| COUNTERBORE DIAMETER | 0.255 INCHES MINIMUM AND 0.258 INCHES MAXIMUM NUT |
| HEAD HEIGHT | 0.040 INCHES NOMINAL |
| HEAD MAJOR DIAMETER | 0.436 INCHES MINIMUM AND 0.440 INCHES MAXIMUM |
| HEAD MINOR COUNTERSINK ANGLE | 59.45 DEGREES MINIMUM AND 60.15 DEGREES MAXIMUM |
| HEAD MINOR DIAMETER | 0.370 INCHES MINIMUM AND 0.374 INCHES MAXIMUM |
| HEAD MAJOR COUNTERSINK ANGLE | 75.45 DEGREES MINIMUM AND 76.15 DEGREES MAXIMUM |
| HEAD STYLE | ELIPTICAL COUNTERSUNK |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-763,CL 304 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-763,CL 305,COND A FED SPEC 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 304 OR STEEL COMP 305 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT GRIP RANGE | +0.460 TO 0.520 INCHES |
| NUT DIAMETER | 0.325 INCHES MINIMUM AND 0.327 INCHES MAXIMUM |
| NUT LENGTH | 1.347 INCHES MINIMUM AND 1.377 INCHES MAXIMUM |
| NUT STYLE | BLIND RIVET W/SMOOTH ROUND SHANK |
| SHANK END TYPE | CLOSED |
| TEMP RATING | 450.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNJF |
| THREAD QUANTITY PER INCH | 28 |