{"product_id":"sumitomo-186palw-grooving-insert-gcmn4008mg-ac425k-gnd-series","title":"Sumitomo 186PALW Grooving Insert GCMN4008MG AC425K Gnd Series","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SUMITOMO 186PALW is a solid carbide grooving insert engineered for precision external and internal grooving operations on CNC turning centers and lathes. Built to GCMN4008MG geometry with an AC425K CVD coating, it delivers a 4 mm cutting width and a maximum depth of cut of 25.4 mm (1 inch). The double-ended design extends tool life and reduces cost per edge. A positive rake angle of 5 degrees and MG chip breaker geometry work together to control chip evacuation in demanding cuts. This insert is installed and changed by machinists and CNC operators in production and job-shop environments.\u003c\/p\u003e\n\u003cp\u003eThe 186PALW is suited for grooving and parting applications where cast iron and similar K-category workpiece materials are the primary target. Its GND series designation places it in a family optimized for stable, repeatable grooving on both light-duty finishing passes and moderate stock-removal operations. The neutral hand orientation allows it to seat in compatible left- or right-hand toolholders using a size 4008 insert seat. The MG chip breaker geometry helps manage chip formation across a range of feed rates common in ferrous grooving work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCVD-coated AC425K carbide grade optimized for cast iron (K-category) workpiece materials\u003c\/li\u003e\n  \u003cli\u003e4 mm cutting width with a 0.80 mm corner radius for consistent groove profile\u003c\/li\u003e\n  \u003cli\u003eMaximum depth of cut of 25.4 mm, covering a wide range of groove depths in a single insert\u003c\/li\u003e\n  \u003cli\u003eDouble-ended insert provides two usable cutting edges per insert\u003c\/li\u003e\n  \u003cli\u003ePositive 5-degree rake angle and MG chip breaker for controlled chip flow\u003c\/li\u003e\n  \u003cli\u003eCompliant with ANSI and ISO 13399 standards for tooling data interchange\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in GND series toolholders accepting a size 4008 insert seat with GCMN-style insert geometry. Confirm holder seat size and clamping system compatibility before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInsert changes should be performed with the machine in a full stop and all axes locked per shop lockout\/tagout procedures. Use the appropriate torx or hex key specified by the toolholder manufacturer when seating the clamping screw — do not overtighten. Inspect the insert pocket and seating surface for chips or debris before loading a new edge. Verify runout and tool offset after each insert index before returning the machine to cycle.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: GCMN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: AC425K\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: GND\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Width\u003c\/strong\u003e: 4.00 mm (0.1575 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 25.40 mm (1.0000 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.80 mm (0.0315 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Height\u003c\/strong\u003e: 3.99 mm (0.1570 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.0390 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Width\u003c\/strong\u003e: 4.00 mm (0.1575 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 26.39 mm (1.0390 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRake\u003c\/strong\u003e: Positive\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRake Angle\u003c\/strong\u003e: 5.00 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip Breaker\u003c\/strong\u003e: MG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Seat Size\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: CVD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Coated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron (K)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Double\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull Radius\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLead Angle\u003c\/strong\u003e: 0 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eANSI Code\u003c\/strong\u003e: GCMN4008-MG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: ISO 13399\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Weight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 5\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: SUMITOMO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 186PALW\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51750726074674,"sku":"186PALW","price":189.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c24c3c5632ee3e1cab4db86f2347c8c2.jpg?v=1788919034","url":"https:\/\/voomisupply.com\/products\/sumitomo-186palw-grooving-insert-gcmn4008mg-ac425k-gnd-series","provider":"Voomi Supply","version":"1.0","type":"link"}