| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.2500 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.492 INCHES MINIMUM |
| FASTENER LENGTH | 0.9295 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 OR |
| STEEL COMP 6150 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5826(AISI 4140) GOVERNMENT STD/SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-5000(AISI 4340) GOVERNMENT STD/SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-6049(AISI 8740) GOVERNMENT STD/SPEC 3RD MATERIAL RESPONSE OR |
| MIL-S-8503(AISI 6150) GOVERNMENT STD/SPEC 4TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE II,CLASS 2 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 EXTENDED WASHER |
| HEAD HEIGHT | 0.300 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.3125 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND |
| 0.438 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.069 INCHES NOMINAL |
| GRIP LENGTH | 0.4275 INCHES MINIMUM AND |
| 0.4475 INCHES MAXIMUM |
| GRIP DIAMETER | 0.2485 INCHES MINIMUM AND |
| 0.2495 INCHES MAXIMUM |
| SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| 125.0 MICROINCHES GRIP |
| 125.0 MICROINCHES THREADS |
| SPECIAL FEATURES | MAXIMUM TENSILE STRENGTH IS 200,000 PSI |
| SPECIFICATION/STANDARD DATA | 80205-NASM21250 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT,TENSION,STEEL,EXTERNAL WRENCHING,FLANGED,12-POINT,180 KSI FTU,450 DEGREE |