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 U5065 COP Ignition Coil Stock # 48991

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NGK U5065 COP Ignition Coil Stock # 48991NGK U5065 is listed in the supplied catalog as ignition coils: COP Ignition Coil Stock # 48991.Product Details Brand: NGK Manufacturer Part Number: U5065 ...
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NGK TR7IX Spark Plug Stock # 3690

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NGK TR7IX Spark Plug Stock # 3690NGK TR7IX is listed in the supplied catalog as spark plugs: Spark Plug Stock # 3690.Product Details Brand: NGK Manufacturer Part Number: TR7IX Product Type: Spar...
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NGK R7437-8 Spark Plug Stock #4901

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NGK R7437-8 Spark Plug Stock #4901NGK R7437-8 is listed in the supplied catalog as spark plugs: Spark Plug Stock #4901.Product Details Brand: NGK Manufacturer Part Number: R7437-8 Product Type: ...
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NGK R6601-11 Spark Plug Stock #4586

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NGK R6601-11 Spark Plug Stock #4586NGK R6601-11 is listed in the supplied catalog as spark plugs: Spark Plug Stock #4586.Product Details Brand: NGK Manufacturer Part Number: R6601-11 Product Typ...
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NGK R5671A-7 V-power Racing Plug 4091 .750in Reach- Std Tip

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NGK R5671A-7 V-power Racing Plug 4091 .750in Reach- Std TipNGK R5671A-7 is listed in the supplied catalog as spark plugs: V-power Racing Plug 4091 .750in Reach- Std Tip.Product Details Brand: NGK ...
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NGK LTR6BHX Spark Plug Stock # 90495

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NGK LTR6BHX Spark Plug Stock # 90495NGK LTR6BHX is listed in the supplied catalog as spark plugs: Spark Plug Stock # 90495.Product Details Brand: NGK Manufacturer Part Number: LTR6BHX Product Ty...
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NGK LFR6BHX Spark Plug Stock # 93420

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NGK LFR6BHX Spark Plug Stock # 93420NGK LFR6BHX is listed in the supplied catalog as spark plugs: Spark Plug Stock # 93420.Product Details Brand: NGK Manufacturer Part Number: LFR6BHX Product Ty...
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NGK LFR5AIX-11 Spark Plug Stock # 4469

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NGK LFR5AIX-11 Spark Plug Stock # 4469NGK LFR5AIX-11 is listed in the supplied catalog as spark plugs: Spark Plug Stock # 4469.Product Details Brand: NGK Manufacturer Part Number: LFR5AIX-11 Pro...
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NGK JR9C Spark Plug 6193

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NGK JR9C Spark Plug 6193NGK JR9C is listed in the supplied catalog as spark plugs: Spark Plug 6193.Product Details Brand: NGK Manufacturer Part Number: JR9C Product Type: Spark Plugs Manufacture...
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NGK ILFR6G-E Spark Plug Stock # 4212

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NGK ILFR6G-E Spark Plug Stock # 4212NGK ILFR6G-E is listed in the supplied catalog as spark plugs: Spark Plug Stock # 4212.Product Details Brand: NGK Manufacturer Part Number: ILFR6G-E Product T...
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NGK DR7EA Spark Plug Stock # 7839

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NGK DR7EA Spark Plug Stock # 7839NGK DR7EA is listed in the supplied catalog as spark plugs: Spark Plug Stock # 7839.Product Details Brand: NGK Manufacturer Part Number: DR7EA Product Type: Spar...
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NGK D9EA Spark Plug Stock # 2420 (motorcycle)

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NGK D9EA Spark Plug Stock # 2420 (motorcycle)NGK D9EA is listed in the supplied catalog as spark plugs: Spark Plug Stock # 2420 (motorcycle).Product Details Brand: NGK Manufacturer Part Number: D...
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NGK CR6HSA Spark Plug Stock 2983

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NGK CR6HSA Spark Plug Stock 2983NGK CR6HSA is listed in the supplied catalog as spark plugs: Spark Plug Stock 2983.Product Details Brand: NGK Manufacturer Part Number: CR6HSA Product Type: Spark...
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NGK CMR6A Spark Plug Stock # 1223

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NGK CMR6A Spark Plug Stock # 1223NGK CMR6A is listed in the supplied catalog as spark plugs: Spark Plug Stock # 1223.Product Details Brand: NGK Manufacturer Part Number: CMR6A Product Type: Spar...
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NGK BR9ECMIX Spark Plug Stock # 2707

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NGK BR9ECMIX Spark Plug Stock # 2707NGK BR9ECMIX is listed in the supplied catalog as spark plugs: Spark Plug Stock # 2707.Product Details Brand: NGK Manufacturer Part Number: BR9ECMIX Product T...
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NGK BR7EFS Spark Plug Stock # 1094

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NGK BR7EFS Spark Plug Stock # 1094NGK BR7EFS is listed in the supplied catalog as spark plugs: Spark Plug Stock # 1094.Product Details Brand: NGK Manufacturer Part Number: BR7EFS Product Type: S...