| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | HEADLESS (SETSCREW) |
| HOLE CONFIGURATION STYLE | ROUND LONGITUDINAL HOLE |
| HOLE DIAMETER | 0.046 INCHES NOMINAL |
| HOLE QUANTITY | 1 |
| HOLE TYPE | DRILLED |
| INTERNAL DRIVE STYLE | SIX SPLINE |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 4032 OR STEEL COMP 4037 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 8630 OR STEEL COMP 8740 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 2 TYPE AND 4 STYLE |
| POINT STYLE | CUP |
| SPLINE MAJOR DIAMETER | 0.147 INCHES MINIMUM AND 0.149 INCHES MAXIMUM |
| SPLINE MINOR DIAMETER | 0.126 INCHES MINIMUM AND 0.128 INCHES MAXIMUM |
| SPLINE WIDTH | 0.030 INCHES MINIMUM AND 0.032 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.500 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |