{"product_id":"sumitomo-tnmg160404l-hm-ac820p","title":"SUMITOMO TNMG160404L-HM AC820P Turning Insert | TNMG331","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e \u003cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"\u003e\u003cmeta name=\"description\" content=\"Buy SUMITOMO TNMG160404L-HM AC820P (TNMG331L-HM) carbide turning inserts. Premium Absotech CVD coated grade for steel machining. Factory direct price.\"\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n  *, *::before, *::after { box-sizing: border-box; }\n  body {\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: #212529;\n    background-color: #f8f9fa;\n    margin: 0;\n    padding: 0;\n    line-height: 1.6;\n  }\n  .container {\n    width: 100%;\n    max-width: 960px;\n    margin: 0 auto;\n    background: #ffffff;\n    border: 1px solid #e2e8f0;\n  }\n  .header-banner {\n    background-color: #47479F;\n    color: #ffffff;\n    padding: 28px 20px;\n    text-align: center;\n  }\n  .header-banner h1 {\n    color: #ffffff;\n    font-size: 1.8rem;\n    margin: 0 0 8px 0;\n    font-weight: 700;\n  }\n  .header-banner .subtitle {\n    font-size: 1rem;\n    color: #dbe0fe;\n  }\n  .content-padding { padding: 24px 20px; }\n  .seo-meta-box {\n    background-color: #1D1D3A;\n    color: #ffffff;\n    padding: 18px;\n    border-radius: 6px;\n    margin-bottom: 24px;\n    font-size: 0.95rem;\n  }\n  .seo-meta-box h3 { color: #9d9dfe; margin-top: 0; margin-bottom: 8px; border-bottom: 1px solid #3c3c66; padding-bottom: 4px; }\n  .seo-meta-box p { margin: 6px 0; color: #e2e8f0; }\n  .seo-meta-box strong { color: #ffffff; }\n  h2 {\n    color: #47479F;\n    font-size: 1.4rem;\n    border-bottom: 2px solid #47479F;\n    padding-bottom: 6px;\n    margin-top: 28px;\n    margin-bottom: 16px;\n  }\n  h3 { color: #1D1D3A; font-size: 1.15rem; margin-top: 20px; margin-bottom: 10px; }\n  p { margin-top: 0; margin-bottom: 14px; }\n  table {\n    width: 100%;\n    border-collapse: collapse;\n    margin-bottom: 20px;\n    font-size: 0.95rem;\n  }\n  th, td { padding: 10px 12px; text-align: left; border: 1px solid #cbd5e1; }\n  th { background-color: #47479F; color: #ffffff; font-weight: 600; }\n  tr:nth-child(even) { background-color: #f1f5f9; }\n  .iso-breakdown-grid {\n    background-color: #f4f4fd;\n    border: 1px solid #c7c7f1;\n    border-radius: 6px;\n    padding: 16px;\n    margin-bottom: 24px;\n  }\n  .code-display {\n    text-align: center;\n    font-size: 1.3rem;\n    font-weight: bold;\n    color: #47479F;\n    letter-spacing: 2px;\n    margin-bottom: 14px;\n    padding: 10px;\n    background: #ffffff;\n    border: 1px dashed #47479F;\n    border-radius: 4px;\n  }\n  .iso-item { margin-bottom: 8px; font-size: 0.95rem; }\n  .iso-item strong { color: #47479F; display: inline-block; width: 150px; }\n  .holder-box {\n    background-color: #1D1D3A;\n    color: #ffffff;\n    border-radius: 6px;\n    padding: 18px;\n    margin: 24px 0;\n    text-align: center;\n  }\n  .holder-box p { color: #ffffff; margin-bottom: 10px; }\n  .holder-box a {\n    display: inline-block;\n    background-color: #47479F;\n    color: #ffffff;\n    text-decoration: none;\n    font-weight: bold;\n    padding: 10px 20px;\n    border-radius: 4px;\n    border: 1px solid #7272d9;\n  }\n  .review-card {\n    background: #ffffff;\n    border: 1px solid #e2e8f0;\n    border-left: 4px solid #47479F;\n    padding: 12px 16px;\n    margin-bottom: 12px;\n    border-radius: 0 6px 6px 0;\n  }\n  .review-header { font-weight: bold; color: #1D1D3A; }\n  .review-stars { color: #f59e0b; }\n  .review-body { font-size: 0.9rem; color: #475569; margin-top: 4px; margin-bottom: 0; }\n  .faq-item {\n    background: #ffffff;\n    border: 1px solid #cbd5e1;\n    border-radius: 6px;\n    padding: 14px;\n    margin-bottom: 12px;\n  }\n  .faq-q { font-weight: bold; color: #47479F; margin-bottom: 6px; }\n  .faq-a { color: #334155; font-size: 0.95rem; margin: 0; }\n  .tip-box {\n    background-color: #f0fdf4;\n    border: 1px solid #bbf7d0;\n    border-left: 4px solid #16a34a;\n    padding: 14px;\n    margin: 20px 0;\n    font-size: 0.95rem;\n    border-radius: 0 4px 4px 0;\n  }\n  .tip-title { font-weight: bold; color: #15803d; margin-bottom: 4px; }\n  .alt-tags-box {\n    background: #f1f5f9;\n    border: 1px solid #cbd5e1;\n    padding: 12px;\n    border-radius: 6px;\n    font-size: 0.9rem;\n    margin-bottom: 20px;\n  }\n  .alt-tags-box ul { margin: 6px 0 0 20px; padding: 0; }\n  .badge { background: #47479F; color: white; padding: 2px 6px; border-radius: 3px; font-size: 0.8rem; }\n\u003c\/style\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"header-banner\"\u003e\n\u003ch1\u003eSUMITOMO TNMG160404L-HM AC820P Carbide Turning Insert\u003c\/h1\u003e\n\u003cdiv class=\"subtitle\"\u003eISO: TNMG160404L-HM | ANSI: TNMG331L-HM | Absotech Platinum CVD Grade for Steel Turning\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"content-padding\"\u003e\n\u003c!