{"product_id":"robbjack-st-343-12-a-corner-chamfer-end-mill-3-8-in-solid-carbide","title":"Robbjack ST-343-12-A Corner Chamfer End Mill 3\/8 in Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ROBBJACK ST-343-12-A is a single-end corner chamfer end mill ground from solid carbide and coated with AlTiN via a PVD process. It carries a 3\/8 inch cutting diameter, a 7\/8 inch length of cut, and a 45-degree chamfer angle with a chamfer width of 0.0050 to 0.0070 inches. Three right-hand helical flutes at a 40-degree helix angle promote efficient chip evacuation and support both roughing and finishing operations in a single tool. The centercutting geometry allows direct plunge entry. Licensed machinists and CNC operators running production or job-shop work on ferrous and hard materials will find this tool suited to demanding material removal applications.\u003c\/p\u003e\u003cp\u003eThe ST-343-12-A is intended for use on steel, stainless steel, cast iron, superalloys, and titanium  -  workpiece material codes P, M, K, and S. It supports slotting, side milling, helical interpolation, and ramping operations. The 3\/8 inch straight-cylindrical shank fits standard ER collet chucks, end mill holders, and shrink-fit toolholders on CNC machining centers and manual mills. The regular-length flute geometry and 2.5 inch overall length make it practical for close-tolerance work where reach is limited.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide substrate for rigidity and heat resistance in hard-material cutting\u003c\/li\u003e\n\u003cli\u003eAlTiN PVD coating extends tool life on steel, stainless steel, cast iron, superalloys, and titanium\u003c\/li\u003e\n\u003cli\u003e45-degree chamfer angle at 0.0050 to 0.0070 inches chamfer width for consistent edge-break geometry\u003c\/li\u003e\n\u003cli\u003e40-degree high-helix, right-hand flute direction promotes chip flow and reduces cutting forces\u003c\/li\u003e\n\u003cli\u003eCentercutting design enables direct plunge entry without a pilot hole\u003c\/li\u003e\n\u003cli\u003eSupports slotting, side milling, helical interpolation, and ramping in a single tool\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003ePart of the ROBBJACK ST-343 series; designed for use on CNC machining centers and manual mills with standard 3\/8 inch straight-bore toolholders. Primary workpiece materials are steel, stainless steel, cast iron, superalloys, and titanium.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eA licensed machinist or CNC operator should install this end mill. Ensure the machine spindle is fully stopped and locked out before loading or changing tooling. Seat the shank fully in the collet or holder and torque the retention nut to the toolholder manufacturer specification. Verify runout at the cutting edge before beginning a cut, as excessive runout accelerates wear on carbide tooling.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 3\/8 inches (0.3750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3\/8 inches (0.3750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 7\/8 inches (0.8750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Angle\u003c\/strong\u003e: 45 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChamfer Width\u003c\/strong\u003e: 0.0050 to 0.0070 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 40 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Style\u003c\/strong\u003e: High\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: AlTiN (PVD)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Helix\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Index\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Removal Type\u003c\/strong\u003e: Roughing and Finishing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Superalloys and Titanium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.0000 to -0.0030 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: -0.0001 to -0.0002 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length Tolerance\u003c\/strong\u003e: -0.0600 to +0.0600 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.125 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: ROBBJACK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ST-343-12-A\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":51964652290354,"sku":"ST-343-12-A","price":155.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/01edf633bbb6ca5d0c663861e2971bef_704113d9-4e0b-4433-94e5-9a46e03de9d2.jpg?v=1789949236","url":"https:\/\/voomisupply.com\/products\/robbjack-st-343-12-a-corner-chamfer-end-mill-3-8-in-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}