{"id":8192,"date":"2026-09-28T17:40:09","date_gmt":"2026-09-28T17:40:09","guid":{"rendered":"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-120408\/"},"modified":"2026-10-14T07:52:14","modified_gmt":"2026-10-14T07:52:14","slug":"scmt-120408","status":"publish","type":"page","link":"https:\/\/ychltools.com\/zh\/turning-inserts\/scmt\/scmt-120408\/","title":{"rendered":"SCMT 120408 \u8f66\u524a\u5200\u7247"},"content":{"rendered":"\n<main class=\"ychl-catalog-v4 ychl-parent-page\" data-kind=\"turning\"><nav class=\"ychl-type-tabs\" aria-label=\"Product type\"><a class=\"\" href=\"\/products\/\">All Inserts<\/a><a class=\"is-active\" href=\"\/turning-inserts\/\">Turning Inserts<\/a><a class=\"\" href=\"\/milling-inserts\/\">Milling Inserts<\/a><\/nav><div class=\"ychl-catalog-shell\"><nav class=\"ychl-crumbs\" aria-label=\"Breadcrumb\"><a href=\"\/products\/\">Products<\/a><span>\/<\/span><a href=\"\/turning-inserts\/\">Turning Inserts<\/a><span>\/<\/span><a href=\"\/turning-inserts\/scmt\/\">SCMT<\/a><span>\/<\/span><span aria-current=\"page\">SCMT 120408<\/span><\/nav><section class=\"ychl-parent-hero\"><div class=\"ychl-parent-image\"><img decoding=\"async\" src=\"https:\/\/ychltools.com\/wp-content\/uploads\/2026\/09\/ychl-product-std-53f17ead8314d840.png\" alt=\"SCMT 120408 turning insert\"><\/div><div class=\"ychl-parent-intro\"><h1>SCMT 120408 Turning Inserts<\/h1><p>Compare suitable materials and applications, then choose a brand to view the exact SKUs.<\/p><dl class=\"ychl-shared-specs\"><div><dt>ISO Code<\/dt><dd>SCMT120408<\/dd><\/div><div><dt>Insert Size<\/dt><dd>120408<\/dd><\/div><div><dt>Shape<\/dt><dd>S<\/dd><\/div><\/dl><\/div><\/section><section class=\"ychl-option-finder\"><div class=\"ychl-section-heading\"><h2>Find the Right Option<\/h2><p>Select the workpiece material and application. Brand remains optional.<\/p><\/div><div class=\"ychl-option-grid\"><fieldset><legend>1. Workpiece Material<\/legend><div class=\"ychl-material-choices\"><button type=\"button\" class=\"ychl-mat-choice ychl-mat-p\" data-parent-material=\"P\"><b>P<\/b><span>Steel<\/span><\/button><button type=\"button\" class=\"ychl-mat-choice ychl-mat-m\" data-parent-material=\"M\"><b>M<\/b><span>Stainless Steel<\/span><\/button><button type=\"button\" class=\"ychl-mat-choice ychl-mat-k\" data-parent-material=\"K\"><b>K<\/b><span>Cast Iron<\/span><\/button><button type=\"button\" class=\"ychl-mat-choice ychl-mat-s\" data-parent-material=\"S\"><b>S<\/b><span>Heat-resistant Alloys<\/span><\/button><\/div><\/fieldset><fieldset><legend>2. Application<\/legend><div class=\"ychl-stage-choices\"><button type=\"button\" data-parent-application=\"Finishing\">Finishing<\/button><button type=\"button\" data-parent-application=\"Medium\">Medium<\/button><button type=\"button\" data-parent-application=\"Roughing\">Roughing<\/button><\/div><\/fieldset><label>3. Brand<select data-parent-brand><option value=\"\">All Brands<\/option><option>Achteck<\/option><\/select><\/label><\/div><\/section><section class=\"ychl-matching-brands\"><div class=\"ychl-section-heading\"><h2>Brands<\/h2><p data-match-summary>All available options for this parent model.