{"product_id":"champion-agricultural-spark-plug-502","title":"Champion Agricultural Spark Plug 502","description":"\u003ch2 data-section-id=\"rmw5tv\" data-start=\"164\" data-end=\"178\"\u003eDescription\u003c\/h2\u003e\n\u003cp data-start=\"179\" data-end=\"568\"\u003eThe \u003cstrong data-start=\"183\" data-end=\"216\"\u003eChampion 502 Spark Plug (D21)\u003c\/strong\u003e is engineered for \u003cstrong data-start=\"235\" data-end=\"296\"\u003eindustrial, agricultural, and vintage engine applications\u003c\/strong\u003e operating in high-compression and heavy-load environments. Built with durable nickel electrodes and rugged construction, this spark plug is designed to withstand the demanding conditions often found in agricultural machinery, marine engines, and early automotive engines.\u003c\/p\u003e\n\u003cp data-start=\"570\" data-end=\"941\"\u003eChampion industrial and agricultural spark plugs benefit from \u003cstrong data-start=\"632\" data-end=\"668\"\u003eFederal-Mogul global engineering\u003c\/strong\u003e, incorporating durable materials and designs intended for long-lasting performance in harsh environments. The D21 spark plug provides consistent ignition performance, helping maintain efficient combustion in engines that operate under high temperature and load conditions.\u003c\/p\u003e\n\u003cp data-start=\"943\" data-end=\"1132\"\u003eWith an \u003cstrong data-start=\"951\" data-end=\"976\"\u003e18 mm thread diameter\u003c\/strong\u003e, \u003cstrong data-start=\"978\" data-end=\"994\"\u003e0.5 in reach\u003c\/strong\u003e, and \u003cstrong data-start=\"1000\" data-end=\"1027\"\u003eflat seat configuration\u003c\/strong\u003e, the Champion 502 is commonly used in vintage vehicles, industrial equipment, and select marine engines.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1d7mrtu\" data-start=\"1134\" data-end=\"1145\"\u003eFeatures\u003c\/h2\u003e\n\u003cul data-start=\"1146\" data-end=\"1511\"\u003e\n\u003cli data-section-id=\"11xa3gc\" data-start=\"1146\" data-end=\"1221\"\u003e\n\u003cp data-start=\"1148\" data-end=\"1221\"\u003eDesigned for \u003cstrong data-start=\"1161\" data-end=\"1219\"\u003ehigh compression and aggressive operating environments\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1is5y1p\" data-start=\"1222\" data-end=\"1263\"\u003e\n\u003cp data-start=\"1224\" data-end=\"1263\"\u003eDurable nickel electrode construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"titl0f\" data-start=\"1264\" data-end=\"1344\"\u003e\n\u003cp data-start=\"1266\" data-end=\"1344\"\u003eEngineered for \u003cstrong data-start=\"1281\" data-end=\"1342\"\u003eindustrial, agricultural, and vintage engine applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"fqlkke\" data-start=\"1345\" data-end=\"1389\"\u003e\n\u003cp data-start=\"1347\" data-end=\"1389\"\u003eManufactured for long-lasting durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1472mvb\" data-start=\"1390\" data-end=\"1440\"\u003e\n\u003cp data-start=\"1392\" data-end=\"1440\"\u003eBacked by \u003cstrong data-start=\"1402\" data-end=\"1438\"\u003eFederal-Mogul global engineering\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"199o4a8\" data-start=\"1441\" data-end=\"1511\"\u003e\n\u003cp data-start=\"1443\" data-end=\"1511\"\u003eProvides reliable ignition performance under heavy load conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"1a3ueyz\" data-start=\"1513\" data-end=\"1530\"\u003eSpecifications\u003c\/h2\u003e\n\u003cp data-start=\"1532\" data-end=\"1721\"\u003e\u003cstrong data-start=\"1532\" data-end=\"1542\"\u003eBrand:\u003c\/strong\u003e Champion\u003cbr data-start=\"1551\" data-end=\"1554\"\u003e\u003cstrong data-start=\"1554\" data-end=\"1570\"\u003ePart Number:\u003c\/strong\u003e 502\u003cbr data-start=\"1574\" data-end=\"1577\"\u003e\u003cstrong data-start=\"1577\" data-end=\"1591\"\u003ePlug Type:\u003c\/strong\u003e D21\u003cbr data-start=\"1595\" data-end=\"1598\"\u003e\u003cstrong data-start=\"1598\" data-end=\"1617\"\u003eClassification:\u003c\/strong\u003e