| BEARING SURFACE OF HEAD SURFACE FINISH | 63.0 MICROINCHES |
| FASTENER LENGTH | 0.4840 INCHES MINIMUM AND 0.5310 INCHES MAXIMUM |
| HEAD HEIGHT | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SCREW MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE |
| SCREW MATERIAL | IRON ALLOY 660 |
| SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| SCREW SURFACE TREATMENT | PASSIVATE |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.423 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |
| THREAD SURFACE FINISH | 32.0 MICROINCHES |
| WIDTH BETWEEN FLATS | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM |