| FASTENER LENGTH | 0.469 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD HEIGHT | 0.067 INCHES MINIMUM AND 0.080 INCHES MAXIMUM |
| HEAD STYLE | DISHED HEXAGON |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD 1ST MATERIAL RESPONSE FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD 2ND MATERIAL RESPONSE PRIMARY WASHER |
| MATERIAL | STEEL COMP 1050 OR STEEL COMP 1566 PRIMARY WASHER |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.016 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.270 INCHES MINIMUM AND 0.280 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| SURFACE TREATMENT | CADMIUM OR ZINC PRIMARY WASHER |
| SURFACE TREATMENT | CADMIUM OR ZINC FASTENER |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.419 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 40 |
| THREAD SERIES DESIGNATOR | UNF |
| WASHER QUANTITY | 1 |
| WIDTH BETWEEN FLATS | 0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |