| USAGE DESIGN | ENGINE OTHER THAN AIRCRAFT |
| REACH LENGTH | 0.625 INCHES NOMINAL |
| ELECTRODE STYLE | TWO FLAT GROUND ELECTRODE |
| THREAD SIZE AND SERIES/TYPE DESIGNATOR | 5/8-24 UNEF SHIELD |
| THREAD SIZE AND SERIES/TYPE DESIGNATOR | 7/8-18 UNS BASE |
| BODY STYLE | ELECTRICALLY SHIELDED, FULL INSULATOR, GASKET SEAT |
| MEAN EFFECTIVE PRESSURE RATING | 245.0 POUNDS PER SQUARE INCH NOMINAL |
| TOP TO TERMINAL CONTACT DISTANCE | 1.000 INCHES NOMINAL |
| TERMINAL SLEEVE INSIDE DIAMETER | 0.378 INCHES NOMINAL |
| SHIELD THREAD LENGTH | 0.500 INCHES NOMINAL |
| SEAT MAJOR DIAMETER | 1.125 INCHES MAXIMUM |
| HEIGHT ABOVE MOUNTING SURFACE | 2.625 INCHES NOMINAL |
| NONDEFINITIVE SPEC/STD DATA | 2 TYPE AND A CLASS |
| TOP TO SHIELD THREAD DISTANCE | 0.125 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.937 INCHES NOMINAL |