| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.440 INCHES NOMINAL |
| FASTENER LENGTH | 1.760 INCHES MINIMUM AND 1.790 INCHES MAXIMUM |
| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 77.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 80.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL |
| HEAD DIAMETER | 0.780 INCHES MINIMUM AND 0.810 INCHES MAXIMUM |
| HEAD HEIGHT | 0.260 INCHES NOMINAL |
| HEAD STYLE | FLAT CHAMFER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE J429 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.437 INCHES |
| RIB MINOR DIAMETER | 0.540 INCHES MINIMUM AND 0.543 INCHES MAXIMUM |
| RIB QUANTITY | 35 |
| RIB INCLUDED ANGLE | 85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM |
| RIB LENGTH | 0.240 INCHES NOMINAL |
| RIB MAJOR DIAMETER | 0.556 INCHES MINIMUM AND 0.566 INCHES MAXIMUM |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.775 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNF |