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Champion Industrial Spark Plug RW78N Sales part numbers: 631 Material: center electrode - copper-cored nickel SuppressorShielding: Sac-9 Ground electrode: 4-GE, nickel Shell thread: 78"-18 Terminal thread nut: threaded with knurl Reach (inch): 0.861 Hex (inch): 1 Available gap (inch): 0.0100 - 0.0130 Reach (mm): 21.87 Hex (mm): 25.40 Available gap (mm): 0.254 - 0.3302 Core nose length (inch): 0.375 Electrode max. operating temperature (F): 1700 F Overall length: 4.43 in.
Federal-Mogul Corporation