| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.562 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.125 INCHES NOMINAL |
| FASTENER LENGTH | 2.062 INCHES NOMINAL |
| MATERIAL | STEEL COMP 1045 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633,SC-4 TYPE IV ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND |
| 32.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.875 INCHES NOMINAL |
| HEAD HEIGHT | 0.250 INCHES NOMINAL |
| SHOULDER SHAPE | RIBBED FIRST SHOULDER |
| SHOULDER DIAMETER | 0.562 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.781 INCHES NOMINAL FIRST SHOULDER |
| RIB LENGTH | 0.719 INCHES NOMINAL |
| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.062 INCHES NOMINAL |
| RIB INCLUDED ANGLE | 90.0 DEGREES NOMINAL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | STUD HUB STUD AND CUP RUNNING GEAR |