Spark Plugs - 18mm Spark Plug Thread Size - No Resistor - Free Shipping on Orders Over $109 at Summit Racing

NGK Standard Series Spark Plugs AP8FS

Spark Plug, Standard Series, Tapered Seat, 18mm Thread, .460 in. Reach, Projected Tip, Non-Resistor, Each

Part Number: NGK-2227

5.0 out of 5 stars ( 2 )

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Autolite Racing Spark Plugs R33

Spark Plug, Racing, Copper Core, Tapered Seat, 18mm Thread, 0.438 in. Reach, Each

Part Number: ATL-AR33

5.0 out of 5 stars ( 1 )

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Autolite Racing Spark Plugs R32

Spark Plug, Racing, Copper Core, Tapered Seat, 18mm Thread, 0.433 in. Reach, Each

Part Number: ATL-AR32

5.0 out of 5 stars ( 1 )

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NGK Standard Series Spark Plugs AB-6

Spark Plug, Standard Series, Gasket Seat, 18mm Thread, .375 in. Reach, Non-Resistor, Each

Part Number: NGK-2910

5.0 out of 5 stars ( 1 )

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NGK Standard Series Spark Plugs AP7FS

Spark Plug, Standard Series, Tapered Seat, 18mm Thread, .460 in. Reach, Projected Tip, Non-Resistor, Each

Part Number: NGK-2127

5.0 out of 5 stars ( 2 )

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Champion Industrial Spark Plugs 516

Spark Plug, D16, Industrial and Agricultural, 18mm Thread, .500 in. Reach, Non-Resistor, Each

Part Number: CPN-516

Not Yet Reviewed

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NGK Standard Series Spark Plugs AB-7

Spark Plug, Gasket Seat, 18mm Thread, .472 in. Reach, Each

Part Number: NGK-3010

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Motorcraft Copper Core Spark Plugs BSF44CA

Spark Plug, Copper, Each

Part Number: MOF-SP435A

Not Yet Reviewed

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Autolite Copper Core Spark Plugs 3116

Spark Plug, Copper Core, Resistor, 14mm x 1.25, Gasket Seat, 0.500 in, Reach, Each

Part Number: ATL-3116

4.5 out of 5 stars ( 2 )

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NGK Standard Series Spark Plugs AB-8

Spark Plug, Standard Series, Gasket Seat, 18mm Thread Size, 0.472 in. Reach, Each

Part Number: NGK-7909

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NGK Racing Spark Plugs R8102B-10

Spark Plug, Racing, Copper, 18mm Thread, 0.630 in. Reach, Flat Seat, 1 in. Wrench Size, Each

Part Number: NGK-95746

Not Yet Reviewed

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Champion Copper Plus Spark Plugs 502

Spark Plug, D21, Copper Plus, 18mm Thread, .500 in. Reach, Gasket seat, Each

Part Number: CPN-502

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NGK Standard Series Spark Plugs AB-6 BLYB

Spark Plug, Standard Series, Copper, 18mm Thread, 0.429 in. Reach, Flat Seat, 13/16 in. Wrench Size, Each

Part Number: NGK-92231

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Autolite Copper Core Spark Plugs 373

Spark Plug, Non-Resistor, Nickel Tip, Copper Core, 18mm Thread Size, 0.752 in. Reach, Gasket Seat, Each

Part Number: ATL-373

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Aug 18, 2025 if ordered today

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Estimated Ship Date: Aug 18, 2025 if ordered today

Champion Industrial Spark Plugs 523

Spark Plug, Industrial, Gasket Seat, Nickel Alloy, 18mm Thread Size, Each

Part Number: CPN-523

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Champion Copper Plus Spark Plugs 555

Spark Plug, UD16, Copper Plus, 18mm Thread, .500 in. Reach, Gasket seat, Each

Part Number: CPN-555

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Champion Industrial Spark Plugs 506

USE AUP 373

Part Number: CPN-506

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Motorcraft Nickel Alloy Spark Plugs BSF3AX

Spark Plug, Nickel Alloy, 18mm Thread Size, 0.460 in. Reach, Each

Part Number: MOF-SP414AX

Not Yet Reviewed

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Motorcraft Nickel Alloy Spark Plugs BSF42CX

SPARK PLUG

Part Number: MOF-SP420X

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Spark Plug, Industrial, Nickel Copper Alloy, 18mm Thread, 0.531 in. Reach, Flat Seat, 7/8 in. Wrench Size, Each

Part Number: CPN-204

Not Yet Reviewed

Estimated Ship Date: Aug 14, 2025 if ordered today

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Estimated Ship Date: Aug 14, 2025 if ordered today