<\/p><\/div><div class=\"ychl-brand-match-list\"><article class=\"ychl-brand-match\" data-brand=\"Achteck\" data-material=\"P,M,K,S\" data-application=\"Finishing,Medium,Roughing\"><div class=\"ychl-brand-match-image\"><img decoding=\"async\" src=\"https:\/\/ychltools.com\/wp-content\/uploads\/2026\/09\/ychl-product-std-53f17ead8314d840.png\" alt=\"Achteck SCMT120408 insert\" loading=\"lazy\"><\/div><div class=\"ychl-brand-match-copy\"><div class=\"ychl-brand-card-heading\"><strong>Achteck<\/strong><span class=\"ychl-brand-option-count\" data-match-count>25 Options<\/span><\/div><div class=\"ychl-brand-card-fact\"><b>Workpiece Material<\/b><span class=\"ychl-materials\"><span class=\"ychl-mat ychl-mat-p\" title=\"Steel\">P<\/span><span class=\"ychl-mat ychl-mat-m\" title=\"Stainless Steel\">M<\/span><span class=\"ychl-mat ychl-mat-k\" title=\"Cast Iron\">K<\/span><span class=\"ychl-mat ychl-mat-s\" title=\"Heat-resistant Alloys\">S<\/span><\/span><\/div><div class=\"ychl-brand-card-fact\"><b>Application<\/b><span>Finishing \u00b7 Medium \u00b7 Roughing<\/span><\/div><\/div><div class=\"ychl-brand-match-action\"><a href=\"\/turning-inserts\/scmt\/scmt-120408\/achteck\/\">View Options <span aria-hidden=\"true\">\u2192<\/span><\/a><\/div><\/article><\/div><\/section><\/div><script type=\"application\/json\" class=\"ychl-parent-option-data\">[{\"brand\":\"Achteck\",\"material\":[\"P\",\"M\"],\"application\":[\"Finishing\",\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"K\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"K\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"K\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"M\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"P\",\"K\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Roughing\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"P\",\"M\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"M\",\"S\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"P\",\"K\"],\"application\":[\"Medium\"]},{\"brand\":\"Achteck\",\"material\":[\"P\"],\"application\":[\"Medium\"]}]<\/script><\/main>\n","protected":false},"excerpt":{"rendered":"<p>All InsertsTurning InsertsMilling Inserts Products\/Turning Inserts\/SCMT\/SCMT 120408 SCMT 120408 Turning Inserts Compare suitable materials and applications, then choose a brand to view the exact SKUs. ISO Code SCMT120408 Insert Size 120408 Shape S Find the Right Option Select the workpiece material and application. Brand remains optional. 1. Workpiece Material PSteelMStainless SteelKCast IronSHeat-resistant Alloys 2. Application [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3036,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":"","_ychl_meta_desc":"SCMT 120408 indexable turning inserts \u2014 25 options, for K\/M\/P\/S, finishing to roughing cuts, from Achteck. Cutting parameters and RFQ in 24 h.","_ychl_model_html":"<p>A square 90\u00b0 turning insert with 8 cutting edges, SCMT 120408 is stocked here in <strong>25<\/strong> variants from Achteck. Published applications cover Steel, Stainless steel, Cast iron, Heat-resistant alloys. Key dimensions: 12.7 mm inscribed circle, 4.76 mm thickness, 0.8 mm nose radius.<\/p>\n<p>The designation encodes the geometry: the first letter is the shape (S), the following letter the clearance angle, then the tolerance class, then size, thickness and nose radius. If you want to check any of it, our <a href=\"\/resources\/iso-insert-code-decoder\/\">ISO insert code decoder<\/a> breaks the full string down character by character.