| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.608 INCHES NOMINAL |
| FASTENER LENGTH | 2.209 INCHES MINIMUM AND |
| 2.250 INCHES MAXIMUM |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-B-6812 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY II,CL 3 AND IAW MIL-B-6812 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HEAD STYLE | HEXAGON |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| HEAD HEIGHT | 0.265 INCHES MINIMUM AND |
| 0.297 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.740 INCHES MINIMUM AND |
| 0.752 INCHES MAXIMUM |
| GRIP LENGTH | 1.422 INCHES MINIMUM AND |
| 1.454 INCHES MAXIMUM |
| GRIP DIAMETER | 0.4986 INCHES MINIMUM AND |
| 0.4991 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 88044-AN173 THRU AN186 GOVERNMENT STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT-MACHINE,CLOSE TOLERANCE,AIRCRAFT |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 88044 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | AN178C21A |