| DISTANCE FROM CENTER OF HEAD TO CENTER OF SHANK | 0.124 INCHES NOMINAL |
| DISTANCE FROM CENTERLINE TO FLAT | 0.123 INCHES MINIMUM AND 0.124 INCHES MAXIMUM |
| FASTENER LENGTH | 0.625 INCHES MINIMUM AND 0.645 INCHES MAXIMUM |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.480 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| HEAD HEIGHT | 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SHANK UNTHREADED HOLE DIAMETER | 0.065 INCHES MINIMUM AND 0.072 INCHES MAXIMUM FIRST HOLE |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 28 |