NGK 6221 BM6F Standard Nickel Spark Plug, Copper Core, 14mm

The NGK 6221 (BM6F) Standard Spark Plug is a copper-core, nickel-alloy spark plug built to OE-style specifications. It is a non-resistor plug with a heat range of 6 and a compact 14mm thread. It suits many small engine, lawn and garden, and other non-automotive uses, as well as applications that call for the BM6F plug number.

Key Features:

• Solid copper core: improves heat dissipation and conductivity and gives a wide heat range.
• Nickel alloy electrodes: nickel center and ground electrodes give consistent, reliable performance.
• Alumina silicate ceramic insulator: gives strength, good dielectric performance and better heat transfer.
• Triple gasket sealing: helps prevent combustion gas leakage past the shell.
• Cold-rolled threads: help prevent cross-threading and cylinder head damage.
• Trivalent metal plating: resists corrosion and seizing, so the plug installs and removes more easily.
• Corrugated insulator ribs: help prevent flashover.

Specifications:

• NGK stock number: 6221
• NGK plug number: BM6F
• Heat range: 6
• Thread size: M14 x 1.25 (14mm diameter, 1.25mm pitch)
• Thread reach: 3/8 in (9.5mm)
• Hex size: 5/8 in (16mm)
• Seat type: Tapered
• Pre-set gap: 0.028 in (0.7mm)
• Terminal type: Removable nut
• Resistor: No
• Center electrode: Nickel, copper core, non-projected
• Ground electrode: Nickel, standard design
• Torque: 10.8-18 lb-ft in cast iron heads, 7.2-14.5 lb-ft in aluminum heads
• Country of origin: Japan

NGK is a leading original equipment spark plug supplier. It makes spark plugs for automotive, motorcycle, marine and small engine applications. The NGK 6221 is best for engines that use OE nickel alloy plugs. It is not recommended where the factory plug is precious metal.