{"product_id":"e-z-lok-329-1216-thread-locking-insert-3-4-16-unf","title":"E-z Lok 329-1216 Thread Locking Insert 3\/4-16 Unf","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe E-Z LOK 329-1216 is a self-lock wall thread locking insert designed to create a secure, vibration-resistant threaded connection in existing parent material. This insert accepts a 3\/4-16 UNF internal thread and installs via a 1-8 external thread, making it suitable for applications where a standard tapped hole needs to be reinforced or converted to a finer thread pitch. Manufactured from C12L14 carbon steel with a smooth, rolled finish, the 329-1216 measures 25\/32 inches (0.781 inches) in overall length. Licensed HVAC, mechanical, and industrial maintenance technicians install these inserts to restore stripped threads or add thread-locking functionality to assemblies subject to movement or torque load.\u003c\/p\u003e\n\u003cp\u003eThis insert is appropriate for use in metalworking, mechanical assembly, and maintenance repair operations where UNF thread standards are required. The self-lock wall design provides resistance to loosening under vibration or dynamic loading without requiring adhesive thread-locking compounds. It is suited for both light industrial and field repair scenarios where a standard tap is used for installation preparation. The 2B internal and 2A external class of fit ratings indicate general-purpose tolerances consistent with standard UNF fastener practice.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3\/4-16 UNF internal thread with 2B class of fit for standard fastener compatibility\u003c\/li\u003e\n  \u003cli\u003e1-8 external thread with 2A class of fit for installation into a standard tapped parent hole\u003c\/li\u003e\n  \u003cli\u003eSelf-lock wall design resists loosening under vibration without adhesive compounds\u003c\/li\u003e\n  \u003cli\u003eC12L14 carbon steel construction provides consistent machinability and thread integrity\u003c\/li\u003e\n  \u003cli\u003eSmooth, rolled finish on external thread promotes clean installation\u003c\/li\u003e\n  \u003cli\u003eOverall length of 25\/32 inches (0.781 inches) suits compact joint configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style thread repair and conversion insert for applications requiring a UNF 3\/4-16 internal thread installed through a standard-tapped 1-8 parent hole in carbon steel or compatible base materials.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a qualified machinist or mechanical technician using a standard tap sized for the 1-8 external thread prior to driving the insert. The parent material assembly should be fully de-energized and secured before thread repair work begins. Do not exceed the engagement depth supported by the insert length, and avoid cross-threading during installation. Follow applicable fastener and mechanical assembly standards for the specific application environment.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Thread Size\u003c\/strong\u003e: 3\/4-16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Thread Size\u003c\/strong\u003e: 1-8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Length\u003c\/strong\u003e: 25\/32 inches (0.781 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: C12L14\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Thread Class of Fit\u003c\/strong\u003e: 2B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Thread Class of Fit\u003c\/strong\u003e: 2A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Type\u003c\/strong\u003e: Self-Lock Wall\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFor Tap Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating \/ Finish\u003c\/strong\u003e: Smooth, Rolled\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0503 pounds\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: E-Z LOK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 329-1216\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"E-Z LOK","offers":[{"title":"Default Title","offer_id":67907398238514,"sku":"329-1216","price":37.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4d0d242c07e46db26a9007b829ed3ab0_97488190-b509-41a0-8e90-270513ac1c1d.jpg?v=1791178994","url":"https:\/\/voomisupply.com\/products\/e-z-lok-329-1216-thread-locking-insert-3-4-16-unf","provider":"Voomi Supply","version":"1.0","type":"link"}