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 ZFR5E-11 Spark Plug Stock # 4435

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NGK ZFR5E-11 Spark Plug Stock # 4435NGK ZFR5E-11 is listed in the supplied catalog as spark plugs: Spark Plug Stock # 4435.Product Details Brand: NGK Manufacturer Part Number: ZFR5E-11 Product T...
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NGK ZFR6F-11G Spark Plug Stock # 6987

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NGK ZFR6F-11G Spark Plug Stock # 6987NGK ZFR6F-11G is listed in the supplied catalog as spark plugs: Spark Plug Stock # 6987.Product Details Brand: NGK Manufacturer Part Number: ZFR6F-11G Produc...
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NGK ZFR5N Spark Plug Stock # 3459

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NGK ZFR5N Spark Plug Stock # 3459NGK ZFR5N is listed in the supplied catalog as spark plugs: Spark Plug Stock # 3459.Product Details Brand: NGK Manufacturer Part Number: ZFR5N Product Type: Spar...
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NGK ZFR5LP-13G Spark Plug Stock # 7781

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NGK ZFR5LP-13G Spark Plug Stock # 7781NGK ZFR5LP-13G is listed in the supplied catalog as spark plugs: Spark Plug Stock # 7781.Product Details Brand: NGK Manufacturer Part Number: ZFR5LP-13G Pro...
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NGK ZFR4F-11 Spark Plug Stock # 4043

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NGK ZFR4F-11 Spark Plug Stock # 4043NGK ZFR4F-11 is listed in the supplied catalog as spark plugs: Spark Plug Stock # 4043.Product Details Brand: NGK Manufacturer Part Number: ZFR4F-11 Product T...
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NGK XR5 V-power Plugs 3332

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NGK XR5 V-power Plugs 3332NGK XR5 is listed in the supplied catalog as spark plugs: V-power Plugs 3332.Product Details Brand: NGK Manufacturer Part Number: XR5 Product Type: Spark Plugs Manufact...
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NGK UR55 V-power Plugs 2248

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NGK UR55 V-power Plugs 2248NGK UR55 is listed in the supplied catalog as spark plugs: V-power Plugs 2248.Product Details Brand: NGK Manufacturer Part Number: UR55 Product Type: Spark Plugs Manuf...
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NGK U5029 COP Ignition Coil Stock # 48998

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NGK U5029 COP Ignition Coil Stock # 48998NGK U5029 is listed in the supplied catalog as ignition coils: COP Ignition Coil Stock # 48998.Product Details Brand: NGK Manufacturer Part Number: U5029 ...
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NGK TR55GP Spark Plug # 3403

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NGK TR55GP Spark Plug # 3403NGK TR55GP is listed in the supplied catalog as spark plugs: Spark Plug # 3403.Product Details Brand: NGK Manufacturer Part Number: TR55GP Product Type: Spark Plugs M...
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NGK R7448A-9 Racing Spark Plug Stock #96969

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NGK R7448A-9 Racing Spark Plug Stock #96969NGK R7448A-9 is listed in the supplied catalog as spark plugs: Racing Spark Plug Stock #96969.Product Details Brand: NGK Manufacturer Part Number: R7448...
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NGK R6061-10 Racing Plug # 5962

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NGK R6061-10 Racing Plug # 5962NGK R6061-10 is listed in the supplied catalog as spark plugs: Racing Plug # 5962.Product Details Brand: NGK Manufacturer Part Number: R6061-10 Product Type: Spark...
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NGK R5674-10 V-power Racing Plug 6702

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NGK R5674-10 V-power Racing Plug 6702NGK R5674-10 is listed in the supplied catalog as spark plugs: V-power Racing Plug 6702.Product Details Brand: NGK Manufacturer Part Number: R5674-10 Product...
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NGK LZTR5A-13 Spark Plug Stock 4306

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NGK LZTR5A-13 Spark Plug Stock 4306NGK LZTR5A-13 is listed in the supplied catalog as spark plugs: Spark Plug Stock 4306.Product Details Brand: NGK Manufacturer Part Number: LZTR5A-13 Product Ty...
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NGK LFR5A-11 Spark Plug Stock # 6376

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NGK LFR5A-11 Spark Plug Stock # 6376NGK LFR5A-11 is listed in the supplied catalog as spark plugs: Spark Plug Stock # 6376.Product Details Brand: NGK Manufacturer Part Number: LFR5A-11 Product T...
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NGK ILFR6A Spark Plug Stock # 3588

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NGK ILFR6A Spark Plug Stock # 3588NGK ILFR6A is listed in the supplied catalog as spark plugs: Spark Plug Stock # 3588.Product Details Brand: NGK Manufacturer Part Number: ILFR6A Product Type: S...
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NGK DPR8Z Spark Plug Stock # 4730

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NGK DPR8Z Spark Plug Stock # 4730NGK DPR8Z is listed in the supplied catalog as spark plugs: Spark Plug Stock # 4730.Product Details Brand: NGK Manufacturer Part Number: DPR8Z Product Type: Spar...