| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.375 INCHES MAXIMUM |
| FASTENER LENGTH | 0.344 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1010 OR |
| STEEL COMP 1011 OR |
| STEEL COMP 1013 OR |
| STEEL COMP 1015 OR |
| STEEL COMP 1016 OR |
| STEEL COMP 1017 OR |
| STEEL COMP 1018 OR |
| STEEL COMP 1019 OR |
| STEEL COMP 1020 OR |
| STEEL COMP 1022 OR |
| STEEL COMP 1137 OR |
| STEEL COMP 1035 OR |
| STEEL COMP 1536 OR |
| STEEL COMP 1037 OR |
| STEEL COMP 1038 OR |
| STEEL COMP 1039 OR |
| STEEL COMP 1040 OR |
| STEEL COMP 1541 OR |
| STEEL COMP 1042 OR |
| STEEL COMP 1043 OR |
| STEEL COMP 1044 OR |
| STEEL COMP 1045 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TYPE 2 CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND |
| 37.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | SQUARE |
| HEAD HEIGHT | 0.178 INCHES MINIMUM AND |
| 0.196 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.241 INCHES MINIMUM AND |
| 0.250 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| POINT STYLE | CUP |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 96906 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS51955-1 |