{"product_id":"value-collection-r52001618-heavy-hex-lock-nut-5-16-18","title":"Value Collection R52001618 Heavy Hex Lock Nut 5\/16-18","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION R52001618 is a heavy hex lock nut with a nylon insert locking mechanism, designed for 5\/16-18 UNC threaded fastener applications. Manufactured from Grade 2 steel with a zinc finish for corrosion resistance, this nut measures 7\/16 inches in height and 9\/16 inches across the flats. The nylon insert deforms around the mating thread to resist loosening caused by vibration or torque reversal without requiring a secondary locking device. It is installed by maintenance technicians, industrial mechanics, and trade professionals working with standard inch-series fastener assemblies.\u003c\/p\u003e\n\u003cp\u003eThis heavy hex lock nut is suited for general-purpose mechanical and structural fastening in residential, commercial, and light industrial applications. The right-hand thread direction conforms to standard UNC specifications, making it compatible with common 5\/16-18 threaded bolts, studs, and threaded rod. It is widely used in HVAC equipment assembly, electrical enclosure mounting, plumbing support structures, and similar trade applications where vibration resistance is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNylon insert locking style resists loosening under vibration without secondary hardware\u003c\/li\u003e\n  \u003cli\u003eGrade 2 steel construction provides reliable strength for general-purpose fastening\u003c\/li\u003e\n  \u003cli\u003eZinc finish offers corrosion resistance for both indoor and protected outdoor environments\u003c\/li\u003e\n  \u003cli\u003eHeavy hex profile provides additional wrench engagement surface compared to standard hex\u003c\/li\u003e\n  \u003cli\u003eRight-hand UNC thread direction for compatibility with standard 5\/16-18 fasteners\u003c\/li\u003e\n  \u003cli\u003eWidth across flats of 9\/16 inches fits common wrench and socket sizes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard UNC replacement or stock nut for use with 5\/16-18 threaded bolts, studs, and threaded rod in general-purpose mechanical and trade fastening applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires a standard 9\/16-inch wrench or socket. Nylon insert lock nuts are single-use by design and should not be reused after removal, as the insert loses locking effectiveness once deformed. Ensure mating threads are clean and free of damage before installation. This fastener does not meet military specifications and should not be substituted in applications requiring mil-spec hardware.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 5\/16-18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFastener Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNut Type\u003c\/strong\u003e: Heavy Hex Lock Nut\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocking Style\u003c\/strong\u003e: Nylon Insert\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 7\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth Across Flats\u003c\/strong\u003e: 9\/16 inches (0.5510 to 0.5660 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth Across Points\u003c\/strong\u003e: 0.6240 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Grade 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Nylon\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Zinc\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.021 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: R52001618\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51689333260594,"sku":"R52001618","price":1120.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/13e487ea302b090f1989427a9daa4dd2.jpg?v=1788257723","url":"https:\/\/voomisupply.com\/products\/value-collection-r52001618-heavy-hex-lock-nut-5-16-18","provider":"Voomi Supply","version":"1.0","type":"link"}