{"product_id":"carmex-20403678-threading-insert-28-tpi-un-carbide","title":"Carmex 20403678 Threading Insert 28 Tpi Un Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CARMEX 20403678 is a laydown carbide threading insert designed for external UN thread forms at 28 threads per inch. It carries the BLU manufacturer grade with a PVD coating applied for extended tool life in demanding cutting conditions. The insert follows the 16ER series style with a 60-degree included angle and right-hand cutting orientation. Licensed machinists and CNC lathe operators install this insert into compatible 16ER toolholders for precision thread-turning operations. The inscribed circle measures 3\/8 inches and the cutting edge to theoretical edge length is 0.0200 inches, confirming its suitability for fine-pitch external threading applications.\u003c\/p\u003e\n\u003cp\u003eThis insert is suited for threading operations on stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces. It performs in both production and job-shop environments where consistent 28 TPI UN external threads are required. The ISO designation is 16 ER 28 UN. Typical applications include CNC lathes and manual threading operations where controlled chip formation and thread accuracy are critical. The single cutting tooth per side geometry supports clean thread profiles on a range of workpiece materials.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e16ER series laydown insert style for external threading\u003c\/li\u003e\n  \u003cli\u003e28 threads per inch UN thread standard with 60-degree included angle\u003c\/li\u003e\n  \u003cli\u003eCarbide substrate with PVD coating for extended wear resistance\u003c\/li\u003e\n  \u003cli\u003eBLU manufacturer grade optimized for stainless steel, superalloys, and titanium\u003c\/li\u003e\n  \u003cli\u003eRight-hand cutting orientation, single tooth per side geometry\u003c\/li\u003e\n  \u003cli\u003eInscribed circle of 3\/8 inches; face of insert to tip centerline 0.0300 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement threading insert for 16ER-style toolholders used in CNC and manual lathe threading of external UN thread forms.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or CNC setup technicians. Ensure the lathe is fully stopped and locked out before changing inserts. Seat the insert firmly and squarely in the toolholder pocket and tighten the clamping screw to the toolholder manufacturer's specified torque. Verify thread pitch and profile with a thread gauge before returning the machine to full production.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: 16ER\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: BLU\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: PVD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThreads Per Inch\u003c\/strong\u003e: 28\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: External\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 60 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Edge to Theoretical Edge Length\u003c\/strong\u003e: 0.0200 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFace of Insert to Tip Centerline\u003c\/strong\u003e: 0.0300 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Teeth Per Side\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: 16 ER 28 UN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Stainless Steel, Cast Iron, Non-Ferrous Metal, Superalloys and Titanium\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23291804\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: CARMEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 20403678\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CARMEX","offers":[{"title":"Default Title","offer_id":52104736604466,"sku":"20403678","price":37.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8290bc0476cca603e3bcb77085acd12c.jpg?v=1790072206","url":"https:\/\/voomisupply.com\/products\/carmex-20403678-threading-insert-28-tpi-un-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}