| DIAMETER OF RECESSED PORTION OF SHANK | 0.4025 INCHES MINIMUM AND 0.4035 INCHES MAXIMUM |
| HARDNESS RATING | 277.0 BRINELL STANDARD MINIMUM AND 331.0 BRINELL STANDARD MAXIMUM |
| LENGTH OF RECESSED PORTION OF SHANK | 0.628 INCHES MINIMUM AND 0.690 INCHES MAXIMUM |
| OVERALL LENGTH | 2.438 INCHES MINIMUM AND 2.500 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL COMP 4142 |
| NOMINAL THREAD SIZE | 0.438 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.438 INCHES STUD THREAD |
| STYLE DESIGNATOR | RECESSED |
| THREAD CLASS | 2A NUT THREAD |
| THREAD CLASS | 2A STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.810 INCHES NOMINAL STUD THREAD |
| THREAD LENGTH | 1.000 INCHES NOMINAL NUT THREAD |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| THREAD SERIES DESIGNATOR | UNF STUD THREAD |
| THREAD QUANTITY PER INCH | 20 NUT THREAD |
| THREAD QUANTITY PER INCH | 20 STUD THREAD |