| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.086 INCHES |
| THREAD QUANTITY PER INCH | 56 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.166 INCHES MAXIMUM |
| FASTENER LENGTH | 0.313 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 FEDERAL STANDARD FED STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OR |
| CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TY 1, CL 3 FED SPEC 1ST TREATMENT RESPONSE OR |
| QQ-Z-325, TY 1, CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND |
| 53.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | HEADLESS (SETSCREW) |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.035 INCHES MINIMUM AND |
| 0.036 INCHES MAXIMUM |
| POINT STYLE | CONE |
| POINT CHAMFER ANGLE | 90.0 DEGREES NOMINAL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, SET, SOCKET, CONE POINT CLASS 3A |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 21450 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | 588611 |