{"product_id":"autolite-platinum-spark-plug-ht15-high-thread-pro®","title":"Autolite Platinum Spark Plug – HT15 (High Thread Pro®)","description":"\u003cp data-start=\"130\" data-end=\"450\"\u003e\u003cstrong data-start=\"130\" data-end=\"146\"\u003eDescription:\u003c\/strong\u003e\u003cbr data-start=\"146\" data-end=\"149\"\u003eThe Autolite HT15 Platinum Spark Plug is part of Autolite’s High Thread Pro® series, an OE patented design developed specifically for Ford 3-valve (3V) engines. This advanced design improves engine durability, ignition performance, and heat management while helping maintain optimal engine efficiency.\u003c\/p\u003e\n\u003cp data-start=\"452\" data-end=\"737\"\u003eThe fine-wire platinum center electrode delivers a more focused ignition spark for improved combustion efficiency, smoother operation, and extended service life. A copper core center electrode enhances heat transfer, helping maintain proper operating temperatures and reducing fouling.\u003c\/p\u003e\n\u003cp data-start=\"739\" data-end=\"1191\"\u003eThe High Thread Pro® design positions the threads above the cylinder head seating surface, allowing for a stronger compressive seal that improves heat transfer and durability. The specially engineered ground strap further enhances heat dissipation compared to standard J-gap spark plugs. Combined with a high alumina ceramic insulator, the HT15 spark plug provides excellent dielectric strength, thermal conductivity, and reliable ignition performance.\u003c\/p\u003e\n\u003cp data-start=\"1193\" data-end=\"1206\"\u003e\u003cstrong data-start=\"1193\" data-end=\"1206\"\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1208\" data-end=\"1705\"\u003e\n\u003cli data-section-id=\"mmq790\" data-start=\"1208\" data-end=\"1277\"\u003e\n\u003cp data-start=\"1210\" data-end=\"1277\"\u003eHigh Thread Pro® OE patented design developed for Ford 3V engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1q4q3ks\" data-start=\"1278\" data-end=\"1362\"\u003e\n\u003cp data-start=\"1280\" data-end=\"1362\"\u003eFine-wire platinum center electrode for focused ignition and longer service life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"50w2va\" data-start=\"1363\" data-end=\"1441\"\u003e\n\u003cp data-start=\"1365\" data-end=\"1441\"\u003eCopper core center electrode improves heat transfer and fouling resistance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"167ack4\" data-start=\"1442\" data-end=\"1526\"\u003e\n\u003cp data-start=\"1444\" data-end=\"1526\"\u003eImproved ground strap design enhances heat dissipation over standard J-gap plugs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"16o3m39\" data-start=\"1527\" data-end=\"1615\"\u003e\n\u003cp data-start=\"1529\" data-end=\"1615\"\u003eThread placement above the cylinder head seating creates a stronger compressive seal\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"2zrbc9\" data-start=\"1616\" data-end=\"1705\"\u003e\n\u003cp data-start=\"1618\" data-end=\"1705\"\u003eHigh alumina ceramic insulator provides excellent thermal conductivity and insulation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1707\" data-end=\"1734\"\u003e\u003cstrong data-start=\"1707\" data-end=\"1734\"\u003eProduct Specifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1736\" data-end=\"2474\"\u003e\n\u003cli data-section-id=\"gsotq6\" data-start=\"1736\" data-end=\"1757\"\u003e\n\u003cp data-start=\"1738\" data-end=\"1757\"\u003ePart number: HT15\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"t1nkhe\" data-start=\"1758\" data-end=\"1777\"\u003e\n\u003cp data-start=\"1760\" data-end=\"1777\"\u003eBrand: Autolite\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1vnl5fm\" data-start=\"1778\" data-end=\"1815\"\u003e\n\u003cp data-start=\"1780\" data-end=\"1815\"\u003eProduct type: Platinum spark plug\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"x3vjbp\" data-start=\"1816\" data-end=\"1858\"\u003e\n\u003cp data-start=\"1818\" data-end=\"1858\"\u003eCenter