| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.375 INCHES MINIMUM |
| FASTENER LENGTH | 0.375 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4037 OR |
| STEEL COMP 4137 OR |
| STEEL COMP 4140 OR |
| STEEL COMP 8630 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND |
| 49.0 ROCKWELL C MAXIMUM OVERALL |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.125 INCHES NOMINAL |
| POINT STYLE | HALF DOG |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND |
| 6 STYLE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FFS200 |