NGK's Standard Plugs are Constructed for Longer Life and Optimum Performance. Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties. Corrugated Ribs Prevent Flashover. Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer. Copper Core Aids in Heat Removal. Triple Seals Prevent Leakage. Plug Specifications: Thread Size: 14mm. Hex Size: 20.6mm (BCPR6ES-11 is 16mm). Reach: 19mm. Seat Type: Gasket. Gap: 0.8mm (BCPR6ES-11 is 1.1mm). Terminal Type: Removable Nut (BCPR6ES-11 is Solid). Thread Pitch: 1.25mm.
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