| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.3125 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.750 INCHES NOMINAL |
| FASTENER LENGTH | 0.750 INCHES NOMINAL |
| MATERIAL | NICKEL ALLOY 400 OR |
| NICKEL ALLOY K-500 FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM F468 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OR |
| QQ-N-281,CLASS A FED SPEC SINGLE MATERIAL RESPONSE FASTENER |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.550 INCHES MINIMUM AND |
| 0.562 INCHES MAXIMUM |
| HEAD HEIGHT | 0.368 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.312 INCHES NOMINAL |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN LOCKING FEATURE |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL-1222J GOVERNMENT SPECIFICATION |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SOCKET HEAD CAP SCREW |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81349 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | M1222SN5C312NCLN |