| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.6250 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.899 INCHES MINIMUM |
| FASTENER LENGTH | 1.669 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS6382 NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR |
| AMS6415 OR AMS6484 NATIONAL STD/SPEC 2ND MATERIAL RESPONSE OR |
| AMS6322,AMS6325 OR AMS6327 NATIONAL STD/SPEC 3RD MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC 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 | 0.618 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.6875 INCHES NOMINAL |
| EXTENDED WASHER DIAMETER | 1.040 INCHES MINIMUM AND |
| 1.050 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.150 INCHES NOMINAL |
| GRIP LENGTH | 0.740 INCHES MINIMUM AND |
| 0.760 INCHES MAXIMUM |
| GRIP DIAMETER | 0.6230 INCHES MINIMUM AND |
| 0.6240 INCHES MAXIMUM |
| SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| 32.0 MICROINCHES GRIP |
| 125.0 MICROINCHES THREADS |
| 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 DEG F |