Champion Agricultural Plugs\u003cbr data-start=\"1645\" data-end=\"1648\"\u003e\u003cstrong data-start=\"1648\" data-end=\"1663\"\u003eGrade Type:\u003c\/strong\u003e Standard Replacement\u003cbr data-start=\"1684\" data-end=\"1687\"\u003e\u003cstrong data-start=\"1687\" data-end=\"1708\"\u003ePart Description:\u003c\/strong\u003e Spark Plug\u003c\/p\u003e\n\u003ch3 data-section-id=\"1w45zwv\" data-start=\"1723\" data-end=\"1751\"\u003eElectrode Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1752\" data-end=\"1949\"\u003e\n\u003cli data-section-id=\"1w81wf2\" data-start=\"1752\" data-end=\"1793\"\u003e\n\u003cp data-start=\"1754\" data-end=\"1793\"\u003eCenter Electrode Tip Material: Nickel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"42bjef\" data-start=\"1794\" data-end=\"1831\"\u003e\n\u003cp data-start=\"1796\" data-end=\"1831\"\u003eCenter Electrode Design: Standard\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1tcgx5m\" data-start=\"1832\" data-end=\"1864\"\u003e\n\u003cp data-start=\"1834\" data-end=\"1864\"\u003eGround Electrode Quantity: 1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"psgbmu\" data-start=\"1865\" data-end=\"1907\"\u003e\n\u003cp data-start=\"1867\" data-end=\"1907\"\u003eGround Electrode Core Material: Nickel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"es7l3k\" data-start=\"1908\" data-end=\"1949\"\u003e\n\u003cp data-start=\"1910\" data-end=\"1949\"\u003eGround Electrode Tip Material: Nickel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"bpec4l\" data-start=\"1951\" data-end=\"1965\"\u003eDimensions\u003c\/h3\u003e\n\u003cul data-start=\"1966\" data-end=\"2080\"\u003e\n\u003cli data-section-id=\"ggnyf8\" data-start=\"1966\" data-end=\"2007\"\u003e\n\u003cp data-start=\"1968\" data-end=\"2007\"\u003eThread Diameter: 18.000 mm \/ 0.709 in\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1cq6m5f\" data-start=\"2008\" data-end=\"2025\"\u003e\n\u003cp data-start=\"2010\" data-end=\"2025\"\u003eReach: 0.5 in\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"12ns31y\" data-start=\"2026\" data-end=\"2045\"\u003e\n\u003cp data-start=\"2028\" data-end=\"2045\"\u003eSeat Type: Flat\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1h15ne9\" data-start=\"2046\" data-end=\"2080\"\u003e\n\u003cp data-start=\"2048\" data-end=\"2080\"\u003eHex Size: 0.875 in \/ 22.230 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1w4gt8e\" data-start=\"2082\" data-end=\"2097\"\u003ePerformance\u003c\/h3\u003e\n\u003cul data-start=\"2098\" data-end=\"2188\"\u003e\n\u003cli data-section-id=\"1eujwdd\" data-start=\"2098\" data-end=\"2129\"\u003e\n\u003cp data-start=\"2100\" data-end=\"2129\"\u003eManufacturer Heat Range: 21\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1t4bhna\" data-start=\"2130\" data-end=\"2166\"\u003e\n\u003cp data-start=\"2132\" data-end=\"2166\"\u003ePre-Gap Size: 0.025 in \/ 0.64 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1fym0qk\" data-start=\"2167\" data-end=\"2188\"\u003e\n\u003cp data-start=\"2169\" data-end=\"2188\"\u003eResistor Type: No\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1hc7erh\" data-start=\"2190\" data-end=\"2212\"\u003eAdditional Details\u003c\/h3\u003e\n\u003cul data-start=\"2213\" data-end=\"2301\"\u003e\n\u003cli data-section-id=\"2lg8h2\" data-start=\"2213\" data-end=\"2256\"\u003e\n\u003cp data-start=\"2215\" data-end=\"2256\"\u003eElectrical Terminal Type: Removable Nut\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"cf799m\" data-start=\"2257\" data-end=\"2274\"\u003e\n\u003cp data-start=\"2259\" data-end=\"2274\"\u003eHex Type: Hex\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"198zmx6\" data-start=\"2275\" data-end=\"2301\"\u003e\n\u003cp data-start=\"2277\" data-end=\"2301\"\u003eSubject to Prop 65: No\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"mu966k\" data-start=\"2303\" data-end=\"2318\"\u003eApplications\u003c\/h2\u003e\n\u003cp data-start=\"2319\" data-end=\"2485\"\u003eThe \u003cstrong