| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE,8620 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| STYLE DESIGNATOR | PIN TYPE, COUNTERBORE |
| CONCENTRIC HOLE DEPTH | 3.120 INCHES NOMINAL |
| CONCENTRIC HOLE DIAMETER | 0.250 INCHES NOMINAL |
| PIN DIAMETER | 1.250 INCHES NOMINAL |
| PIN OVERALL LENGTH | 5.812 INCHES NOMINAL |
| FIRST LOCKING GROOVE WIDTH | 0.430 INCHES NOMINAL |
| FIRST LOCKING GROOVE DEPTH | 0.170 INCHES NOMINAL |
| SECOND LOCKING GROOVE WIDTH | 0.430 INCHES NOMINAL |
| SECOND LOCKING GROOVE DEPTH | 0.170 INCHES NOMINAL |
| FIRST GREASE RELIEF GROOVE LENGTH | 0.515 INCHES NOMINAL |
| FIRST GREASE RELIEF GROOVE DEPTH | 0.035 INCHES NOMINAL |
| DISTANCE FROM END TO FIRST GREASE RELIEF GROOVE | 2.585 INCHES NOMINAL |
| MATERIAL HARDNESS RATING | 56.0 ROCKWELL C MINIMUM AND |
| 60.0 ROCKWELL C MAXIMUM |
| SPECIAL FEATURES | THREAD SERIES DESIGNATOR UNF |