-- SEO \u0026 Metadata Summary --\u003e\u003c!-- ALT Tags --\u003e\u003c!-- 1. Product Overview --\u003e\n\u003ch2\u003e1. Product Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eWhich carbide insert provides the highest wear resistance and cutting speed efficiency during general-to-medium steel turning operations?\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSUMITOMO TNMG160404L-HM AC820P\u003c\/strong\u003e (ANSI equivalent: \u003cstrong\u003eTNMG331L-HM AC820P\u003c\/strong\u003e) is an industrial-grade, double-sided 60° negative triangular turning insert engineered for general-purpose to high-speed steel lathe operations. Powered by SUMITOMO's flagship \u003cstrong\u003eAbsotech® Platinum CVD coating technology\u003c\/strong\u003e, the \u003cstrong\u003eAC820P\u003c\/strong\u003e grade combines a highly dense, stress-controlled TiCN + Al2O3 multi-layer coating with a rigid carbide substrate. This engineered structure yields twice the wear resistance of conventional CVD coatings while maintaining edge toughness under elevated cutting velocities.\u003c\/p\u003e\n\u003cp\u003eFeaturing the heavy-to-medium \u003cstrong\u003eHM Chipbreaker\u003c\/strong\u003e and a Left-Hand (L) orientation, this insert incorporates a reinforced rake angle and deep chip pocket designed to control long, stringy steel chips across a wide range of feeds (0.15–0.40 mm\/rev). It prevents thermal plastic deformation and crater wear when turning carbon steels, alloy steels, and structural die steels.\u003c\/p\u003e\n\u003c!-- ISO Designation Breakdown --\u003e\n\u003ch3\u003eISO \/ ANSI Designation Breakdown\u003c\/h3\u003e\n\u003cdiv class=\"iso-breakdown-grid\"\u003e\n\u003cdiv class=\"code-display\"\u003eTNMG 160404 L - HM [ Grade: AC820P ]\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eT (Shape):\u003c\/strong\u003e Triangular 60° Indexable Insert (6 cutting edges total)\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eN (Clearance):\u003c\/strong\u003e 0° Normal Clearance (Negative insert body for maximum edge strength)\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eM (Tolerances):\u003c\/strong\u003e Medium tolerance standard (ISO Class M precision)\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eG (Feature):\u003c\/strong\u003e Double-sided with center pin hole and chipbreakers on both faces\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003e16 (Size \/ IC):\u003c\/strong\u003e Cutting edge length 16.5 mm \/ Inscribed Circle = 9.525 mm (3\/8\")\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003e04 (Thickness):\u003c\/strong\u003e Thickness s = 4.76 mm (3\/16\")\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003e04 (Corner Radius):\u003c\/strong\u003e Corner radius r = 0.4 mm (1\/64\" - fine\/medium profile)\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eL (Hand Direction):\u003c\/strong\u003e Left-hand cutting direction configuration\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eHM (Chipbreaker):\u003c\/strong\u003e Heavy-Medium machining breaker with reinforced cutting land\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eAC820P (Grade):\u003c\/strong\u003e First-choice CVD TiCN+Al2O3 coated grade for steel (ISO P10–P25)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- 2. Product Key Features --\u003e\n\u003ch2\u003e2. Product Key Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbsotech® Platinum CVD Coating:\u003c\/strong\u003e Smooth nanoscale crystal surface reduces friction, heat accumulation, and flank wear rate during high-speed turning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHM Heavy-Medium Chip Control:\u003c\/strong\u003e Designed with a wide chip pocket and reinforced cutting land that breaks tough steel chips efficiently without jamming or edge fracture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6 Indexable Cutting Edges:\u003c\/strong\u003e Double-sided triangular geometry maximizes tool utilization and significantly lowers cost-per-edge in high-volume production.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Shock Resistance:\u003c\/strong\u003e High-rigidity substrate resists micro-cracking and thermal deformation during high-speed dry and wet machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Class M Repeatability:\u003c\/strong\u003e Strict manufacturing tolerances guarantee swift insert replacement and uniform batch dimensions on CNC turning centers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 3. Technical Specifications --\u003e\n\u003ch2\u003e3. Technical Specifications \u0026amp; Metric\/Imperial Cross-Reference\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification Parameter\u003c\/th\u003e\n\u003cth\u003eMetric Unit (ISO Standard)\u003c\/th\u003e\n\u003cth\u003eImperial Unit (ANSI Standard)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsert Designation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTNMG160404L-HM\u003c\/td\u003e\n\u003ctd\u003eTNMG331L-HM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInscribed Circle (IC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9.525 mm\u003c\/td\u003e\n\u003ctd\u003e0.375\" (3\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness (S)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.76 mm\u003c\/td\u003e\n\u003ctd\u003e0.1875\" (3\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCorner Radius (RE)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.4 mm\u003c\/td\u003e\n\u003ctd\u003e0.0156\" (1\/64\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHole Diameter (D1)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.81 mm\u003c\/td\u003e\n\u003ctd\u003e0.150\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating \u0026amp; Structure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAbsotech® Platinum CVD (TiCN + Al2O3)\u003c\/td\u003e\n\u003ctd\u003eAbsotech® Platinum CVD (TiCN + Al2O3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eRecommended Cutting Parameters (Dual-Unit)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eWorkpiece Material\u003c\/th\u003e\n\u003cth\u003eCutting Speed (Vc)\u003c\/th\u003e\n\u003cth\u003eFeed Rate (f)\u003c\/th\u003e\n\u003cth\u003eDepth of Cut (ap)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUnalloyed Carbon Steel (1045)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200 - 380 m\/min\u003cbr\u003e\u003cem\u003e(655 - 1245 SFM)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.15 - 0.40 mm\/rev\u003cbr\u003e\u003cem\u003e(0.006 - 0.016 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.8 - 4.5 mm\u003cbr\u003e\u003cem\u003e(0.031 - 0.177 in)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlloy Steel (4140 \/ 4340)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e180 - 320 m\/min\u003cbr\u003e\u003cem\u003e(590 - 1050 SFM)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.12 - 0.35 mm\/rev\u003cbr\u003e\u003cem\u003e(0.005 - 0.014 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.6 - 4.0 mm\u003cbr\u003e\u003cem\u003e(0.024 - 0.157 in)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDie \/ Forged Steel (P20 \/ H13)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e140 - 250 m\/min\u003cbr\u003e\u003cem\u003e(460 - 820 SFM)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.10 - 0.30 mm\/rev\u003cbr\u003e\u003cem\u003e(0.004 - 0.012 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.5 - 3.5 mm\u003cbr\u003e\u003cem\u003e(0.020 - 0.138 in)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"holder-box\"\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Compatible Toolholders (ISO Top \u0026amp; Pin Clamp External Turning Holders):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCompatible with standard toolholders: \u003ccode\u003eMTJNR\/L 2020K16\u003c\/code\u003e, \u003ccode\u003eMTJNR\/L 2525M16\u003c\/code\u003e, \u003ccode\u003eWTJNR\/L 2020K16\u003c\/code\u003e, \u003ccode\u003ePTGNR\/L 2020K16\u003c\/code\u003e\u003c\/p\u003e\n\u003ca