NGK spark plug standard 10mm thread promotes efficient heat dissipation for reliable starts
NGK spark plug resistor 6689 supports consistent ignition with corrosion-resistant design
NGK spark plug standard 10mm thread promotes efficient heat dissipation for reliable starts
NGK spark plug resistor 6689 supports consistent ignition with corrosion-resistant design

NGK Spark Plug – Standard 10mm, 0.749 in Reach, Gasket Seat, Resistor (6689)

OverviewNGK’s standard spark plug (Stock Number 6689) is designed for dependable starts and steady operation. With a...
Vendor: NGK
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NGK spark plug standard 10mm thread promotes efficient heat dissipation for reliable starts

NGK Spark Plug – Standard 10mm, 0.749 in Reach, Gasket Seat, Resistor (6689)

£26.94
NGK spark plug standard 10mm thread promotes efficient heat dissipation for reliable starts
NGK spark plug resistor 6689 supports consistent ignition with corrosion-resistant design

NGK Spark Plug – Standard 10mm, 0.749 in Reach, Gasket Seat, Resistor (6689)

£26.94
Description
Description
x

Overview

NGK’s standard spark plug (Stock Number 6689) is designed for dependable starts and steady operation. With a 10 mm threaded body and a gasket seat, it fits a broad range of engines and helps maintain a consistent ignition condition. The resistor design contributes to stable electrical performance across modern ignition systems.

Design that matters

The plug features a 98% pure copper core that speeds heat dissipation, supporting reliable starts and helping prevent overheating in typical driving conditions.

A high-grade alumina silicate ceramic insulator provides rugged strength and efficient heat transfer, so the plug remains stable under heat and vibration.

Cold-rolled threads are engineered to reduce cross-threading and protect cylinder heads during installation, while trivalent plating eliminates the need for anti-seize and corrugated ribs help prevent flashover.

Durability and precision

With a gasket seat and the stated 10 mm thread, this NGK plug offers a precise fit for many engines, contributing to a reliable seal and consistent performance.

  • 98% copper core for efficient heat dissipation
  • Durable ceramic insulator for heat resistance
  • Cold-rolled threads to prevent cross-threading
  • Trivalent plating reduces maintenance and resists corrosion
  • Corrugated ribs help prevent electrical flashover

What you get

Quantity: 1 per package. Stock Number 6689. Resistor design supports stable ignition across a range of ignition systems.

  • Resistor spark plug for steady electrical performance
  • 10 mm thread and gasket seat for a proper seal
  • Engineered to endure typical heat and vibration

Usage and compatibility

When selecting a plug, verify fitment with your engine specification and replacement schedule. This NGK standard plug is a practical option for many engines that require a 10 mm, gasket-seated, resistor plug.

FAQ

Q: What are the standout features of the NGK 6689 spark plug?

A: Uses a 98% copper core for heat dissipation, durable ceramic insulator, cold-rolled threads, trivalent plating, and a resistor for steady ignition.

Q: How many NGK 6689 plugs come in a package?

A: One plug per package.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

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When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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