| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.855 INCHES MINIMUM AND |
| 0.895 INCHES MAXIMUM |
| FASTENER LENGTH | 0.855 INCHES MINIMUM AND |
| 0.895 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 301 OR |
| STEEL COMP 302 OR |
| STEEL COMP 302B OR |
| STEEL COMP 303 OR |
| STEEL COMP 303SE OR |
| STEEL COMP 304 OR |
| STEEL COMP 304L OR |
| STEEL COMP 305 OR |
| STEEL COMP 308 OR |
| STEEL COMP 309 OR |
| STEEL COMP 309S OR |
| STEEL COMP 310 OR |
| STEEL COMP 310S OR |
| STEEL COMP 314 OR |
| STEEL COMP 316 OR |
| STEEL COMP 316L OR |
| STEEL COMP 317 OR |
| STEEL COMP 321 OR |
| STEEL COMP 347 OR |
| STEEL COMP 348 OR |
| STEEL COMP 384 OR |
| STEEL COMP 385 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | HEADLESS (SETSCREW) |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.156 INCHES NOMINAL |
| LOCKING FEATURE | PATCH OR |
| PELLET OR |
| STRIP THREADS |
| POINT STYLE | FLAT |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND |
| 1 STYLE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FF-S-200 |