{"id":18841,"date":"2026-07-02T09:18:27","date_gmt":"2026-07-02T09:18:27","guid":{"rendered":"https:\/\/onmytoolings.com\/?page_id=18841"},"modified":"2026-10-23T02:14:45","modified_gmt":"2026-10-23T02:14:45","slug":"end-mills-for-hardened-steel","status":"publish","type":"page","link":"https:\/\/onmytoolings.com\/ru\/applications\/end-mills-for-hardened-steel\/","title":{"rendered":"\u0424\u0440\u0435\u0437\u044b \u0434\u043b\u044f \u0437\u0430\u043a\u0430\u043b\u0435\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u043b\u0438"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"18841\" class=\"elementor elementor-18841\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3a8d0dd e-con-full e-flex e-con e-parent\" data-id=\"3a8d0dd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c132f41 elementor-widget elementor-widget-html\" data-id=\"c132f41\" 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target=\"_blank\">Applications<\/a><span aria-hidden=\"true\"> \/ <\/span><span aria-current=\"page\">End Mills for Hardened Steel<\/span><\/nav><\/div>\r\n <header class=\"hs10-hero\"><div class=\"hs10-container hs10-hero-grid\">\r\n  <div><div class=\"hs10-eyebrow\">HARD MILLING \u00b7 MOLD &amp; TOOL STEEL<\/div><h1>Carbide End Mills for Hardened &amp; High-Hardness Steel<\/h1>\r\n  <p>Select solid carbide end mills for hardened tool steel, mold components and high-HRC machining. Compare HMH and HMX high-hardness series, the HMM general-purpose option and three cutting geometries: square, corner radius and ball nose.<\/p>\r\n  <div class=\"hs10-pills\"><span>HMH \u00b7 HMX \u00b7 HMM<\/span><span>4E \/ 4R \/ 2B<\/span><span>HRC60 &amp; HRC65 Application Review<\/span><\/div>\r\n  <div class=\"hs10-actions\"><a class=\"hs10-button\" href=\"#hs10-families\">Explore 9 Tool Families \u2192<\/a><a class=\"hs10-button hs10-button-outline\" href=\"#hs10-quote\">Request a Quote<\/a><\/div><\/div>\r\n  <aside class=\"hs10-hero-card\" aria-label=\"Hardened steel end mills product image\"><div class=\"hs10-small-eyebrow\">HARDENED STEEL END MILL SERIES<\/div>\r\n  <img class=\"hs10-image-real hs10-hero-image-real\" src=\"https:\/\/onmytoolings.com\/wp-content\/uploads\/2026\/10\/Carbide-End-Mills-for-Hardened-High-Hardness-Steel.webp\" alt=\"Solid carbide end mills for hardened and high-hardness steel machining\" loading=\"eager\" decoding=\"async\" fetchpriority=\"high\" \/>\r\n  <div class=\"hs10-hero-card-foot\"><span>HMH \u00b7 High Hardness<\/span><span>HMX \u00b7 Super-High Hardness<\/span><\/div><\/aside>\r\n <\/div><\/header>\r\n\r\n <section class=\"hs10-section hs10-tint\" id=\"hs10-hardness\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">START WITH ACTUAL MATERIAL HARDNESS<\/div><h2>Choose End Mills by Steel Hardness<\/h2><p>Measured hardness is one input, not the whole tool specification. Use the ranges below as an initial enquiry path before selecting a catalog family and exact cutting geometry.<\/p><\/div>\r\n <div class=\"hs10-hardened-table\"><table><thead><tr><th scope=\"col\">Measured hardness<\/th><th scope=\"col\">Initial family direction<\/th><th scope=\"col\">Selection context<\/th><th scope=\"col\">Confirm before choosing<\/th><\/tr><\/thead><tbody><tr><td><strong>Below HRC 40<\/strong><\/td><td><strong>HMM<\/strong><\/td><td>General-purpose option for the hardened-steel conditions you have specified for HMM.<\/td><td>Material grade, heat-treatment state, cutting shape and measured hardness.<\/td><\/tr><tr><td><strong>Approximately HRC 40\u201355<\/strong><\/td><td><strong>HMH \u2014 application review<\/strong><\/td><td>A possible high-hardness family starting point; not a published guaranteed HRC range.