<\/p>\n<h2>Geometry and dimensions<\/h2>\n<div class=\"ychl-art-table\"><table><tbody>\n<tr><th>Insert family<\/th><td><a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/\">SCMT<\/a><\/td><\/tr>\n<tr><th>Category<\/th><td><a href=\"https:\/\/ychltools.com\/turning-inserts\/\">Turning Inserts<\/a><\/td><\/tr>\n<tr><th>Shape<\/th><td>square 90\u00b0 (S)<\/td><\/tr>\n<tr><th>Usable cutting edges<\/th><td>8<\/td><\/tr>\n<tr><th>Inscribed circle (IC)<\/th><td>12.7 mm<\/td><\/tr>\n<tr><th>Thickness (S)<\/th><td>4.76 mm<\/td><\/tr>\n<tr><th>Nose radius (RE)<\/th><td>0.8 mm<\/td><\/tr>\n<tr><th>Fixing hole diameter (D1)<\/th><td>5.5 mm<\/td><\/tr>\n<tr><th>Hand<\/th><td>Neutral<\/td><\/tr>\n<tr><th>Variants in stock<\/th><td>25<\/td><\/tr>\n<tr><th>Brands<\/th><td>Achteck<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<h2>Recommended cutting data<\/h2>\n<p>The figures below are the manufacturers' published ranges, aggregated across the 25 variants listed on this page. The <em>typical<\/em> column is the median, which is where most shops end up running. Treat the full range as the envelope, not a target \u2014 start around 60\u201370% of it and work up.<\/p>\n<div class=\"ychl-art-table\"><table>\n<thead><tr><th>Workpiece material<\/th><th>Cutting speed vc (m\/min)<\/th><th>Typical vc<\/th><th>Feed fn (mm\/rev)<\/th><th>Depth of cut ap (mm)<\/th><th>Variants with data<\/th><\/tr><\/thead><tbody>\n<tr><td><strong>Steel (P)<\/strong><\/td><td>45 \u2013 620<\/td><td><strong>75 \u2013 380<\/strong><\/td><td>0.1\u20130.4<\/td><td>0.7\u20134.2<\/td><td>12 of 25<\/td><\/tr>\n<tr><td><strong>Stainless steel (M)<\/strong><\/td><td>70 \u2013 250<\/td><td><strong>85 \u2013 200<\/strong><\/td><td>0.1\u20130.4<\/td><td>0.7\u20134.2<\/td><td>9 of 25<\/td><\/tr>\n<tr><td><strong>Cast iron (K)<\/strong><\/td><td>50 \u2013 490<\/td><td><strong>95 \u2013 400<\/strong><\/td><td>0.1\u20130.36<\/td><td>0.7\u20134.2<\/td><td>5 of 25<\/td><\/tr>\n<tr><td><strong>Heat-resistant alloys (S)<\/strong><\/td><td>20 \u2013 200<\/td><td><strong>30 \u2013 85<\/strong><\/td><td>0.1\u20130.36<\/td><td>0.7\u20134.2<\/td><td>8 of 25<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>To turn a cutting speed into a spindle speed for your actual diameter, use the <a href=\"\/resources\/cutting-parameters-calculator\/\">cutting parameters calculator<\/a>: n = vc \u00d7 1000 \/ (\u03c0 \u00d7 D).<\/p>\n<h2>Carbide grades available<\/h2>\n<p>25 variants of SCMT 120408 are stocked in these grades: <strong>AP200U<\/strong>, <strong>AC052P<\/strong>, <strong>AC100M<\/strong>, <strong>AC152P<\/strong>, <strong>AC200M<\/strong>, <strong>AC252P<\/strong>, <strong>AP200M<\/strong>, <strong>AT202<\/strong>, <strong>AT210A<\/strong>, <strong>AC100K<\/strong>, <strong>AC102K<\/strong>, <strong>AC202K<\/strong>, <strong>AC350P<\/strong>, <strong>AP100S<\/strong> and others.<\/p>\n<p>Across this range the grades specified most often are AP200U, AC052P, AC100M, AC152P, AC200M. Within one brand's range, a higher middle digit usually means a tougher grade \u2014 better on interrupted cuts, slightly less wear resistant. See <a href=\"\/resources\/carbide-grades-explained\/\">carbide grades explained<\/a> for how to read the names.<\/p>\n<h2>Chipbreaker geometries<\/h2>\n<p>Chipbreakers stocked for SCMT 120408: KC2, PC2, PB2.<\/p>\n<p>The chipbreaker sets the usable feed window far more than the depth of cut does. A roughing geometry run at finishing feed will not break the chip; a finishing geometry pushed into a roughing cut will chip. Match it to the feed you will actually run \u2014 <a href=\"\/resources\/chipbreaker-selection-guide\/\">chipbreaker selection guide<\/a>.<\/p>\n<h2>Typical applications<\/h2>\n<ul>\n<li>Roughing<\/li>\n<li>Medium<\/li>\n<li>Finishing<\/li>\n<\/ul>\n<p>For more on cutting steel, see our <a href=\"\/resources\/iso-513-material-groups\/\">material-specific guide<\/a>.<\/p>\n<h2>Choosing the right SCMT 120408<\/h2>\n<p>Three things decide which variant you need:<\/p><ol>\n<li><strong>The workpiece material group.