCHES NOMINAL |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.350 INCHES MINIMUM |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 20 |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |