{"product_id":"robbjack-st-434-12-a-corner-chamfer-end-mill-3-8-in-4-flute","title":"Robbjack ST-434-12-A Corner Chamfer End Mill 3\/8 in 4 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ROBBJACK ST-434-12-A is a solid carbide corner chamfer end mill designed for precision edge preparation and chamfering on ferrous and exotic workpiece materials. This single-end tool features a 3\/8-inch cutting diameter, four helical flutes at a 30-degree helix angle, and a 45-degree chamfer angle, making it well-suited for both roughing and finishing passes. The AlTiN (aluminum titanium nitride) PVD coating provides elevated heat resistance and wear protection, extending tool life in demanding cutting environments. Licensed machinists and CNC programmers working in job shops, aerospace, and heavy manufacturing will find this tool appropriate for side milling and edge chamfer applications.\u003c\/p\u003e\n\u003cp\u003eThe ST-434-12-A is intended for use on steel, stainless steel, cast iron, superalloys, and titanium workpieces, corresponding to material codes P, M, K, and S. With a 7\/8-inch length of cut, 3\/8-inch straight cylindrical shank, and a 2.5-inch overall length, this tool fits standard ER and set-screw toolholders commonly used on vertical machining centers and CNC mills. It performs side milling operations and is suited for both production and prototype environments where consistent chamfer geometry is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e45-degree chamfer angle with 0.0050-inch chamfer length for controlled edge break geometry\u003c\/li\u003e\n  \u003cli\u003eAlTiN PVD coating for improved heat resistance and extended tool life on hard and abrasive materials\u003c\/li\u003e\n  \u003cli\u003eFour right-hand helical flutes at 30-degree helix angle for efficient chip evacuation\u003c\/li\u003e\n  \u003cli\u003eSolid carbide construction for rigidity and dimensional stability under high cutting loads\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank with tight diameter tolerance (-0.0001 to -0.0002 inches) for secure toolholder engagement\u003c\/li\u003e\n  \u003cli\u003eRated for roughing and finishing material removal on steel, stainless steel, cast iron, superalloys, and titanium\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use on steel, stainless steel, cast iron, superalloys, and titanium workpieces (material codes P, M, K, S). Fits standard 3\/8-inch ER collet chucks and set-screw end mill holders used on CNC vertical and horizontal machining centers.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and operation should be performed by a qualified CNC machinist or tooling technician. Ensure the machine spindle is fully stopped and the tool is securely seated in the toolholder before beginning any setup. Verify runout with a dial indicator after clamping, as chamfer end mills are sensitive to runout-induced geometry errors. Follow the machine tool manufacturer and cutting tool manufacturer recommendations for speeds, feeds, and depth of cut for the specific workpiece material.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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\u003eNumber of Flutes\u003c\/strong\u003e: 4\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\u003eOverall Length\u003c\/strong\u003e: 2.5000 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\u003eChamfer Angle\u003c\/strong\u003e: 45 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer Length\u003c\/strong\u003e: 0.0050 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 30 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Style\u003c\/strong\u003e: Medium\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Helical\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\u003eSingle or Double End\u003c\/strong\u003e: Single\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 Material\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: +0.0010 to -0.0000 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\u003eCentercutting\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\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\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\u003eExtended Reach\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePitch\u003c\/strong\u003e: Normal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: ST-434\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.125 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: ROBBJACK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ST-434-12-A\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":52111395717426,"sku":"ST-434-12-A","price":154.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0efd73872b142bbc486ddc4d19efac9b_5d8541af-b2b4-4be4-af12-449403e9b593.jpg?v=1790076927","url":"https:\/\/voomisupply.com\/products\/robbjack-st-434-12-a-corner-chamfer-end-mill-3-8-in-4-flute","provider":"Voomi Supply","version":"1.0","type":"link"}