<\/td><td>Steel grade, tool diameter, operation, machine rigidity.<\/td><\/tr><tr><td><strong>Approximately HRC 55\u201360<\/strong><\/td><td><strong>HMH \/ HMX \u2014 technical review<\/strong><\/td><td>Compare tool family and geometry before choosing a specific SKU.<\/td><td>Measured hardness, coating data, engagement and holder runout.<\/td><\/tr><tr><td><strong>HRC 60\u201365<\/strong><\/td><td><strong>HMX \u2014 high-HRC evaluation<\/strong><\/td><td>For enquiries involving HRC60 or HRC65, request a tool recommendation rather than assuming catalog-wide approval.<\/td><td>Grade, hardness, radius, depth, machine and target finish.<\/td><\/tr><tr><td><strong>Above HRC 65<\/strong><\/td><td><strong>Application-specific feasibility review<\/strong><\/td><td>No blanket machining capability is claimed for any standard family.<\/td><td>Supply material specification, verified HRC, drawing and setup.<\/td><\/tr><\/tbody><\/table><\/div>\r\n <div class=\"hs10-hardness-note\"><strong>Important:<\/strong> Except for HMM below HRC 40 (the confirmed general-purpose range), these HRC brackets are enquiry guidance, not tested hardness limits or guaranteed capabilities for HMH or HMX. Actual tool suitability must be reviewed for the specific material, SKU and cutting conditions.<\/div>\r\n <\/div><\/section>\r\n\r\n <section class=\"hs10-section\" id=\"hs10-series\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">CATALOG TOOL SERIES<\/div><h2>Compare HMH, HMX &amp; HMM End Mill Series<\/h2><p>Each series contains square, corner-radius and ball-nose families. Choose by the workpiece hardness and machining requirement, then review the appropriate catalog model and dimensions.<\/p><\/div><div class=\"hs10-series-grid\"><article class=\"hs10-series-card hs10-core\"><span class=\"hs10-grade-pill\">High-hardness milling<\/span><h3>HMH<\/h3><div class=\"hs10-series-head\">High-Speed \/ High-Hardness<\/div><p>A catalog-listed family for high-speed and high-hardness milling. Match grade, hardness and operation to the specific tool.<\/p><div class=\"hs10-series-tags\"><span>HMH-4E<\/span><span>HMH-4R<\/span><span>HMH-2B<\/span><\/div><\/article><article class=\"hs10-series-card hs10-core\"><span class=\"hs10-grade-pill\">Super-high-hardness milling<\/span><h3>HMX<\/h3><div class=\"hs10-series-head\">Super-High-Hardness<\/div><p>A catalog-listed family for super-high-hardness material machining. Suitable tool selection requires a review of measured HRC and machining conditions.<\/p><div class=\"hs10-series-tags\"><span>HMX-4E<\/span><span>HMX-4R<\/span><span>HMX-2B<\/span><\/div><\/article><article class=\"hs10-series-card \"><span class=\"hs10-grade-pill\">Below HRC 40<\/span><h3>HMM<\/h3><div class=\"hs10-series-head\">General-Purpose Machining<\/div><p>For carbon steel, alloy steel, stainless steel, cast iron and hardened steel below HRC 40.<\/p><div class=\"hs10-series-tags\"><span>HMM-4E<\/span><span>HMM-4R<\/span><span>HMM-2B<\/span><\/div><\/article><\/div><\/div><\/section>\r\n\r\n <section class=\"hs10-section hs10-tint\" id=\"hs10-geometry\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">CUTTING GEOMETRY<\/div><h2>Choose Square, Corner Radius or Ball Nose<\/h2><p>For hardened materials, the required part feature determines the tool shape. Select the end geometry first, then confirm the series, cutting length and measured hardness.<\/p><\/div><div class=\"hs10-grid3\"><article class=\"hs10-geometry\"><div class=\"hs10-geometry-media\"><img class=\"hs10-image-real hs10-geometry-image-real\" src=\"https:\/\/onmytoolings.com\/wp-content\/uploads\/2026\/10\/4-Flute-Square-End-Mill.webp\" alt=\"Four-flute solid carbide square end mill with a flat cutting end\" loading=\"lazy\" decoding=\"async\" \/><\/div><div class=\"hs10-geometry-body\"><span class=\"hs10-geometry-kicker\">4E \u00b7 4-flute flat end<\/span><h3>Square End Mills<\/h3><p>Flat-bottom steps, shoulders and side milling. The cutting corner is square; check the required feature geometry.