data-start=\"2323\" data-end=\"2345\"\u003eChampion 502 (D21)\u003c\/strong\u003e spark plug is commonly used in \u003cstrong data-start=\"2377\" data-end=\"2451\"\u003evintage automotive engines, agricultural equipment, and marine engines\u003c\/strong\u003e, including select models such as:\u003c\/p\u003e\n\u003ch3 data-section-id=\"7rdqbn\" data-start=\"2487\" data-end=\"2509\"\u003eVintage Automotive\u003c\/h3\u003e\n\u003cul data-start=\"2510\" data-end=\"2852\"\u003e\n\u003cli data-section-id=\"1i418nf\" data-start=\"2510\" data-end=\"2536\"\u003e\n\u003cp data-start=\"2512\" data-end=\"2536\"\u003eBuick Series 40 (1930)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"nmhqa2\" data-start=\"2537\" data-end=\"2563\"\u003e\n\u003cp data-start=\"2539\" data-end=\"2563\"\u003eBuick Series 50 (1930)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1l0bybt\" data-start=\"2564\" data-end=\"2590\"\u003e\n\u003cp data-start=\"2566\" data-end=\"2590\"\u003eBuick Series 60 (1930)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1a7p6ri\" data-start=\"2591\" data-end=\"2621\"\u003e\n\u003cp data-start=\"2593\" data-end=\"2621\"\u003eHudson Model O (1927–1928)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"3u4ode\" data-start=\"2622\" data-end=\"2652\"\u003e\n\u003cp data-start=\"2624\" data-end=\"2652\"\u003eHudson Model S (1927–1928)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1hjqvpy\" data-start=\"2653\" data-end=\"2685\"\u003e\n\u003cp data-start=\"2655\" data-end=\"2685\"\u003eHudson Super Six (1922–1926)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1m6dzr0\" data-start=\"2686\" data-end=\"2712\"\u003e\n\u003cp data-start=\"2688\" data-end=\"2712\"\u003eNash Series 660 (1931)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"dxw837\" data-start=\"2713\" data-end=\"2739\"\u003e\n\u003cp data-start=\"2715\" data-end=\"2739\"\u003eNash Series 870 (1931)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"nduf1s\" data-start=\"2740\" data-end=\"2766\"\u003e\n\u003cp data-start=\"2742\" data-end=\"2766\"\u003eNash Series 960 (1932)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1j0eho1\" data-start=\"2767\" data-end=\"2793\"\u003e\n\u003cp data-start=\"2769\" data-end=\"2793\"\u003eNash Series 970 (1932)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1dvum9j\" data-start=\"2794\" data-end=\"2822\"\u003e\n\u003cp data-start=\"2796\" data-end=\"2822\"\u003ePontiac Model 401 (1931)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"l4pf95\" data-start=\"2823\" data-end=\"2852\"\u003e\n\u003cp data-start=\"2825\" data-end=\"2852\"\u003ePontiac Model 6-30 B (1930)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"7uqjzj\" data-start=\"2854\" data-end=\"2885\"\u003eMarine \/ Industrial Engines\u003c\/h3\u003e\n\u003cul data-start=\"2886\" data-end=\"3032\"\u003e\n\u003cli data-section-id=\"ajynuh\" data-start=\"2886\" data-end=\"2958\"\u003e\n\u003cp data-start=\"2888\" data-end=\"2958\"\u003eBritish Seagull outboard engines (Forty, Forty Plus, Century series)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"q72q7n\" data-start=\"2959\" data-end=\"2992\"\u003e\n\u003cp data-start=\"2961\" data-end=\"2992\"\u003ePalmer-Greenwich PW27 engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"xe5a7j\" data-start=\"2993\" data-end=\"3032\"\u003e\n\u003cp data-start=\"2995\" data-end=\"3032\"\u003eBritish Anzani Super-Single engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3034\" data-end=\"3129\"\u003eAlways confirm compatibility by \u003cstrong data-start=\"3066\" data-end=\"3108\"\u003eengine type, model, and specifications\u003c\/strong\u003e before installation.\u003c\/p\u003e","brand":"CHAMPION","offers":[{"title":"Default Title","offer_id":46286222950599,"sku":"ELE1989","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/2277\/5751\/files\/Screenshot2026-03-12155406.png?v=1773355916","url":"https:\/\/mainstreeteshop.com\/products\/champion-agricultural-spark-plug-502","provider":"MAIN STREET ESHOP","version":"1.0","type":"link"}