| BODY STYLE | ELECTRICALLY SHIELDED, PARTIAL INSULATOR, GASKET SEAT |
| USAGE DESIGN | AIRCRAFT ENGINE |
| ELECTRODE STYLE | FOUR GAP GROUND ELECTRODE |
| THREAD SIZE AND SERIES/TYPE DESIGNATOR | 3/4-20 UNEF SHIELD |
| REACH LENGTH | 0.812 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.875 INCHES NOMINAL |
| SEAT MAJOR DIAMETER | 0.970 INCHES NOMINAL |
| HEIGHT ABOVE MOUNTING SURFACE | 2.500 INCHES NOMINAL |
| TOP TO TERMINAL CONTACT DISTANCE | 1.500 INCHES NOMINAL |
| TOP TO SHIELD THREAD DISTANCE | 0.125 INCHES NOMINAL |
| SHIELD THREAD LENGTH | 0.375 INCHES NOMINAL |
| BARREL INSIDE DIAMETER | 0.380 INCHES NOMINAL |
| TERMINAL SLEEVE INSIDE DIAMETER | 0.290 INCHES NOMINAL |
| MEAN EFFECTIVE PRESSURE RATING | 300.0 POUNDS PER SQUARE INCH NOMINAL |
| DC RESISTANCE RATING IN OHMS | 500.0 MINIMUM AND |
| 1500.0 MAXIMUM |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 0AFL4 |
| DESIGN CONTROL REFERENCE | RHB37ND |