<\/p><a class=\"hs10-textlink\" href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/square-end-mill\/\" target=\"_blank\">View 4E Cutting Geometry \u2192<\/a><\/div><\/article><article class=\"hs10-geometry\"><div class=\"hs10-geometry-media\"><img class=\"hs10-image-real hs10-geometry-image-real\" src=\"https:\/\/onmytoolings.com\/wp-content\/uploads\/2026\/10\/4-Flute-Corner-Radius-End-Mill.webp\" alt=\"Four-flute solid carbide corner radius end mill with rounded cutting corners\" loading=\"lazy\" decoding=\"async\" \/><\/div><div class=\"hs10-geometry-body\"><span class=\"hs10-geometry-kicker\">4R \u00b7 4-flute corner radius<\/span><h3>Corner Radius End Mills<\/h3><p>Radiused cutting corners for profiling and semi-finishing where the part drawing permits an R corner.<\/p><a class=\"hs10-textlink\" href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/bull-nose-end-mill\/\" target=\"_blank\">View 4R Cutting Geometry \u2192<\/a><\/div><\/article><article class=\"hs10-geometry\"><div class=\"hs10-geometry-media\"><img class=\"hs10-image-real hs10-geometry-image-real\" src=\"https:\/\/onmytoolings.com\/wp-content\/uploads\/2026\/10\/2B-\u00b7-2-Flute-Ball-Nose-Endmill.webp\" alt=\"Two-flute solid carbide ball nose end mill with a rounded cutting tip\" loading=\"lazy\" decoding=\"async\" \/><\/div><div class=\"hs10-geometry-body\"><span class=\"hs10-geometry-kicker\">2B \u00b7 2-flute ball nose<\/span><h3>Ball Nose End Mills<\/h3><p>Round cutting tip for mold contours, cavity surfaces and 3D finishing operations.<\/p><a class=\"hs10-textlink\" href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/ball-nose-end-mill\/\" target=\"_blank\">View 2B Cutting Geometry \u2192<\/a><\/div><\/article><\/div><\/div><\/section>\r\n\r\n <section class=\"hs10-section\" id=\"hs10-families\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">AVAILABLE CATALOG FAMILIES<\/div><h2>Explore 9 Hardened Steel End Mill Families<\/h2><p>Browse nine catalog-listed 4E square, 4R corner-radius and 2B ball-nose families. Standard, long and extra-long variants appear inside the same family to keep the selection concise.<\/p><\/div>\r\n <div class=\"hs10-filters\" aria-label=\"Filter hardened steel end mill families by geometry\"><span class=\"hs10-filter-label\">Cutting geometry<\/span><button class=\"hs10-filter\" type=\"button\" data-shape=\"all\" aria-pressed=\"true\">All 9<\/button><button class=\"hs10-filter\" type=\"button\" data-shape=\"4E\" aria-pressed=\"false\">4E Square<\/button><button class=\"hs10-filter\" type=\"button\" data-shape=\"4R\" aria-pressed=\"false\">4R Corner Radius<\/button><button class=\"hs10-filter\" type=\"button\" data-shape=\"2B\" aria-pressed=\"false\">2B Ball Nose<\/button><\/div>\r\n <div class=\"hs10-family-filter-panel\"><label class=\"hs10-filter-label\" for=\"hs10-series-choice\">Filter by series:<\/label><select id=\"hs10-series-choice\" class=\"hs10-filter-select\"><option value=\"all\">All Series<\/option><option value=\"HMM\">HMM \u2014 General Purpose<\/option><option value=\"HMH\">HMH \u2014 High Hardness<\/option><option value=\"HMX\">HMX \u2014 Super High Hardness<\/option><\/select><span class=\"hs10-count\" id=\"hs10-results\" role=\"status\" aria-live=\"polite\">Showing 9 families<\/span><\/div>\r\n <div class=\"hs10-family-grid\"><article class=\"hs10-family\" data-family=\"HMH\" data-shape=\"4E\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMH SERIES<\/span><span class=\"hs10-shape-pill\">4E<\/span><\/div><h3>HMH-4E<\/h3><div class=\"hs10-family-position\">Square \u00b7 shoulders \/ flat features<\/div><p class=\"hs10-family-desc\">High-speed, high-hardness steel family.