<\/strong> This page lists variants published for Steel, Stainless steel, Cast iron, Heat-resistant alloys. Pick a grade from the group you are cutting \u2014 a steel grade on a superalloy will fail quickly.<\/li>\n<li><strong>Feed, not depth of cut.<\/strong> The chipbreaker is defined by its feed window. Decide the feed first, then pick the geometry that covers it.<\/li>\n<li><strong>Nose radius versus finish.<\/strong> SCMT 120408 is stocked here at 0.8 mm. A larger radius gives better finish at the same feed and a stronger edge, but raises cutting force.<\/li>\n<\/ol>\n<p>Not sure whether SCMT 120408 is the right shape at all? The <a href=\"\/resources\/turning-insert-selection-guide\/\">turning insert selection guide<\/a> compares shapes by what the part profile allows.<\/p>\n<h2>Frequently asked questions about SCMT 120408<\/h2>\n<h3>What size insert is SCMT 120408?<\/h3><p>SCMT 120408 has an inscribed circle of 12.7 mm and a thickness of 4.76 mm. As a rule the depth of cut should stay under about two thirds of the inscribed circle.<\/p>\n<h3>What nose radius does SCMT 120408 have?<\/h3><p>The nose radius (the last two digits of the designation) is 0.8 mm on the variants listed here. Surface roughness scales roughly with fn\u00b2\/(32 \u00d7 RE), so at a fixed feed a larger radius halves Ra.<\/p>\n<h3>Which holder does SCMT 120408 fit?<\/h3><p>The holder designation must carry the same shape letter (S) and the same size digit. Send us your holder code and we will confirm the match before you order.<\/p>\n<h3>How many SCMT 120408 variants do you stock?<\/h3><p>25 variants from Achteck, listed below with grade, chipbreaker and the published cutting data where the manufacturer provides it.<\/p>\n<h3>What cutting speed should I run for SCMT 120408?<\/h3><p>For Steel, the published range across these variants is 45\u2013620 m\/min, with a typical window of 75\u2013380 m\/min. Heavy cuts sit at the bottom of that range, light finishing cuts at the top.<\/p>\n<h2>Related<\/h2><ul>\n<li>Same family: <a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-09t308\/\">SCMT 09T308<\/a>, <a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-09t304\/\">SCMT 09T304<\/a>, <a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-120404\/\">SCMT 120404<\/a>, <a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-120412\/\">SCMT 120412<\/a>, <a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-380932\/\">SCMT 380932<\/a><\/li>\n<li><a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/\">All SCMT<\/a><\/li>\n<li><a href=\"https:\/\/ychltools.com\/turning-inserts\/scmt\/scmt-120408\/achteck\/\">Achteck SCMT 120408<\/a> (25 variants)<\/li>\n<li><a href=\"\/resources\/iso-insert-code-decoder\/\">Decode the SCMT 120408 designation<\/a><\/li>\n<li><a href=\"\/resources\/cutting-parameters-calculator\/\">Cutting speed to rpm calculator<\/a><\/li>\n<li><a href=\"\/resources\/turning-insert-selection-guide\/\">Turning insert selection guide<\/a><\/li>\n<\/ul>"},"class_list":["post-8192","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/pages\/8192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/comments?post=8192"}],"version-history":[{"count":1,"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/pages\/8192\/revisions"}],"predecessor-version":[{"id":10008,"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/pages\/8192\/revisions\/10008"}],"up":[{"embeddable":true,"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/pages\/3036"}],"wp:attachment":[{"href":"https:\/\/ychltools.com\/zh\/wp-json\/wp\/v2\/media?parent=8192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}