{"product_id":"ngk-spark-plug-standard-10mm-0-749-in-reach-gasket-seat-resistor-6689","title":"NGK Spark Plug – Standard 10mm, 0.749 in Reach, Gasket Seat, Resistor (6689)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eNGK’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.\u003c\/p\u003e\u003ch2\u003eDesign that matters\u003c\/h2\u003e\u003cp\u003eThe plug features a 98% pure copper core that speeds heat dissipation, supporting reliable starts and helping prevent overheating in typical driving conditions.\u003c\/p\u003e\u003cp\u003eA high-grade alumina silicate ceramic insulator provides rugged strength and efficient heat transfer, so the plug remains stable under heat and vibration.\u003c\/p\u003e\u003cp\u003eCold-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.\u003c\/p\u003e\u003ch2\u003eDurability and precision\u003c\/h2\u003e\u003cp\u003eWith 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.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e98% copper core for efficient heat dissipation\u003c\/li\u003e\n\u003cli\u003eDurable ceramic insulator for heat resistance\u003c\/li\u003e\n\u003cli\u003eCold-rolled threads to prevent cross-threading\u003c\/li\u003e\n\u003cli\u003eTrivalent plating reduces maintenance and resists corrosion\u003c\/li\u003e\n\u003cli\u003eCorrugated ribs help prevent electrical flashover\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat you get\u003c\/h2\u003e\u003cp\u003eQuantity: 1 per package. Stock Number 6689. Resistor design supports stable ignition across a range of ignition systems.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eResistor spark plug for steady electrical performance\u003c\/li\u003e\n\u003cli\u003e10 mm thread and gasket seat for a proper seal\u003c\/li\u003e\n\u003cli\u003eEngineered to endure typical heat and vibration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eUsage and compatibility\u003c\/h2\u003e\u003cp\u003eWhen 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.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What are the standout features of the NGK 6689 spark plug?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Uses a 98% copper core for heat dissipation, durable ceramic insulator, cold-rolled threads, trivalent plating, and a resistor for steady ignition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many NGK 6689 plugs come in a package?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: One plug per package.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":42465519272021,"sku":"B001RMAEIS","price":26.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/ngk-spark-plug-standard-10mm-thread.jpg?v=1778010612","url":"https:\/\/plentytorque.co.uk\/products\/ngk-spark-plug-standard-10mm-0-749-in-reach-gasket-seat-resistor-6689","provider":"PlentyTorque","version":"1.0","type":"link"}