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 4E \/ 4EL \/ 4EX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMH\" data-shape=\"4R\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMH SERIES<\/span><span class=\"hs10-shape-pill\">4R<\/span><\/div><h3>HMH-4R<\/h3><div class=\"hs10-family-position\">Corner radius \u00b7 side walls \/ profiles<\/div><p class=\"hs10-family-desc\">High-speed, high-hardness steel family.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 4R \/ 4RL \/ 4RX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMH\" data-shape=\"2B\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMH SERIES<\/span><span class=\"hs10-shape-pill\">2B<\/span><\/div><h3>HMH-2B<\/h3><div class=\"hs10-family-position\">Ball nose \u00b7 3D contours \/ mold finish<\/div><p class=\"hs10-family-desc\">High-speed, high-hardness steel family.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 2B \/ 2BL \/ 2BX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMX\" data-shape=\"4E\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMX SERIES<\/span><span class=\"hs10-shape-pill\">4E<\/span><\/div><h3>HMX-4E<\/h3><div class=\"hs10-family-position\">Square \u00b7 shoulders \/ flat features<\/div><p class=\"hs10-family-desc\">Super-high-hardness steel family; discuss measured HRC.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 4E \/ 4EL \/ 4EX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMX\" data-shape=\"4R\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMX SERIES<\/span><span class=\"hs10-shape-pill\">4R<\/span><\/div><h3>HMX-4R<\/h3><div class=\"hs10-family-position\">Corner radius \u00b7 side walls \/ profiles<\/div><p class=\"hs10-family-desc\">Super-high-hardness steel family; discuss measured HRC.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 4R \/ 4RL \/ 4RX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMX\" data-shape=\"2B\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMX SERIES<\/span><span class=\"hs10-shape-pill\">2B<\/span><\/div><h3>HMX-2B<\/h3><div class=\"hs10-family-position\">Ball nose \u00b7 3D contours \/ mold finish<\/div><p class=\"hs10-family-desc\">Super-high-hardness steel family; discuss measured HRC.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 2B \/ 2BL \/ 2BX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMM\" data-shape=\"4E\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMM SERIES<\/span><span class=\"hs10-shape-pill\">4E<\/span><\/div><h3>HMM-4E<\/h3><div class=\"hs10-family-position\">Square \u00b7 shoulders \/ flat features<\/div><p class=\"hs10-family-desc\">General-purpose; hardened steel below HRC 40.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 4E \/ 4EL \/ 4EX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMM\" data-shape=\"4R\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMM SERIES<\/span><span class=\"hs10-shape-pill\">4R<\/span><\/div><h3>HMM-4R<\/h3><div class=\"hs10-family-position\">Corner radius \u00b7 side walls \/ profiles<\/div><p class=\"hs10-family-desc\">General-purpose; hardened steel below HRC 40.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 4R \/ 4RL \/ 4RX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><article class=\"hs10-family\" data-family=\"HMM\" data-shape=\"2B\"><div class=\"hs10-family-top\"><span class=\"hs10-series-id\">HMM SERIES<\/span><span class=\"hs10-shape-pill\">2B<\/span><\/div><h3>HMM-2B<\/h3><div class=\"hs10-family-position\">Ball nose \u00b7 3D contours \/ mold finish<\/div><p class=\"hs10-family-desc\">General-purpose; hardened steel below HRC 40.