href=\"https:\/\/cnchome-beyond.com\/collections\/tn-insert-multi-lock-system\" target=\"_blank\" rel=\"noopener\"\u003eView Compatible MTJNR2020K16 Turning Toolholders →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- 4. Workpiece Material Matrix --\u003e\n\u003ch2\u003e4. Workpiece Material Matrix (ISO 513 Standard)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eISO Material Group\u003c\/th\u003e\n\u003cth\u003eSuitability\u003c\/th\u003e\n\u003cth\u003eCommon Grade Examples\u003c\/th\u003e\n\u003cth\u003ePerformance Rating\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eP (Steel)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"badge\"\u003ePrimary Choice\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel 1045, Alloy Steel 4140, 4340, 8620, Free-Cutting Steel\u003c\/td\u003e\n\u003ctd\u003e★★★★★ (Optimal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eK (Cast Iron)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecondary Choice\u003c\/td\u003e\n\u003ctd\u003eDuctile Iron (Nodular), Malleable Cast Iron\u003c\/td\u003e\n\u003ctd\u003e★★★☆☆ (Moderate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM (Stainless Steel)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eConditional\u003c\/td\u003e\n\u003ctd\u003eFerritic \/ Martensitic Stainless Steels (410, 420)\u003c\/td\u003e\n\u003ctd\u003e★★★☆☆ (Light Cut)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eS (Superalloys)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot Recommended\u003c\/td\u003e\n\u003ctd\u003eInconel 718, Titanium Alloys\u003c\/td\u003e\n\u003ctd\u003e★☆☆☆☆ (Not Recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- 5. Compatibility --\u003e\n\u003ch2\u003e5. Machine \u0026amp; Equipment Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis insert is fully compatible with standard CNC turning centers, multi-tasking lathes (e.g., Mazak, Haas, Doosan\/DN Solutions, Citizen, DMG MORI, Okuma), and conventional engine lathes fitted with ISO standard clamping holders (MTJNR\/L, PTGNR\/L, WTJNR\/L series).\u003c\/p\u003e\n\u003c!-- 6. Grade Comparison --\u003e\n\u003ch2\u003e6. Grade Comparison \u0026amp; Equivalent Models\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003cth\u003eEquivalent Grade\u003c\/th\u003e\n\u003cth\u003eEquivalent ISO Insert Designation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSUMITOMO (Original)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eAC820P \/ AC830P\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eTNMG160404L-HM\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSandvik Coromant\u003c\/td\u003e\n\u003ctd\u003eGC4325 \/ GC4425\u003c\/td\u003e\n\u003ctd\u003eTNMG160404-PM \/ TNMG331-PM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKennametal\u003c\/td\u003e\n\u003ctd\u003eKCP25B \/ KCP10B\u003c\/td\u003e\n\u003ctd\u003eTNMG160404MP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIscar\u003c\/td\u003e\n\u003ctd\u003eIC8250 \/ IC8150\u003c\/td\u003e\n\u003ctd\u003eTNMG160404-M3M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKyocera\u003c\/td\u003e\n\u003ctd\u003eCA525 \/ CA5525\u003c\/td\u003e\n\u003ctd\u003eTNMG160404MU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- 7. Why Choose Us \u0026 Reviews --\u003e\n\u003ch2\u003e7. Why Choose Us \u0026amp; Verified Customer Reviews\u003c\/h2\u003e\n\u003cp\u003eWe are an authorized distributor of genuine 100% original SUMITOMO Electric Hardmetal cutting tools. Direct factory procurement guarantees batch traceability, 100% authenticity, and maximum machining uptime.\u003c\/p\u003e\n\u003ch3\u003eGlobal Machinist Reviews\u003c\/h3\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eDavid Miller (USA - Apex CNC Turning Center) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003e\"Switched from AC830P to AC820P for our continuous 1045 steel bar job. The cutting speed increase from 600 SFM to 950 SFM boosted our daily output by 28% without sacrificing tool life.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eDipl.-Ing. Markus Weber (Germany - Precision Tech GmbH) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003e\"Sehr gute Verschleißfestigkeit bei C45 Turning. HM-Spannuten brechen die Späne sauber ab. Keine Gratbildung.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eLuca Rossi (Italy - Mechanical Components S.r.l.) