| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| FASTENER LENGTH | 1.125 INCHES MINIMUM AND |
| 1.187 INCHES MAXIMUM |
| MATERIAL | STEEL COMP E4340 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR |
| AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| HEAD STYLE | CROWNED HEXAGON |
| HEAD HEIGHT | 0.172 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.490 INCHES MINIMUM AND |
| 0.502 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| POINT STYLE | FLAT |
| SPECIAL FEATURES | SLOT 0.061 IN. MIN,0.077 IN. MAX WIDE,0.097 IN. MIN,0.130 IN. MAX LONG,END OF SHANK. HOLE IN SHANK 0.907 IN. MIN,0.969 IN. MAX FROM HEAD BEARING SURFACE. 0.076 IN. MIN,0.081 IN. MAX DIA |