electrode core material: Copper\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"ldp2q6\" data-start=\"1859\" data-end=\"1902\"\u003e\n\u003cp data-start=\"1861\" data-end=\"1902\"\u003eCenter electrode tip material: Platinum\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"7n510h\" data-start=\"1903\" data-end=\"1941\"\u003e\n\u003cp data-start=\"1905\" data-end=\"1941\"\u003eCenter electrode design: Fine wire\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"3au8g6\" data-start=\"1942\" data-end=\"1984\"\u003e\n\u003cp data-start=\"1944\" data-end=\"1984\"\u003eGround electrode core material: Nickel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"17jmp0w\" data-start=\"1985\" data-end=\"2026\"\u003e\n\u003cp data-start=\"1987\" data-end=\"2026\"\u003eGround electrode tip material: Nickel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1ibjk3h\" data-start=\"2027\" data-end=\"2059\"\u003e\n\u003cp data-start=\"2029\" data-end=\"2059\"\u003eGround configuration: Single\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"55pk7u\" data-start=\"2060\" data-end=\"2092\"\u003e\n\u003cp data-start=\"2062\" data-end=\"2092\"\u003eGround electrode quantity: 1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"n9kkd4\" data-start=\"2093\" data-end=\"2119\"\u003e\n\u003cp data-start=\"2095\" data-end=\"2119\"\u003eThread diameter: 12 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1vqolju\" data-start=\"2120\" data-end=\"2142\"\u003e\n\u003cp data-start=\"2122\" data-end=\"2142\"\u003eSeat type: Tapered\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"rfiaup\" data-start=\"2143\" data-end=\"2166\"\u003e\n\u003cp data-start=\"2145\" data-end=\"2166\"\u003eWasher included: No\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"3pg7j7\" data-start=\"2167\" data-end=\"2186\"\u003e\n\u003cp data-start=\"2169\" data-end=\"2186\"\u003eReach: 0.702 in\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"ijsas4\" data-start=\"2187\" data-end=\"2208\"\u003e\n\u003cp data-start=\"2189\" data-end=\"2208\"\u003eHex size: 9\/16 in\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"dujk1e\" data-start=\"2209\" data-end=\"2231\"\u003e\n\u003cp data-start=\"2211\" data-end=\"2231\"\u003eResistor type: Yes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"pg2zbh\" data-start=\"2232\" data-end=\"2257\"\u003e\n\u003cp data-start=\"2234\" data-end=\"2257\"\u003eResistance: 5000 ohms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"wq3ycj\" data-start=\"2258\" data-end=\"2284\"\u003e\n\u003cp data-start=\"2260\" data-end=\"2284\"\u003ePre-gap size: 0.045 in\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"e3s6de\" data-start=\"2285\" data-end=\"2316\"\u003e\n\u003cp data-start=\"2287\" data-end=\"2316\"\u003eManufacturer heat range: 11\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"sjdq26\" data-start=\"2317\" data-end=\"2348\"\u003e\n\u003cp data-start=\"2319\" data-end=\"2348\"\u003eInsulator material: Ceramic\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1tgnobm\" data-start=\"2349\" data-end=\"2411\"\u003e\n\u003cp data-start=\"2351\" data-end=\"2411\"\u003eCenter electrode projection: Extra-long special projection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1b7wdfo\" data-start=\"2412\" data-end=\"2459\"\u003e\n\u003cp data-start=\"2414\" data-end=\"2459\"\u003eElectrical terminal type: Non-removable nut\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"vb0oei\" data-start=\"2460\" data-end=\"2474\"\u003e\n\u003cp data-start=\"2462\" data-end=\"2474\"\u003eSkirt: Yes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AUTOLITE","offers":[{"title":"Default Title","offer_id":46280564736199,"sku":"ELE1931","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/2277\/5751\/files\/Screenshot2026-03-11152945.png?v=1773268155","url":"https:\/\/mainstreeteshop.com\/products\/autolite-platinum-spark-plug-ht15-high-thread-pro%c2%ae","provider":"MAIN STREET ESHOP","version":"1.0","type":"link"}