| FASTENER LENGTH | 4.050 INCHES NOMINAL |
| GRIP DIAMETER | 0.4335 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM |
| GRIP LENGTH | 3.200 INCHES NOMINAL |
| HARDNESS RATING | 255.0 BRINELL STANDARD MINIMUM AND 321.0 BRINELL STANDARD MAXIMUM |
| HEAD HEIGHT | 0.260 INCHES MINIMUM AND 0.270 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | BS S80 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL |
| MINIMUM TENSILE STRENGTH | 127680 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.438 INCHES |
| WIDTH BETWEEN FLATS | 0.679 INCHES MINIMUM AND 0.688 INCHES MAXIMUM |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.850 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNF |