{"product_id":"walter-prototyp-7255020-square-end-mill-0-375-in-4-flute-carbide","title":"Walter-prototyp 7255020 Square End Mill 0.375 in 4 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WALTER-PROTOTYP 7255020 is a solid carbide square end mill engineered for demanding material removal in hard materials and steel. Part of the MC388 series, it features a 50-degree helix angle and a TiAlSiN coating that provides heat and wear resistance at elevated cutting speeds. The 4-flute, right-hand spiral configuration delivers efficient chip evacuation and a stable cutting action. With a 0.375-inch mill diameter, a 0.375-inch straight cylindrical shank, and a 3-inch overall length, this tool is center-cutting and suited for both plunge and peripheral milling operations. It is installed and used by machinists and CNC tooling professionals in precision machining environments.\u003c\/p\u003e\n\u003cp\u003eThe 7255020 is designed for use on hard materials (material group H) as its primary workpiece classification and steel (material group P) as its secondary classification. This makes it appropriate for die and mold work, hardened steel components, and other applications where tool longevity under thermal stress is critical. The reach length of 0.875 inches and regular length type suit standard cavity and profile milling setups on vertical machining centers and CNC mills.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for rigidity and wear resistance in hard workpiece materials\u003c\/li\u003e\n  \u003cli\u003eTiAlSiN coating enhances thermal stability and extends tool life at high cutting speeds\u003c\/li\u003e\n  \u003cli\u003e50-degree helix angle promotes smooth cutting action and efficient chip evacuation\u003c\/li\u003e\n  \u003cli\u003e4-flute, right-hand cut and right-hand flute spiral geometry for stable peripheral and slot milling\u003c\/li\u003e\n  \u003cli\u003eCenter-cutting design allows direct plunge entry into the workpiece\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank with h6 tolerance ensures consistent tool holding in standard collet and end mill holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style solid carbide end mill in the MC388 series, compatible with standard 3\/8-inch end mill holders, collets, and shrink-fit toolholders accepting a straight cylindrical shank with h6 tolerance.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is in a safe state before changing tooling. Seat the shank fully into the holder to the recommended gauge line and torque the retention hardware per the toolholder manufacturer specifications. Verify runout with a dial indicator before engaging the workpiece, as excessive runout reduces tool life and surface finish quality on hard materials.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 0.375 inches (3\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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\/Finish\u003c\/strong\u003e: TiAlSiN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.375 inches (3\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReach Length\u003c\/strong\u003e: 0.875 inches (22.23 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 22 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 50 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\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\u003eSecondary Workpiece Material\u003c\/strong\u003e: Steel (P)\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\u003eSeries\u003c\/strong\u003e: MC388\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Weight\u003c\/strong\u003e: 0.176 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 3.5 inches x 0.71 inches x 0.71 inches\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: 7255020\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WALTER","offers":[{"title":"Default Title","offer_id":67911635075378,"sku":"7255020","price":242.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/04ecdf2fc26f6817fe1acd349867dcfb_b5383055-50c9-4ec2-a70d-7028b8b51551.jpg?v=1791214965","url":"https:\/\/voomisupply.com\/products\/walter-prototyp-7255020-square-end-mill-0-375-in-4-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}