{"product_id":"integral-alum-nut-w-3-8in-grip","title":"Mark Williams Integral Aluminum Lug Nut 5\/8-18 3\/8in Grip — Flat Seat Racing","description":"\u003cdiv style=\"background:#f7f7f7;border-left:4px solid #c00000;padding:14px 18px;margin:0 0 18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;font-size:1.1em;\"\u003eAbout Mark Williams\u003c\/h3\u003e\n\u003cp style=\"margin:0;font-size:0.95em;line-height:1.55;\"\u003eMark Williams engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Mark Williams lineup with fast shipping and expert fitment support — order with confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003ePrecision-Fit Aluminum Racing Lug Nuts\u003c\/h2\u003e\u003cp\u003eOptimize your wheel security with the Mark Williams 5\/8-18 integral aluminum lug nut. Featuring a 3\/8in grip length, this lug nut is designed for racing wheels that require a flat seat interface. By utilizing high-strength aluminum, these nuts provide a significant weight reduction over traditional steel alternatives, helping to decrease unsprung weight and improve your vehicle's overall handling and acceleration characteristics.\u003c\/p\u003e\u003ch3\u003eKey Specifications for Racing\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eThread: 5\/8-18 Right Hand\u003c\/li\u003e\n\u003cli\u003eGrip Length: 3\/8in\u003c\/li\u003e\n\u003cli\u003eHex Size: 13\/16in\u003c\/li\u003e\n\u003cli\u003eSeat Type: Flat Seat\u003c\/li\u003e\n\u003cli\u003eDesign: Open-end for quick access\u003c\/li\u003e\n\u003cli\u003eFinish: Durable Black\/Gold Anodized\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe Mark Williams lug nut is a staple in the racing community, known for its consistent performance and reliability. The 3\/8in grip is specifically tailored for wheels requiring that extra bit of thread engagement, providing peace of mind during high-speed passes. The anodized finish not only adds a professional look to your wheel setup but also protects the aluminum from the elements. Whether you are a weekend warrior or a professional racer, using the correct hardware is essential for safety and performance. Ensure your wheels stay put with high-quality fasteners from Mark Williams, found in the extensive catalog at GGCRACING.\u003c\/p\u003e\n\u003cdiv style=\"margin:24px 0;border-top:1px solid #eee;padding-top:18px;\"\u003e\n\u003ch3 style=\"margin:0 0 6px;\"\u003eOften bought with\u003c\/h3\u003e\n\u003cp style=\"font-size:0.9em;color:#555;margin:0 0 8px;\"\u003eOther popular Mark Williams products customers consider together:\u003c\/p\u003e\n\u003cul style=\"padding-left:20px;margin:0;\"\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/quick-rel-steering-hub\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams Quick Release Steering Hub 3\/4in Shaft — 4-Bolt Wheel\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/gt-5-bolt-quick-release\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams GT 5-Bolt Quick Release - Grant GT 3\/4in Shaft — Black Anodized Aluminum\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/q-r-steering-hub-6-hole-sparco-momo-str-wheels\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams SFI 42.1 Quick Release Hub — Fits Sparco\/Momo 6-Hole\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/gm-8-5-10-pinion-yoke\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams 1350 U-Joint Pinion Yoke — GM 8.5\" 10-Bolt, 30 Spline\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:4px 0;\"\u003e\u003ca href=\"https:\/\/ggcracing.com\/products\/th400-t-10-trans-yoke\" style=\"color:#0066cc;text-decoration:none;\"\u003eMark Williams TH400 T-10 Slip Yoke 32 Spline — 1350 U-Joint\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"Mark Williams Integral Aluminum Lug Nut 5\/8-18 3\/8in Grip \\u2014 Flat Seat Racing\",\"description\":\"Get the perfect fit with Mark Williams 5\/8-18 aluminum lug nuts featuring a 3\/8in grip. Durable, lightweight, and race-ready. Shop at GGCRACING!\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Mark Williams\"},\"mpn\":\"51521\",\"url\":\"https:\/\/ggcracing.com\/products\/integral-alum-nut-w-3-8in-grip\",\"offers\":{\"@type\":\"Offer\",\"price\":\"15.99\",\"priceCurrency\":\"USD\",\"availability\":\"https:\/\/schema.org\/InStock\",\"url\":\"https:\/\/ggcracing.com\/products\/integral-alum-nut-w-3-8in-grip\",\"sku\":\"BJFM_51521\"}}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/ggcracing.com\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Wheels\",\"item\":\"https:\/\/ggcracing.com\/collections\/wheels\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Mark Williams\",\"item\":\"https:\/\/ggcracing.com\/collections\/vendors?q=Mark+Williams\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Mark Williams Integral Aluminum Lug Nut 5\/8-18 3\/8in Grip \\u2014 Flat Seat Racing\",\"item\":\"https:\/\/ggcracing.com\/products\/integral-alum-nut-w-3-8in-grip\"}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does the Mark Williams Integral Aluminum Lug Nut 5\/8-18 3\/8in Grip \\u2014 Flat Seat Racing fit my vehicle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Compatibility depends on your exact year, make, and model. Contact our experts at GGCRACING with your VIN and we'll verify before you order.\"}},{\"@type\":\"Question\",\"name\":\"How long is shipping for Mark Williams?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. 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