RM77N - M18 Industrial Spark Plug
- Sales part numbers: 519, 640, 641
- Material: center electrode - copper-cored nickel
- Suppressor/Shielding: Sac-9
- Ground electrode: 4-GE, nickel
- Shell thread: 18 mm
- Terminal thread nut: threaded with knurl
- Reach (inch): 0.531
- Hex (inch): 0.875
- Available gap (inch): 0.0180 - 0.0220
- Reach (mm): 13.49
- Hex (mm): 22.23
- Available gap (mm): 0.4572 - 0.5588
- Core nose length (inch): 0.242
- Electrode max. operating temperature (F): 1700 F
- Overall length: 3.4 in.
Applications
- Gasoline (petrol)
- Natural gas (cng/lpg)