<\/p><div class=\"hs10-family-variants\"><strong>Length variants:<\/strong> 2B \/ 2BL \/ 2BX<\/div><a class=\"hs10-textlink\" href=\"#hs10-quote\">Request model &amp; dimensions \u2192<\/a><\/article><\/div>\r\n <div class=\"hs10-family-info\">For a confirmed quotation, specify the <strong>workpiece grade, measured HRC, operation, D, d, H and L<\/strong>. Include R for 4R\/2B tools. The presence of a catalog family does not by itself confirm performance at a particular HRC value.<\/div><\/div><\/section>\r\n\r\n <section class=\"hs10-section hs10-tint\" id=\"hs10-high-hrc\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">HIGH-HRC HARD MILLING<\/div><h2>Carbide End Mills for HRC60 &amp; HRC65 Machining<\/h2><p>High-hardness mold steel, die inserts and hardened tool steel often require a more application-specific review. Use this section to prepare an HRC60 or HRC65 tool enquiry without assuming any series has a universal hardness rating.<\/p><\/div>\r\n <div class=\"hs10-hrc-grid\"><article class=\"hs10-hrc-card\"><div class=\"hs10-hrc-head\"><h3>HRC60 Hard Milling<\/h3><span>Tool evaluation<\/span><\/div><p>For a measured hardness around HRC60, evaluate high-hardness tool geometry, coating requirements, tool engagement and setup rigidity.<\/p><div class=\"hs10-code-row\"><span>HMH Review<\/span><span>HMX Review<\/span><span>4E \/ 4R \/ 2B<\/span><\/div><\/article>\r\n <article class=\"hs10-hrc-card\"><div class=\"hs10-hrc-head\"><h3>HRC65 Hard Milling<\/h3><span>Application review<\/span><\/div><p>HRC65 enquiries need explicit confirmation of steel grade and heat treatment, cutting depth, runout, holder quality and achievable tool access.<\/p><div class=\"hs10-code-row\"><span>HMX Direction<\/span><span>Measured HRC Required<\/span><span>Technical Review<\/span><\/div><\/article><\/div>\r\n <div class=\"hs10-hrc-features\"><div class=\"hs10-hrc-feature\"><strong>Cutting-Edge Geometry<\/strong><p>Choose 4E for necessary flat features, 4R where a radius is permitted, or 2B for contoured mold surfaces.<\/p><\/div><div class=\"hs10-hrc-feature\"><strong>Reach &amp; Holder Rigidity<\/strong><p>Keep tool overhang as short as the part allows; confirm long\/extra-long size rather than assuming it is safe at any hardness.<\/p><\/div><div class=\"hs10-hrc-feature\"><strong>Process Details<\/strong><p>Supply the steel grade, hardness, machining stage, finish target, coolant method and approximate engagement.<\/p><\/div><\/div>\r\n <p class=\"hs10-hardness-note\">HRC60 and HRC65 are machining-requirement terms here. No catalog-wide HMH\/HMX HRC60 or HRC65 cutting capability is asserted without model-specific technical evidence.<\/p>\r\n <\/div><\/section>\r\n\r\n <section class=\"hs10-section\" id=\"hs10-operations\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">WORKPIECE &amp; OPERATION<\/div><h2>Select Hard Milling Tools by Part Feature<\/h2><p>Choose the tool shape around the final part feature and machining stage, then verify the actual mold or tool steel grade and measured hardness.<\/p><\/div><div class=\"hs10-operations\">\r\n <article class=\"hs10-operation\"><span class=\"hs10-op-choise\">4E \u00b7 Square<\/span><h3>Flat Pockets &amp; Shoulders<\/h3><p>For flat-bottom features and shoulder machining where a square cutting corner is required.<\/p><\/article>\r\n <article class=\"hs10-operation\"><span class=\"hs10-op-choise\">4R \u00b7 Corner Radius<\/span><h3>Side Walls &amp; Semi-Finishing<\/h3><p>A corner radius is an option when the component drawing allows an R transition and the cutting corner needs support.