| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.4375 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.694 INCHES NOMINAL |
| FASTENER LENGTH | 3.554 INCHES MINIMUM AND |
| 3.584 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6382 ASSN STD 1ST MATERIAL RESPONSE OR |
| AMS 6415 ASSN STD 2ND MATERIAL RESPONSE OR |
| AMS 6322 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS672 NATIONAL STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.425 INCHES MINIMUM AND |
| 0.445 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.494 INCHES MINIMUM AND |
| 0.503 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.740 INCHES MINIMUM AND |
| 0.750 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.089 INCHES MINIMUM AND |
| 0.109 INCHES MAXIMUM |
| HOLE CONFIGURATION STYLE | DOUBLE HEXAGON FLATS |
| HOLE TYPE | DRILLED |
| HOLE QUANTITY | 4 |
| HOLE DIAMETER | 0.050 INCHES MINIMUM AND |
| 0.060 INCHES MAXIMUM |
| GRIP LENGTH | 2.865 INCHES MINIMUM AND |
| 2.885 INCHES MAXIMUM |
| GRIP DIAMETER | 0.4360 INCHES MINIMUM AND |
| 0.4370 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 80205-NAS624 THRU NAS644 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT,TENSION,ALLOY STEEL,TWELVE POINT,EXTERNAL WRENCHING,180 KSI FTU |