| THREAD SERIES DESIGNATOR | UNRF |
| NOMINAL THREAD DIAMETER | 0.164 INCHES |
| THREAD QUANTITY PER INCH | 36 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.289 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| FASTENER LENGTH | 0.345 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| HARDNESS RATING | 33.0 ROCKWELL C MINIMUM AND |
| 42.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.262 INCHES MINIMUM AND |
| 0.270 INCHES MAXIMUM |
| HEAD HEIGHT | 0.159 INCHES MINIMUM AND |
| 0.164 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.141 INCHES MINIMUM AND |
| 0.143 INCHES MAXIMUM |
| HOLE CONFIGURATION STYLE | ROUND INTERNAL HEXAGON |
| HOLE TYPE | DRILLED |
| HOLE QUANTITY | 6 |
| HOLE DIAMETER | 0.044 INCHES MINIMUM AND |
| 0.050 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 80205-NAS51351 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT B056 |