| MATERIAL AND LOCATION | STEEL, FED STD 66, AISI/SAE 3140 OVERALL |
| METALLIC HARDNESS RATING AND LOCATION | 30.0 ROCKWELL C MINIMUM STEM |
| 40.0 ROCKWELL C MAXIMUM STEM |
| 49.0 ROCKWELL C NOMINAL TIP |
| HEAD STYLE | MUSHROOM |
| HEAD HEIGHT | 0.1760 INCHES MINIMUM AND |
| 0.2060 INCHES MAXIMUM |
| OUTSIDE DIAMETER | 1.5060 INCHES MINIMUM AND |
| 1.5160 INCHES MAXIMUM |
| NECK RADIUS | 1.3750 INCHES NOMINAL |
| SEAT ANGLE IN DEG | 45.0 |
| STEM STYLE | DOUBLE GROOVED |
| CHAMFER LENGTH | 0.0156 INCHES NOMINAL |
| STEM LENGTH | 5.6700 INCHES MINIMUM AND |
| 5.6800 INCHES MAXIMUM |
| STEM DIAMETER | 0.3095 INCHES MINIMUM AND |
| 0.3100 INCHES MAXIMUM |
| DISTANCE FROM FIRST GROOVE TO STEM END | 0.2970 INCHES MINIMUM AND |
| 0.3170 INCHES MAXIMUM |
| DISTANCE FROM SECOND GROOVE TO STEM END | 0.9531 INCHES NOMINAL |
| FIRST GROOVE DIAMETER | 0.2670 INCHES MINIMUM AND |
| 0.2730 INCHES MAXIMUM |
| SECOND GROOVE DIAMETER | 0.2920 INCHES MINIMUM AND |
| 0.2980 INCHES MAXIMUM |
| FIRST GROOVE WIDTH | 0.0950 INCHES MINIMUM AND |
| 0.1050 INCHES MAXIMUM |
| SECOND GROOVE WIDTH | 0.0180 INCHES NOMINAL |
| CHAMFER ANGLE IN DEG | 45.0 |
| CARBON RELIEF GROOVE | NOT INCLUDED |
| FSC APPLICATION DATA | DIESEL ENGINE |