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003e\"Eccellente inserto per acciaio legato! Standard ISO perfetto e finitura superficiale pulita.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eKenji Sato (Japan - Precision Machine Works) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003e\"住友AC820Pは高速切削での耐摩耗性が素晴らしい。HMブレーカとの組み合わせで炭素鋼の連続加工が安定しました。\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eOliver Scott (UK - Transmission Shafts Ltd) \u003cspan class=\"review-stars\"\u003e★★★★☆\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003e\"Great consistency across 100 inserts. Highly reliable tool life for lights-out automated turning.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- 8. AI-Style FAQ \u0026 Troubleshooting --\u003e\n\u003ch2\u003e8. AI-Style FAQ \u0026amp; Troubleshooting Guide\u003c\/h2\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eQ: What is the primary operational difference between SUMITOMO AC820P and AC830P grades?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA: AC820P (ISO P10–P25) is SUMITOMO's first-choice grade for general to high-speed continuous turning in steel, offering maximum flank and crater wear resistance. AC830P (ISO P20–P35) provides higher impact toughness for heavy interrupted cuts or rough forged surfaces.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eQ: When should I choose the HM chipbreaker over general-purpose chipbreakers?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA: The HM chipbreaker features a wider pocket and reinforced cutting edge, making it optimal for medium-to-heavy depths of cut (0.8–4.5 mm) and higher feeds (0.15–0.40 mm\/rev) where high cutting force would overload lighter breaker geometries.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eQ: How do I choose between Left-Hand (L) and Right-Hand (R) inserts?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA: Left-hand (L) inserts pair with left-hand turning toolholders (e.g., MTJNL series) or specific rear-toolpost configurations based on machine spindle rotation direction and slide axis setup.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eTroubleshooting Quick Reference\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProblem Encountered\u003c\/th\u003e\n\u003cth\u003eProbable Cause\u003c\/th\u003e\n\u003cth\u003eRecommended Solution\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRapid Flank Wear\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCutting speed Vc exceeds AC820P limits or dry heat overload\u003c\/td\u003e\n\u003ctd\u003eReduce cutting speed Vc by 10-15% or apply high-pressure coolant.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChipping on Interrupted Cut\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh impact shock exceeding P20 toughness envelope\u003c\/td\u003e\n\u003ctd\u003eSwitch to tough AC830P grade or reduce feed rate f during interrupted pass.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous Ribbon Chips\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDepth of cut (ap) or feed rate below HM engagement threshold\u003c\/td\u003e\n\u003ctd\u003eIncrease feed rate f closer to 0.25 - 0.35 mm\/rev to activate HM chip control wall.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"tip-box\"\u003e\n\u003cdiv class=\"tip-title\"\u003ePro Technical Tip \u0026amp; Certified Standards Reference\u003c\/div\u003e\n\u003cp\u003eIn accordance with \u003cem\u003eISO 513:2012 (Classification and application of hard cutting materials)\u003c\/em\u003e and empirical validation from Sumitomo Electric Hardmetal Research Laboratory, the AC820P Absotech® Platinum coating demonstrates a \u003cstrong\u003e2x tool life extension\u003c\/strong\u003e in ISO P20 continuous steel machining over conventional CVD coatings due to crystallographic nano-grain alignment control.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sumitomo","offers":[{"title":"Default Title","offer_id":43396397793452,"sku":"TNMG160404L-HM AC820P","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/SUMITOMO_TNMG160404L-HM_AC820P_Carbide_Turning_Insert_Front_View.jpg?v=1787467807","url":"https:\/\/cnchome-beyond.com\/products\/sumitomo-tnmg160404l-hm-ac820p","provider":"CNCHome-Beyond","version":"1.0","type":"link"}