NGK

NGK — The World's #1 Spark Plug Brand

NGK has been manufacturing spark plugs and ignition components since 1936, earning the position of the world's most widely used spark plug brand through consistent quality, precise application engineering, and a product lineup that covers virtually every gasoline and diesel engine on the road. From standard copper plugs to laser iridium performance units, NGK produces spark plugs for OEM factory fill, replacement service, and high-performance applications — with the same engineering rigor applied to every tier of the product lineup.

Copper Spark Plugs

NGK's copper core spark plugs are the baseline of the lineup, providing reliable ignition performance for standard replacement applications across a wide range of domestic and import engines. Copper core construction provides excellent thermal conductivity for consistent heat range performance, with NGK's corrugated ribs and triple gasket seal preventing flashover and ensuring a leak-free installation. Copper plugs are the correct choice for older engines with conventional ignition systems and for applications where plug replacement is performed at standard service intervals.

Platinum & Double Platinum Spark Plugs

NGK platinum spark plugs extend service life beyond copper plugs through a platinum firing tip that resists electrode wear at the higher temperatures generated by modern engine management systems. Double platinum designs place platinum on both the center and ground electrodes, providing consistent gap maintenance over extended service intervals on waste-spark ignition systems where both electrodes experience equal wear. Platinum plugs are the correct OEM-specification replacement for most modern domestic and import vehicles with extended tune-up intervals.

Iridium & Laser Iridium Spark Plugs

NGK's iridium spark plug lineup represents the highest tier of the product range, with iridium firing tips that provide the longest service life and most consistent spark performance of any plug construction. The fine-wire iridium center electrode requires less voltage to fire than a conventional electrode, reducing ignition system load and improving spark reliability at high RPM and under boost. Laser Iridium plugs use a laser-welded iridium tip on both the center and ground electrodes for maximum durability and consistent gap maintenance over 100,000-mile service intervals on supported applications.

For performance and forced induction applications, NGK's iridium plugs provide the spark reliability needed at elevated cylinder pressures where conventional plugs misfire. The reduced firing voltage requirement of the fine-wire iridium electrode is particularly beneficial in turbocharged and supercharged engines where cylinder pressure at ignition timing is significantly higher than a naturally aspirated equivalent.

Racing Spark Plugs

NGK produces a dedicated racing spark plug lineup for competition applications where standard plugs are insufficient for the heat range, electrode configuration, or firing voltage requirements of the engine. Racing plugs are available in a wide range of heat ranges to match the specific thermal load of different engine combinations, fuel types, and boost levels. Correct heat range selection is critical in race applications — a plug that is too cold will foul, while a plug that is too hot risks pre-ignition and engine damage.

Oxygen Sensors

NGK produces OEM-quality oxygen sensors and air/fuel ratio sensors for a wide range of domestic and import vehicles. Wideband and narrowband sensor options cover both pre-cat and post-cat sensor positions, with direct-fit connectors and correct thread pitch for each supported application. NGK oxygen sensors meet or exceed OEM specifications for response time, accuracy, and service life — ensuring correct fuel trim operation and emissions system function after replacement.

Common Applications

NGK spark plugs and sensors cover virtually every domestic and import vehicle platform — including GM, Ford, Chrysler/Mopar, Toyota, Honda, Subaru, Nissan, BMW, Mercedes-Benz, Volkswagen, and Audi applications across all engine types and model years. NGK's application database is the most comprehensive in the spark plug industry, with OEM-specification plugs for current-model-year vehicles and replacement plugs for vintage and classic applications.

Installation Notes

NGK spark plugs are pre-gapped to the OEM specification for most applications — verify the gap against the vehicle specification before installation and adjust carefully if needed, as iridium and platinum fine-wire electrodes are more fragile than copper electrodes and can be damaged by aggressive gapping. Apply anti-seize to plug threads only if specified by the vehicle manufacturer — NGK plugs have a nickel-plated shell that provides adequate corrosion resistance without anti-seize on m...

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  • NGK Spark Plug Stock # 6801 (snowmobile) BR10EIX
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    NGK Spark Plug Stock # 6801 (snowmobile) BR10EIX
    $10.99 USD
    $10.99 USD
    $10.99 USD
    NGK Spark Plug Stock # 6801 (snowmobile) BR10EIX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applic...
  • NGK COP Ignition Coil Stock # 48723 U5104
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    NGK COP Ignition Coil Stock # 48723 U5104
    $25.99 USD
    $25.99 USD
    $25.99 USD
    NGK COP Ignition Coil Stock # 48723 U5104 is a NGK ignition coils built to support strong spark output, reliable ignition performance, and clean engine operation. This listing is built for buyers w...
  • NGK COP Ignition Coil Stock # 48841 U5051
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    NGK COP Ignition Coil Stock # 48841 U5051
    $35.99 USD
    $35.99 USD
    $35.99 USD
    NGK COP Ignition Coil Stock # 48841 U5051 is a NGK ignition coils built to support strong spark output, reliable ignition performance, and clean engine operation. This listing is built for buyers w...
  • NGK Ignition Coil Stock # 49032 U1175
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    NGK Ignition Coil Stock # 49032 U1175
    $42.99 USD
    $42.99 USD
    $42.99 USD
    NGK Ignition Coil Stock # 49032 U1175 is a NGK ignition coils built to support strong spark output, reliable ignition performance, and clean engine operation. This listing is built for buyers who n...
  • NGK Ignition Coil Stock # 48633 U1085
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    NGK Ignition Coil Stock # 48633 U1085
    $36.99 USD
    $36.99 USD
    $36.99 USD
    NGK Ignition Coil Stock # 48633 U1085 is a NGK ignition coils built to support strong spark output, reliable ignition performance, and clean engine operation. This listing is built for buyers who n...
  • NGK V-power Racing Plug 7317 R5724-8
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    NGK V-power Racing Plug 7317 R5724-8
    $3.99 USD
    $3.99 USD
    $3.99 USD
    NGK V-power Racing Plug 7317 R5724-8 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK V-power Racing Plug 5657 R5674-8
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    NGK V-power Racing Plug 5657 R5674-8
    $6.69 USD
    $6.69 USD
    $6.69 USD
    NGK V-power Racing Plug 5657 R5674-8 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock # 5555 PFR6G-11
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    NGK Spark Plug Stock # 5555 PFR6G-11
    $13.99 USD
    $13.99 USD
    $13.99 USD
    NGK Spark Plug Stock # 5555 PFR6G-11 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug - Stock 3672 LFR6A-11
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    NGK Spark Plug - Stock 3672 LFR6A-11
    $7.59 USD
    $7.59 USD
    $7.59 USD
    NGK Spark Plug - Stock 3672 LFR6A-11 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock # 4462 IZFR6J
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    NGK Spark Plug Stock # 4462 IZFR6J
    $16.99 USD
    $16.99 USD
    $16.99 USD
    NGK Spark Plug Stock # 4462 IZFR6J is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This l...
  • NGK Spark Plug Stock # 7556 IMR9E-9HES
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    NGK Spark Plug Stock # 7556 IMR9E-9HES
    $17.99 USD
    $17.99 USD
    $17.99 USD
    NGK Spark Plug Stock # 7556 IMR9E-9HES is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. Th...
  • NGK Spark Plug Stock # 6507 IFR6B
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    NGK Spark Plug Stock # 6507 IFR6B
    $16.99 USD
    $16.99 USD
    $16.99 USD
    NGK Spark Plug Stock # 6507 IFR6B is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...
  • NGK Spark Plug Stock # 7866 IFR5N10
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    NGK Spark Plug Stock # 7866 IFR5N10
    $13.99 USD
    $13.99 USD
    $13.99 USD
    NGK Spark Plug Stock # 7866 IFR5N10 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This ...
  • NGK Spark Plug Stock # 5123 DR8HS
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    NGK Spark Plug Stock # 5123 DR8HS
    $3.49 USD
    $3.49 USD
    $3.49 USD
    NGK Spark Plug Stock # 5123 DR8HS is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...
  • NGK Spark Plug Stock # 3481 DCPR6E
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    NGK Spark Plug Stock # 3481 DCPR6E
    $5.19 USD
    $5.19 USD
    $5.19 USD
    NGK Spark Plug Stock # 3481 DCPR6E is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This l...
  • NGK Spark Plug Stock # 7599 CMR5H
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    NGK Spark Plug Stock # 7599 CMR5H
    $5.69 USD
    $5.69 USD
    $5.69 USD
    NGK Spark Plug Stock # 7599 CMR5H is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...

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