{"product_id":"walter-prototyp-7254525-corner-radius-end-mill-4mm","title":"Walter-prototyp 7254525 Corner Radius End Mill 4mm","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WALTER-PROTOTYP 7254525 is a solid carbide corner radius end mill engineered for high-performance cutting in hard materials. Built on the MC187 series platform, it features a 4 mm cutting diameter with a 0.5 mm corner radius and four right-hand helical flutes at a 50-degree helix angle. The tool carries a TiAlSiN PVD coating, which provides thermal resistance and extended tool life during aggressive cuts in hardened steels and other hard workpiece materials. At 57 mm overall length with an 11 mm length of cut and a 6 mm straight-cylindrical shank, it fits standard toolholders used in precision CNC milling operations. Installation is performed by qualified machinists and tooling technicians.\u003c\/p\u003e\n\u003cp\u003eThis end mill is designed for both roughing and finishing operations in hard materials, designated under the H material grade classification. The extended reach geometry, with a 21 mm reach length, makes it suitable for applications requiring access to deeper features or stepped profiles. The single-end, non-centercutting design means it is optimized for side milling, profiling, and contouring passes rather than plunge cuts. It is well suited for CNC machining centers running tight-tolerance work in die and mold, aerospace, and general precision metalworking environments where hard material grades are standard.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4 mm cutting diameter with 0.5 mm corner radius for controlled edge blending on hard materials\u003c\/li\u003e\n  \u003cli\u003eTiAlSiN PVD coating provides thermal and wear resistance during high-speed milling\u003c\/li\u003e\n  \u003cli\u003e50-degree high helix angle promotes efficient chip evacuation and smooth surface finish\u003c\/li\u003e\n  \u003cli\u003eFine grain solid carbide substrate supports edge integrity in hard material applications\u003c\/li\u003e\n  \u003cli\u003eExtended reach of 21 mm allows access to deeper features without tool interference\u003c\/li\u003e\n  \u003cli\u003e6 mm straight-cylindrical shank with h6 tolerance for precise toolholder fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with standard CNC toolholders accepting a 6 mm straight-cylindrical shank. Intended for machining hard materials (material code H) in precision milling applications. Part of the Walter Prototyp MC187 series.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist or tooling technician following the machine tool manufacturer guidelines. Ensure the spindle is fully stopped and locked out before changing tooling. Seat the shank fully in the toolholder and torque the retention system to the toolholder manufacturer specification. Confirm runout at the cutting diameter before beginning a production cycle, as runout beyond acceptable limits will accelerate edge wear on small-diameter carbide tooling.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 4 mm (0.1575 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.5 mm\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: 11 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 57 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReach Length\u003c\/strong\u003e: 21 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 6 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 50 degrees\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\u003eMaterial Grade\u003c\/strong\u003e: Fine Grain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlSiN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Classification\u003c\/strong\u003e: PVD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Hard Material (H)\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\u003eEnd Type\u003c\/strong\u003e: Corner Radius\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Single\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\u003eMill Diameter Tolerance\u003c\/strong\u003e: h10\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: h6\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: MC187\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 2.56 x 0.47 x 0.47 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 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: WALTER-PROTOTYP\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 7254525\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WALTER","offers":[{"title":"Default Title","offer_id":67907862626610,"sku":"7254525","price":150.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3bbbd7bf1affddca8b1cc8591ad07f3b.jpg?v=1791181662","url":"https:\/\/voomisupply.com\/products\/walter-prototyp-7254525-corner-radius-end-mill-4mm","provider":"Voomi Supply","version":"1.0","type":"link"}