Spark Plugs - 18mm Spark Plug Thread Size - Free Shipping on Orders Over $109 at Summit Racing

Autolite Copper Core Spark Plugs 45

Spark Plug, Copper Core, Resistor, 18mm x 1.50, Tapered Seat, 0.438 in, Reach, Each

Part Number: ATL-45

5.0 out of 5 stars ( 15 )

Estimated Ship Date: Monday 8/4/2025

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NGK V-Power Spark Plugs WR5

Spark Plug, V-Power, Tapered Seat, 18mm Thread, .429 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-2438

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Monday 8/4/2025

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Autolite Single Platinum Spark Plugs P45

Spark Plug, Single Platinum, Platinum, 18mm Thread, 0.460 in. Reach, Tapered Seat, 13/16 in. Wrench Size, Each

Part Number: ATL-AP45

4.81 out of 5 stars ( 16 )

Estimated Ship Date: Monday 8/4/2025

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NGK Iridium IX Spark Plugs WR5IX

Spark Plug, Iridium IX, Tapered Seat, 18mm Thread, .460 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-7510

4.33 out of 5 stars ( 6 )

Estimated Ship Date: Monday 8/4/2025

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Autolite Copper Core Spark Plugs 46

Spark Plug, Copper Core, Resistor, 18mm x 1.50, Tapered Seat, 0.438 in, Reach, Each

Part Number: ATL-46

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 8/4/2025

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E3 Spark Plugs E3.72

Spark Plug, E3, Tapered Seat, 18mm Thread, 0.430 in. Reach, Projected Tip, Resistor, Each

Part Number: ETP-E3-72

4.7 out of 5 stars ( 23 )

Estimated Ship Date: Monday 8/4/2025

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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 )

Estimated Ship Date: Monday 8/4/2025

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Champion Copper Plus Spark Plugs 22

Spark Plug, RF11YC, Copper Plus, 18mm Thread, .460 in. Reach, Resistor, Ford, Mercury, Each

Part Number: CPN-22

4.4 out of 5 stars ( 5 )

Estimated Ship Date: Monday 8/4/2025

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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 )

Estimated Ship Date: Monday 8/4/2025

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Autolite Double Platinum Spark Plugs PP45

Spark Plug, Double Platinum, 18mm Thread, 0.460 in. Reach, Tapered Seat, 13/16 in. Wrench Size, Each

Part Number: ATL-APP45

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Monday 8/4/2025

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Bosch OE Iridium Spark Plugs 9659

Spark Plug, OE Iridium, Tapered Seat, 18mm Thread, 0.441 in. Reach, Resistor, Each

Part Number: BCH-9659

Not Yet Reviewed

Estimated Ship Date: Monday 8/4/2025

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Autolite Copper Core Spark Plugs 386

Spark Plug, Copper Core, Gasket Seat, 18mm Thread, 0.500 in. Reach, Resistor, Each

Part Number: ATL-386

Not Yet Reviewed

Estimated Ship Date: Monday 8/4/2025

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Autolite Copper Core Spark Plugs 124

Spark Plug, Copper Core, Resistor, Tapered Seat Style, 18mm Thread, 0.460 in. Reach, Dodge, Ford, Each

Part Number: ATL-124

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 8/4/2025

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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 )

Estimated Ship Date: Monday 8/4/2025

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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 )

Estimated Ship Date: Monday 8/4/2025

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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 )

Estimated Ship Date: Monday 8/4/2025

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ACDelco Conventional Resistor Spark Plugs 19362244

Spark Plug, Conventional Resistor, Nickel Alloy Tip, Tapered Seat, 18mm Thread, Each

Part Number: ADO-R83TS

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 8/4/2025

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Champion Copper Plus Spark Plugs 129

Spark Plug, RF10C, Copper Plus, 18mm Thread, .460 in. Reach, Resistor, Ford/Dodge, Each

Part Number: CPN-129

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 8/4/2025

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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

Estimated Ship Date: Monday 8/4/2025

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ACDelco Conventional Resistor Spark Plugs 19362245

Spark Plug, Conventional Resistor, Nickel Alloy Tip, Tapered Seat, 18mm Thread, Each

Part Number: ADO-R85TS

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 8/4/2025

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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

Not Yet Reviewed

Estimated Ship Date: Monday 8/4/2025

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NGK Standard Series Spark Plugs AR6FS

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

Part Number: NGK-3323

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 8/4/2025

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Motorcraft Copper Core Spark Plugs BSF44CA

Spark Plug, Copper, Each

Part Number: MOF-SP435A

Not Yet Reviewed

Estimated Ship Date: Monday 8/4/2025

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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

Estimated Ship Date: Monday 8/4/2025

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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 )

Estimated Ship Date: Monday 8/4/2025

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Estimated Ship Date: Monday 8/4/2025