NGK 1656 CMR7H-10 Standard Spark Plug 10mm Nickel Resistor

The NGK 1656 Standard Spark Plug (NGK CMR7H-10) is a nickel-electrode, copper-core resistor spark plug. It gives dependable ignition and OE-quality performance. NGK is a leading OE supplier of spark plugs, and it makes plugs for automotive, motorcycle, marine and small engine applications. This 10mm plug is a standard replacement for ignition systems that call for the CMR7H-10.

Key Features:

• Nickel alloy center and ground electrodes for long life and consistent performance
• Solid copper core for heat dissipation and conductivity
• Pure alumina silicate ceramic insulator for strength and better heat transfer
• Corrugated insulator ribs help prevent spark flashover
• Triple-seal construction helps prevent gas leakage past the shell
• Trivalent metal plating resists corrosion and seizing
• Built-in 10k ohm resistor suppresses radio frequency interference

Specifications:

• Thread size: M10 x 1.0 mm
• Reach: 12.7 mm (1/2")
• Hex size: 5/8" (16 mm)
• Heat range: 7
• Gap: 0.039" (1.0 mm)
• Seat type: Gasket (crush washer)
• Terminal: Solid, non-removable
• Center electrode: Nickel, 2.5 mm, non-projected
• Resistance: 10k ohm
• Torque: 7.2-10.8 lb-ft in cast iron heads; 7.2-8.7 lb-ft in aluminum heads

This spark plug is also known as NGK stock number 1656 and cross-references to NGK CMR7H-10. It suits a range of small engine and power equipment applications.