{"product_id":"midland-black-malleable-iron-locknut","title":"Midland Black Malleable Iron Locknut","description":"\u003cdiv style=\"font-family:sans-serif;max-width:900px;\"\u003e\n\u003cdiv style=\"border-left:4px solid #1a1a1a;padding:10px 16px;background:#f8f8f8;margin-bottom:18px;font-size:1rem;font-weight:600;line-height:1.9;\"\u003e\n\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e \u003cstrong\u003eIn Stock – Fast Shipping from Multiple U.S. Warehouses\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e \u003cstrong\u003eContractor-Grade Black Malleable Iron – Threaded NPT\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e \u003cstrong\u003eBulk Pricing Available – Multiple Sizes In Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size:0.92rem;font-weight:700;color:#c0392b;margin:0 0 16px;\"\u003eHigh Demand Item – Frequently Reordered by Plumbing and Gas Contractors\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;line-height:1.7;\"\u003eThe Midland Black Malleable Iron Locknut is a threaded nut used to lock and secure fittings, flanges, and pipe connections in black iron piping systems. Available in multiple sizes — select from the dropdown above.\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;line-height:1.7;\"\u003eBlack malleable iron construction with NPT threads. Used to secure and lock threaded connections in place. Conforms to ASTM A197.\u003c\/p\u003e\n\u003ch2 style=\"font-size:1.5rem;font-weight:900;text-transform:uppercase;margin-top:28px;\"\u003eApplications\u003c\/h2\u003e\n\u003cul style=\"font-size:1.1rem;line-height:1.8;\"\u003e\n\u003cli\u003eSecuring threaded fittings and flanges in gas piping\u003c\/li\u003e\n\u003cli\u003eLocking pipe connections in compressed air systems\u003c\/li\u003e\n\u003cli\u003eGeneral plumbing and mechanical piping applications\u003c\/li\u003e\n\u003cli\u003eIndustrial piping installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background:#fff3f3;border-left:4px solid #c0392b;padding:12px 16px;margin:20px 0;\"\u003e\n\u003cstrong style=\"color:#c0392b;font-size:1rem;\"\u003eIMPORTANT:\u003c\/strong\u003e\u003cul style=\"font-size:1.1rem;line-height:1.8;margin:6px 0 0;\"\u003e\n\u003cli\u003eFor low-pressure applications only — not rated for high-pressure service\u003c\/li\u003e\n\u003cli\u003eBlack iron finish — not suitable for outdoor or corrosive environments without additional protection\u003c\/li\u003e\n\u003cli\u003eAlways verify local code compliance before installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size:1.5rem;font-weight:900;text-transform:uppercase;margin-top:28px;\"\u003eKey Features\u003c\/h2\u003e\n\u003cul style=\"font-size:1.1rem;line-height:1.8;\"\u003e\n\u003cli\u003eBlack malleable iron — ASTM A197\u003c\/li\u003e\n\u003cli\u003eNPT threads\u003c\/li\u003e\n\u003cli\u003eSecures and locks threaded connections\u003c\/li\u003e\n\u003cli\u003eMultiple sizes available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size:1.5rem;font-weight:900;text-transform:uppercase;margin-top:28px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp style=\"font-size:1.1rem;font-weight:700;\"\u003eWhat is a locknut used for?\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;\"\u003eThreaded onto a fitting or pipe to lock and secure the connection — prevents loosening.\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;font-weight:700;\"\u003eWhat thread type?\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;\"\u003eNPT threads.\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;font-weight:700;\"\u003eAre these galvanized?\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;\"\u003eNo — black iron finish.\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;font-weight:700;\"\u003eWhat standards?\u003c\/p\u003e\n\u003cp style=\"font-size:1.1rem;\"\u003eASTM A197.\u003c\/p\u003e\n\u003ch2 style=\"font-size:1.5rem;font-weight:900;text-transform:uppercase;margin-top:28px;\"\u003eWhy Contractors Choose This Product\u003c\/h2\u003e\n\u003cul style=\"font-size:1.1rem;line-height:1.8;\"\u003e\n\u003cli\u003eLocks threaded connections securely\u003c\/li\u003e\n\u003cli\u003eNPT compatibility with standard fittings\u003c\/li\u003e\n\u003cli\u003eStocked in 1\/2\" through 2\"\u003c\/li\u003e\n\u003cli\u003eASTM A197 conforming\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"border-left:4px solid #e87722;padding:10px 16px;background:#fff8f2;margin-top:24px;font-size:1rem;font-weight:600;line-height:1.9;\"\u003e\n\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e In Stock – Ready to Ship\u003cbr\u003e\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e Bulk Pricing Available\u003cbr\u003e\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e Fast Shipping from Multiple U.S. Warehouses\u003cbr\u003e\u003cspan style=\"color:#e87722;font-weight:700;\"\u003e✔\u003c\/span\u003e Built for Contractors, Not DIY\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midland Industries","offers":[{"title":"1\/2\"","offer_id":51560816345405,"sku":null,"price":1.66,"currency_code":"USD","in_stock":true},{"title":"3\/4\"","offer_id":51560816378173,"sku":null,"price":1.78,"currency_code":"USD","in_stock":true},{"title":"1-1\/2\"","offer_id":51560816410941,"sku":null,"price":4.02,"currency_code":"USD","in_stock":true},{"title":"2\"","offer_id":51560816443709,"sku":null,"price":6.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0773\/2471\/4301\/files\/MIDLANDINDUSTRIES_65707_c8c58bb0-1375-45fe-a82c-9a5ee77f718a.jpg?v=1775603043","url":"https:\/\/pvfpro.com\/products\/midland-black-malleable-iron-locknut","provider":"PVFPRO","version":"1.0","type":"link"}