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Champion M18 Industrial Spark Plug RM77N Champion M18 Industrial Spark Plug RM77N Sales part numbers: 519, 640, 641 Material: center electrode - copper-cored nickel SuppressorShielding: 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.
Federal-Mogul Corporation