{"product_id":"e-z-lok-303-6-thread-locking-insert-3-8-16-unc-stainless","title":"E-z Lok 303-6 Thread Locking Insert 3\/8-16 Unc Stainless","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe E-Z LOK 303-6 is a self-locking threaded insert machined from 303-grade stainless steel, designed to create a secure internal thread in pre-tapped parent material. It carries a 3\/8-16 internal thread and a 9\/16-12 external thread, both to UNC standard, and measures 33\/64 inches (0.515 inches) in overall length. The self-lock wall design resists loosening under vibration and dynamic loads without the need for adhesives. Installation requires a standard tap matching the external thread specification. Maintenance technicians, millwrights, and mechanical contractors use these inserts to restore or reinforce threaded connections in metal assemblies.\u003c\/p\u003e\u003cp\u003eThis insert is suited for applications where a strong, corrosion-resistant internal thread is required in steel, aluminum, or cast components. The 303 stainless steel construction makes it appropriate for environments with moderate moisture or chemical exposure. Typical use cases include equipment repair, fixture fabrication, and thread repair in structural assemblies where the parent material thread has been stripped or requires an upgrade to a finer or coarser pitch.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e3\/8-16 internal thread (Class 2B fit) for standard UNC fastener engagement\u003c\/li\u003e\n\u003cli\u003e9\/16-12 external thread (Class 2A fit) installs with a standard tap  -  no special tooling required\u003c\/li\u003e\n\u003cli\u003eSelf-lock wall design resists loosening under vibration without adhesives\u003c\/li\u003e\n\u003cli\u003e303-grade stainless steel construction offers corrosion resistance and durability\u003c\/li\u003e\n\u003cli\u003eBright finish, uncoated surface maintains dimensional accuracy\u003c\/li\u003e\n\u003cli\u003eTensile strength rated at 12,651 pounds for high-load applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for installation in parent material pre-tapped to accept a 9\/16-12 UNC external thread, using a standard tap. Suitable for use in steel, aluminum, and similar machinable substrates requiring a 3\/8-16 UNC internal thread.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by a machinist, millwright, or mechanical technician using a standard 9\/16-12 UNC tap to prepare the parent material bore. De-energize and lock out any equipment before performing thread repair or insert installation on machinery. Drive the insert to the specified depth using an appropriate insert installation tool to avoid cross-threading or over-driving. Verify thread engagement with a 3\/8-16 UNC go\/no-go gauge after installation where tolerance is critical.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Thread Size\u003c\/strong\u003e: 3\/8-16 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Thread Size\u003c\/strong\u003e: 9\/16-12 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\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: 33\/64 inches (0.515 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\u003eFinish\u003c\/strong\u003e: Bright\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTensile Strength\u003c\/strong\u003e: 12,651 pounds\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: 0.0138 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 303-6\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"E-Z LOK","offers":[{"title":"Default Title","offer_id":67916298092850,"sku":"303-6","price":39.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8d9fa78af6c90a875d3242c596aed27d_f12b299c-8065-4df1-b757-510f6ad3519a.jpg?v=1791257380","url":"https:\/\/voomisupply.com\/products\/e-z-lok-303-6-thread-locking-insert-3-8-16-unc-stainless","provider":"Voomi Supply","version":"1.0","type":"link"}