| DISTANCE FROM CENTERLINE TO FLAT | 0.165 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM |
| FASTENER LENGTH | 1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.620 INCHES MINIMUM AND 0.640 INCHES MAXIMUM |
| HEAD HEIGHT | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5616 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| RIB LENGTH | 0.150 INCHES MINIMUM AND 0.190 INCHES MAXIMUM |
| RIB MAJOR DIAMETER | 0.317 INCHES NOMINAL |
| RIB MINOR DIAMETER | 0.289 INCHES NOMINAL |
| RIB QUANTITY | 36 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.488 INCHES MINIMUM AND 0.548 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 28 |