| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.425 INCHES NOMINAL |
| FASTENER LENGTH | 1.535 INCHES MINIMUM AND |
| 1.565 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS6349 OR AMS6382 ASSN STD 1ST MATERIAL RESPONSE OR |
| AMS6415 OR AMS6484 ASSN STD 2ND MATERIAL RESPONSE OR |
| AMS6322,6325 OR AMS6327 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS-QQ-P-416,TY II,CL 2;EMBRITTLEMENT PER NAS4002 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.125 INCHES MINIMUM AND |
| 0.140 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.429 INCHES MINIMUM AND |
| 0.439 INCHES MAXIMUM |
| GRIP LENGTH | 1.115 INCHES MINIMUM AND |
| 1.135 INCHES MAXIMUM |
| GRIP DIAMETER | 0.2641 INCHES MINIMUM AND |
| 0.2651 INCHES MAXIMUM |
| SURFACE FINISH | 32.0 MICROINCHES OVERALL |
| 125.0 MICROINCHES ALL HOLES |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.372 INCHES NOMINAL THREADS |
| SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND |
| 0.086 INCHES MAXIMUM THREADS |
| SPECIFICATION/STANDARD DATA | 80205-NAS6603 THRU NAS6620 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT,TENSION,HEX HEAD,CLOSE TOLERANCE,ALLOY STEEL,LONG THREAD,REDUCED MAJOR DIA.,SELF-LOCKING AND NONLOCKING,160 KSI FTU |