{"product_id":"sumitomo-191r282-carbide-turning-insert-cnmg643-ac420k","title":"Sumitomo 191R282 Carbide Turning Insert CNMG643 AC420K","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SUMITOMO 191R282 is a CNMG-style carbide turning insert designed for precision metal cutting on CNC lathes and turning centers. Manufactured to ANSI and ISO 13399 standards, it carries the AC420K grade designation with a CVD-applied proprietary FF coating. The insert features an 80-degree diamond (rhombic) shape, a 3\/4 inch inscribed circle, and a 3\/64 inch corner radius. A neutral hand orientation and negative side clearance geometry make it suitable for both light and medium machining passes. Machinists and CNC operators working with cast iron and hardened materials will find the AC420K grade balances moderate wear resistance with adequate toughness across a range of cutting conditions.\u003c\/p\u003e\u003cp\u003eThis insert is intended for use in ferrous machining applications, primarily targeting cast iron (ISO material group K) and hardened materials (ISO material group H). The ENZ chip breaker geometry supports chip control across light to medium material removal rates, making it a practical choice for finishing and semi-finishing operations in production turning environments. Typical installations include CNC horizontal and vertical turning centers in job shops, production facilities, and maintenance machining operations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAC420K grade with CVD-applied FF coating for wear resistance in cast iron and hardened material applications\u003c\/li\u003e\n\u003cli\u003eENZ chip breaker geometry supports light and medium machining operations\u003c\/li\u003e\n\u003cli\u003e80-degree diamond insert shape (CNMG style) with negative side clearance for rigid, stable cutting\u003c\/li\u003e\n\u003cli\u003ePositive rake angle of 4 degrees reduces cutting forces\u003c\/li\u003e\n\u003cli\u003eCompatible with clamp and pin insert holding methods\u003c\/li\u003e\n\u003cli\u003eConforms to ANSI and ISO 13399 standards for insert geometry and tolerancing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eThe 191R282 uses ANSI insert code CNMG643 and ISO insert code CNMG190612N-UZ, fitting toolholders designed for CNMG-style inserts with a 0.3126 inch hole diameter, clamp or pin retention, and M-tolerance seating. Verify toolholder pocket specifications before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis insert is installed by qualified machinists or CNC tooling technicians following standard turning insert change procedures. Power down and lock out the machine spindle before accessing the turret or toolholder. Use the appropriate torque wrench and manufacturer-specified clamping hardware for the toolholder; do not substitute fasteners. Inspect the insert pocket and seating surface for chips or debris before seating the new insert to ensure proper contact and prevent premature edge failure.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eANSI Insert Code\u003c\/strong\u003e: CNMG643\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Insert Code\u003c\/strong\u003e: CNMG190612N-UZ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: C - Diamond (Rhombic) 80 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 3\/4 inch (0.7500 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 3\/64 inch (0.0469 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 1\/4 inch (0.2500 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length\u003c\/strong\u003e: 0.7598 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.3126 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 0 degrees (Negative Side Clearance)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRake Angle\u003c\/strong\u003e: 4 degrees (Positive)\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: AC420K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: CVD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Designation\u003c\/strong\u003e: FF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip Breaker\u003c\/strong\u003e: ENZ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron (K), Hardened Materials (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip Breaker Operation\u003c\/strong\u003e: Light Machining, Medium Machining\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Clamp, Pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.064 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, ISO 13399\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SUMITOMO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 191R282\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51727095103794,"sku":"191R282","price":48.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/57bb6502130075b3116f3e14787f57d3.jpg?v=1788673229","url":"https:\/\/voomisupply.com\/products\/sumitomo-191r282-carbide-turning-insert-cnmg643-ac420k","provider":"Voomi Supply","version":"1.0","type":"link"}