<\/p><\/article>\r\n <article class=\"hs10-operation\"><span class=\"hs10-op-choise\">2B \u00b7 Ball Nose<\/span><h3>Mold Cavities &amp; 3D Contours<\/h3><p>Use a ball nose geometry for freeform profiles and mold surface finishing; confirm radius, stepover and reach.<\/p><\/article><\/div>\r\n <div class=\"hs10-family-info\"><strong>Common enquiries:<\/strong> P20\/718 mold steel, H13 tool steel, D2\/SKD11 die steel and other hardened grades. These names alone do not determine hardness: include the actual heat-treatment condition or measured HRC with your request.<\/div>\r\n <\/div><\/section>\r\n\r\n <section class=\"hs10-section hs10-tint\" id=\"hs10-dimensions\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">DIMENSIONS &amp; REACH<\/div><h2>Check End Mill Dimensions &amp; Length Options<\/h2><p>Switch between 4E, 4R and 2B drawings. Tool overhang and actual cutting length matter especially in hard milling and deep mold cavities.<\/p><\/div><div class=\"hs10-dimension-layout\"><div class=\"hs10-diagram-box\"><div class=\"hs10-diagram-tabs\" role=\"group\" aria-label=\"Choose technical drawing\"><button type=\"button\" class=\"hs10-diagram-tab\" data-drawing=\"4E\" aria-selected=\"true\">4E Square<\/button><button type=\"button\" class=\"hs10-diagram-tab\" data-drawing=\"4R\" aria-selected=\"false\">4R Corner Radius<\/button><button type=\"button\" class=\"hs10-diagram-tab\" data-drawing=\"2B\" aria-selected=\"false\">2B Ball Nose<\/button><\/div><div class=\"hs10-drawing-panel\" data-panel=\"4E\" ><img class=\"hs10-image-real hs10-technical-image-real\" src=\"https:\/\/onmytoolings.com\/wp-content\/uploads\/2026\/10\/4E-4-Flutes-Square-End-Mill-Dimension-Drawing.webp\" alt=\"Technical drawing of a four-flute square end mill showing cutting diameter D, shank diameter d, cutting length H and overall length L\" loading=\"lazy\" decoding=\"async\" \/><p class=\"hs10-diagram-caption\">D, d, H and L for a four-flute square-end tool. Refer to the corresponding catalog size table for actual values.<\/p><\/div><div class=\"hs10-drawing-panel\" data-panel=\"4R\" hidden><div class=\"hs10-placeholder \" role=\"img\" aria-label=\"Image placeholder: 4R Corner Radius Drawing\"><span class=\"hs10-image-icon\" aria-hidden=\"true\">\u25a7<\/span><strong>4R Corner Radius Drawing<\/strong><span>Technical dimension drawing<\/span><\/div><p class=\"hs10-diagram-caption\">D, d, R, H and L for a corner-radius tool. Refer to the corresponding catalog size table for actual values.<\/p><\/div><div class=\"hs10-drawing-panel\" data-panel=\"2B\" hidden><div class=\"hs10-placeholder \" role=\"img\" aria-label=\"Image placeholder: 2B Ball Nose Drawing\"><span class=\"hs10-image-icon\" aria-hidden=\"true\">\u25a7<\/span><strong>2B Ball Nose Drawing<\/strong><span>Technical dimension drawing<\/span><\/div><p class=\"hs10-diagram-caption\">D, d, R, H and L for a two-flute ball-nose tool. Refer to the corresponding catalog size table for actual values.<\/p><\/div><\/div>\r\n <div class=\"hs10-dimension-explain\"><h3>Read the Tool Drawing<\/h3><div class=\"hs10-dim-row\"><span class=\"hs10-symbol\">D<\/span><div><strong>Cutting Diameter<\/strong><span>Nominal cutting size of the tool.<\/span><\/div><\/div><div class=\"hs10-dim-row\"><span class=\"hs10-symbol\">d<\/span><div><strong>Shank Diameter<\/strong><span>Clamping diameter for the toolholder.<\/span><\/div><\/div><div class=\"hs10-dim-row\"><span class=\"hs10-symbol\">H<\/span><div><strong>Cutting \/ Flute Length<\/strong><span>Cutting edge length, not automatically the safe milling depth.<\/span><\/div><\/div><div class=\"hs10-dim-row\"><span class=\"hs10-symbol\">L<\/span><div><strong>Overall Length<\/strong><span>Total cutter length, not the usable reach by itself.