| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.060 INCHES NOMINAL |
| FASTENER LENGTH | 2.280 INCHES NOMINAL |
| HARDNESS RATING | 29.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.810 INCHES NOMINAL |
| HEAD HEIGHT | 0.234 INCHES NOMINAL |
| HEAD STYLE | FLAT CHAMFER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OVERALL |
| MINIMUM TENSILE STRENGTH | 130000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| RIB LENGTH | 0.750 INCHES NOMINAL |
| RIB MAJOR DIAMETER | 0.614 INCHES MINIMUM AND 0.619 INCHES MAXIMUM |
| SHOULDER DIAMETER | 0.593 INCHES MINIMUM AND 0.598 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 2.500 INCHES NOMINAL FIRST SHOULDER |
| SHOULDER SHAPE | RIBBED FIRST SHOULDER |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.946 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNF |