| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| WIDTH BETWEEN FLATS | 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL-1222J GOVERNMENT SPECIFICATION |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 2A |
| FASTENER LENGTH | 2.25 INCHES NOMINAL |
| HARDNESS RATING | 24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM FASTENER |
| HEAD HEIGHT | 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| LOCKING FEATURE | SELF-LOCKING LOCKING FEATURE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | HEX CAP SCREW |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM F468/QQ-N-286 SOLUTION ANNEALED AND AGED AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE FASTENER |
| MATERIAL | NICKEL ALLOY 500 FASTENER |
| MINIMUM TENSILE STRENGTH | 130000 POUNDS PER SQUARE INCH |
| MINIMUM YIELD STRENGTH | 90000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| SPECIAL FEATURES | SELF-LOCKING ELEMENTS PER MIL-F-8961 OR MIL-DTL-18240 |
| THREAD QUANTITY PER INCH | 16 |
| THREAD LENGTH | 1.00 INCHES NOMINAL |