<\/span><\/div><\/div><div class=\"hs10-dim-row\"><span class=\"hs10-symbol\">R<\/span><div><strong>Corner \/ Ball Radius<\/strong><span>Specified on 4R corner-radius or 2B ball-nose drawings.<\/span><\/div><\/div><div class=\"hs10-lengths\"><strong>Catalog length variants:<\/strong> 4E \/ 4EL \/ 4EX, 4R \/ 4RL \/ 4RX and 2B \/ 2BL \/ 2BX. Compare the actual dimensions in the catalog before selecting an extended length.<\/div><\/div><\/div>\r\n <\/div><\/section>\r\n\r\n <section class=\"hs10-section\" id=\"hs10-related\"><div class=\"hs10-container\"><div class=\"hs10-intro\"><div class=\"hs10-eyebrow\">RELATED PRODUCT CATEGORIES<\/div><h2>Explore Related Hard Milling Cutter Geometries<\/h2><p>For deeper geometry and flute-count comparisons, explore these dedicated carbide end mill categories.<\/p><\/div><div class=\"hs10-related\"><a href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/4-flute-end-mill\/\" target=\"_blank\"><strong>4 Flute End Mills<\/strong><span>Compare 4E square and 4R corner-radius structures<\/span><em>Explore \u2192<\/em><\/a><a href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/bull-nose-end-mill\/\" target=\"_blank\"><strong>Bull Nose End Mills<\/strong><span>Review corner-radius sizes and machining features<\/span><em>Explore \u2192<\/em><\/a><a href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/ball-nose-end-mill\/\" target=\"_blank\"><strong>Ball Nose End Mills<\/strong><span>Review 2B ball-nose tool shapes for 3D surfaces<\/span><em>Explore \u2192<\/em><\/a><a href=\"https:\/\/onmytoolings.com\/carbide-end-mill-supplier\/long-reach-end-mills\/\" target=\"_blank\"><strong>Long Reach End Mills<\/strong><span>Plan deep-cavity reach and tool stability<\/span><em>Explore \u2192<\/em><\/a><\/div><\/div><\/section>\r\n\r\n <section class=\"hs10-quote\" id=\"hs10-quote\"><div class=\"hs10-container hs10-quote-grid\"><div class=\"hs10-quote-copy\"><div class=\"hs10-eyebrow\">REQUEST A QUOTE<\/div><h2>Request Hardened Steel End Mill Pricing &amp; Specifications<\/h2><p>Send the actual hardness and machining requirements so a suitable catalog tool family can be reviewed for your job.<\/p><ul class=\"hs10-quote-list\"><li>Steel grade and measured hardness (HRC)<\/li><li>Cutting operation and required tool shape (4E \/ 4R \/ 2B)<\/li><li>Diameter D, shank d, cutting length H and overall length L; R if needed<\/li><li>Machine\/holder details, cutting conditions, quantity and drawing if available<\/li><\/ul><\/div><div class=\"hs10-quote-panel\"><h3>Request Pricing &amp; Specifications<\/h3><p class=\"hs10-quote-subtitle\">Share material hardness, cutter requirements and quantity when available.<\/p><div class=\"hs10-wpforms-holder\" id=\"hs10-wpforms-quote\"><div class=\"wpforms-container \" id=\"wpforms-1078\"><form id=\"wpforms-form-1078\" class=\"wpforms-validate wpforms-form\" data-formid=\"1078\" method=\"post\" enctype=\"multipart\/form-data\" action=\"\/ru\/wp-json\/wp\/v2\/pages\/18841\" data-token=\"9a2c646ed9d80233c9609b95c385e0c6\" data-token-time=\"1793632125\"><noscript class=\"wpforms-error-noscript\">\u0414\u043b\u044f \u0437\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u043e\u0439 \u0444\u043e\u0440\u043c\u044b \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435 JavaScript \u0432 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0435.