| FASTENER LENGTH | 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| HEAD STYLE | HEADLESS (SETSCREW)HEADLESS (SETSCREW) |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1CROSS RECESS TYPE 1 |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALLQQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL |
| NOMINAL THREAD DIAMETER | 0.138 INCHES0.138 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 2 TYPE AND 3 STYLE |
| POINT STYLE | OVALOVAL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.250 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 3232 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC) |