{"product_id":"e-z-lok-303-428-thread-locking-insert-1-4-28-unf-stainless","title":"E-z Lok 303-428 Thread Locking Insert 1\/4-28 Unf Stainless","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe E-Z LOK 303-428 is a self-locking threaded insert manufactured from 303-grade stainless steel with a bright finish. It accepts a 1\/4-28 UNF internal thread (Class 2B fit) and installs via a 7\/16-14 external thread (Class 2A fit) driven into a standard tapped hole. Overall length is 7\/16 inches (0.437 inches). The self-lock wall design provides a secure, vibration-resistant thread engagement in parent materials where thread stripping or pullout is a concern. Machinists, maintenance technicians, and assembly professionals install this type of insert to restore or reinforce threads in metal components.\u003c\/p\u003e\n\u003cp\u003eThis insert is suited for applications requiring a corrosion-resistant internal thread in assemblies exposed to moisture, mild chemicals, or outdoor environments. The 1\/4-28 UNF thread specification makes it appropriate for fine-thread fastener applications in precision mechanical, industrial, and maintenance repair scenarios. It installs into a standard tapped hole sized for the 7\/16-14 external thread, requiring no special installation tool beyond standard tap tooling.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSelf-lock wall design resists loosening under vibration and dynamic loads\u003c\/li\u003e\n  \u003cli\u003e303 stainless steel construction provides corrosion resistance in wet or chemical environments\u003c\/li\u003e\n  \u003cli\u003e1\/4-28 UNF internal thread (Class 2B) for fine-thread fastener compatibility\u003c\/li\u003e\n  \u003cli\u003e7\/16-14 external thread (Class 2A) installs into a standard tapped hole\u003c\/li\u003e\n  \u003cli\u003eCompact 7\/16-inch overall length suits thin-wall and space-constrained assemblies\u003c\/li\u003e\n  \u003cli\u003eBright finish with no additional coating that could affect thread tolerances\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style thread repair and reinforcement insert for metal parent materials tapped to accept a 7\/16-14 external thread with a standard tap, yielding a 1\/4-28 UNF internal fastener thread.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or mechanical technicians using standard hand or machine tapping equipment. The parent material must be drilled and tapped to the correct 7\/16-14 minor diameter before insert installation. De-energize and lock out any equipment before servicing threaded connections in powered assemblies. Do not exceed the torque capacity of the 1\/4-28 internal thread during final fastener installation, and verify thread engagement depth meets the requirements of the application.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Thread Size\u003c\/strong\u003e: 1\/4-28\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Thread Size\u003c\/strong\u003e: 7\/16-14\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNF\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 Length\u003c\/strong\u003e: 7\/16 inches (0.437 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Type\u003c\/strong\u003e: Self-Lock Wall\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 303\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFor Tap Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0086 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: 303-428\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"E-Z LOK","offers":[{"title":"Default Title","offer_id":67911085392178,"sku":"303-428","price":34.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/be6a35398c8d317bda3b0e1be3287514.jpg?v=1791204152","url":"https:\/\/voomisupply.com\/products\/e-z-lok-303-428-thread-locking-insert-1-4-28-unf-stainless","provider":"Voomi Supply","version":"1.0","type":"link"}