<\/noscript><div class=\"wpforms-field-container\"><div id=\"wpforms-1078-field_0-container\" class=\"wpforms-field wpforms-field-name\" data-field-id=\"0\"><label class=\"wpforms-field-label wpforms-label-hide\" for=\"wpforms-1078-field_0\">Name <span class=\"wpforms-required-label\">*<\/span><\/label><input type=\"text\" id=\"wpforms-1078-field_0\" class=\"wpforms-field-large wpforms-field-required\" name=\"wpforms[fields][0]\" placeholder=\"Name\" required><\/div>\t\t<div id=\"wpforms-1078-field_3-container\"\n\t\t\tclass=\"wpforms-field wpforms-field-text\"\n\t\t\tdata-field-type=\"text\"\n\t\t\tdata-field-id=\"3\"\n\t\t\t>\n\t\t\t<label class=\"wpforms-field-label\" for=\"wpforms-1078-field_3\" >Message or WhatsApp<\/label>\n\t\t\t<input type=\"text\" id=\"wpforms-1078-field_3\" class=\"wpforms-field-medium\" name=\"wpforms[fields][3]\" >\n\t\t<\/div>\n\t\t<div id=\"wpforms-1078-field_1-container\" class=\"wpforms-field wpforms-field-email\" data-field-id=\"1\"><label class=\"wpforms-field-label wpforms-label-hide\" for=\"wpforms-1078-field_1\">Email <span class=\"wpforms-required-label\">*<\/span><\/label><input type=\"email\" id=\"wpforms-1078-field_1\" class=\"wpforms-field-large wpforms-field-required\" name=\"wpforms[fields][1]\" placeholder=\"Email\" spellcheck=\"false\" required><\/div><div id=\"wpforms-1078-field_4-container\" class=\"wpforms-field wpforms-field-number\" data-field-id=\"4\"><label class=\"wpforms-field-label wpforms-label-hide\" for=\"wpforms-1078-field_4\">WhatsApp <span class=\"wpforms-required-label\">*<\/span><\/label><input type=\"number\" id=\"wpforms-1078-field_4\" class=\"wpforms-field-large wpforms-field-required\" name=\"wpforms[fields][4]\" placeholder=\"WhatsApp\" step=\"any\" required><\/div><div id=\"wpforms-1078-field_2-container\" class=\"wpforms-field wpforms-field-textarea\" data-field-id=\"2\"><label class=\"wpforms-field-label wpforms-label-hide\" for=\"wpforms-1078-field_2\">Comment or Message <span class=\"wpforms-required-label\">*<\/span><\/label><textarea id=\"wpforms-1078-field_2\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][2]\" placeholder=\"Message\" required><\/textarea><\/div><script>\n\t\t\t\t( function() {\n\t\t\t\t\tconst style = document.createElement( 'style' );\n\t\t\t\t\tstyle.appendChild( document.createTextNode( '#wpforms-1078-field_3-container { position: absolute !important; 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TOOL STEEL Carbide End Mills for Hardened &amp; High-Hardness Steel Select solid carbide end mills for hardened tool steel, mold components and high-HRC machining. Compare HMH and HMX high-hardness series, the HMM general-purpose option and three cutting geometries: square, corner radius [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":18937,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-18841","page","type-page","status-publish","hentry"],"acf":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Jiang.xu","author_link":"https:\/\/onmytoolings.com\/ru\/author\/bigsunjianggmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Home \/ Applications \/ End Mills for Hardened Steel HARD MILLING \u00b7 MOLD &amp; TOOL STEEL Carbide End Mills for Hardened &amp; High-Hardness Steel Select solid carbide end mills for hardened tool steel, mold components and high-HRC machining. Compare HMH and HMX high-hardness series, the HMM general-purpose option and three cutting geometries: square, corner radius&hellip;","_links":{"self":[{"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/pages\/18841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/comments?post=18841"}],"version-history":[{"count":10,"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/pages\/18841\/revisions"}],"predecessor-version":[{"id":19918,"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/pages\/18841\/revisions\/19918"}],"up":[{"embeddable":true,"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/pages\/18937"}],"wp:attachment":[{"href":"https:\/\/onmytoolings.com\/ru\/wp-json\/wp\/v2\/media?parent=18841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}