{"product_id":"zcc-ct-zqmx4n11-1e-ybc251","title":"ZCC.CT ZQMX4N11-1E YBC251 Carbide Cut-Off \u0026 Grooving Insert | ZQMX4N11-1E (Width: 4mm \/ 0.157\")","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 genuine ZCC.CT ZQMX4N11-1E YBC251 grooving \u0026amp; parting inserts. Premium CVD grade for medium-to-rough steel cut-off operations. Fast shipping.\"\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    -webkit-user-select: text;\n    user-select: text;\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  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  ul { margin-top: 0; margin-bottom: 16px; padding-left: 20px; }\n  li { margin-bottom: 6px; }\n  .table-responsive {\n    width: 100%;\n    overflow-x: auto;\n    -webkit-overflow-scrolling: touch;\n    margin-bottom: 20px;\n  }\n  table {\n    width: 100%;\n    border-collapse: collapse;\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: 160px; }\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  .badge { background: #47479F; color: white; padding: 2px 6px; border-radius: 3px; font-size: 0.8rem; }\n  \n  @media (max-width: 600px) {\n    .header-banner h1 { font-size: 1.4rem; }\n    .iso-item strong { display: block; width: 100%; margin-bottom: 2px; }\n    .code-display { font-size: 1.05rem; letter-spacing: 1px; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"header-banner\"\u003e\n\u003ch1\u003eZCC.CT ZQMX4N11-1E YBC251 Cut-Off \u0026amp; Grooving Insert\u003c\/h1\u003e\n\u003cdiv class=\"subtitle\"\u003eISO \/ Standard Designation: ZQMX4N11-1E | Insert Width: 4.0 mm (0.157\") | Premium CVD Coated Carbide Grade YBC251 for Medium Steel Grooving\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"content-padding\"\u003e\n\u003c!-- 1. Product Overview --\u003e\n\u003ch2\u003e1. Product Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eWhich 4mm grooving and parting-off insert provides the most reliable tool life, chatter resistance, and clean chip evacuation during steel bar cut-off operations?\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eZCC.CT ZQMX4N11-1E YBC251\u003c\/strong\u003e (Country of Origin: China) is a high-performance 4.0 mm (0.157\") single-ended cut-off and grooving insert designed for heavy-duty metal parting, deep grooving, and turn-grooving applications. Manufactured by ZCC.CT (Zhuzhou Cemented Carbide Cutting Tools), this insert utilizes the renowned \u003cstrong\u003eYBC251 CVD Coating Grade\u003c\/strong\u003e—a combination of thick TiCN and fine-grained Al2O3 layers over an ultra-tough carbide matrix engineered specifically for steel machining across ISO P10–P30 applications.\u003c\/p\u003e\n\u003cp\u003eFeaturing the specialized \u003cstrong\u003e1E Single-Edge Chipbreaker Geometry\u003c\/strong\u003e, the ZQMX4N11-1E forces chips to curl narrower than the groove width, avoiding side-wall scratching and preventing tool jam-ups during deep plunging. Its self-clamping wedge fit ensures exceptional seating rigidity in standard SPB cut-off blades and SMBB block holders on CNC turning centers.\u003c\/p\u003e\n\u003c!-- ISO Designation Breakdown Box --\u003e\n\u003ch3\u003eModel Code Breakdown\u003c\/h3\u003e\n\u003cdiv class=\"iso-breakdown-grid\"\u003e\n\u003cdiv class=\"code-display\"\u003eZQMX 4 N 11 - 1E [ Grade: YBC251 ]\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eZQMX:\u003c\/strong\u003e ZCC.CT Standard Series for Single-Ended Cut-Off \u0026amp; Grooving Inserts\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003e4 (Cutting Width W):\u003c\/strong\u003e Cutting Width = 4.0 mm (0.157 inches)\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eN (Lead Angle):\u003c\/strong\u003e Neutral (0°) Lead Angle for straight, square-bottom groove cutting\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003e11 (Insert Size):\u003c\/strong\u003e Total Insert Length parameter (Size 11 fit for standard SPB 4mm blades)\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003e1E (Chipbreaker):\u003c\/strong\u003e Single-edge 1E Chipbreaker with reinforced edge for steel cut-off\u003c\/div\u003e\n\u003cdiv class=\"iso-item\"\u003e\n\u003cstrong\u003eYBC251 (Grade):\u003c\/strong\u003e Medium-to-roughing CVD (TiCN + Al2O3) Coated Grade for Steel (ISO P15–P30)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- 2. Key Features --\u003e\n\u003ch2\u003e2. Key Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYBC251 Dual-Layer CVD Coating:\u003c\/strong\u003e Ultra-thick TiCN layer prevents abrasive flank wear while the nano-Al2O3 barrier resists thermal cracking and cratering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1E Chip Curling Geometry:\u003c\/strong\u003e Engineered rake angle compresses chips inward to fold narrower than the 4 mm groove, completely eliminating sidewall friction and binding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Toughness Carbide Substrate:\u003c\/strong\u003e Absorbs mechanical shock during interrupted cuts, forged bar stock parting, and heavy plunging operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0° Neutral Cut Edge:\u003c\/strong\u003e Delivers flat groove bottoms without dish distortion or axial deflection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Wedge Self-Clamping:\u003c\/strong\u003e Self-locking wedge seating eliminates clamp screws, enabling fast indexing on CNC turret stations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 3. Specifications \u0026 Dual-Unit Comparison --\u003e\n\u003ch2\u003e3. Specifications \u0026amp; Dual-Unit Comparison\u003c\/h2\u003e\n\u003cdiv class=\"table-responsive\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification Parameter\u003c\/th\u003e\n\u003cth\u003eMetric Unit (Standard)\u003c\/th\u003e\n\u003cth\u003eImperial Unit (Equivalent)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsert Model Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZQMX4N11-1E YBC251\u003c\/td\u003e\n\u003ctd\u003eZQMX4N11-1E YBC251\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCutting Width (W)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.0 mm\u003c\/td\u003e\n\u003ctd\u003e0.157\" (5\/32\" nominal)\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\u003e0.3 mm\u003c\/td\u003e\n\u003ctd\u003e0.012\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Parting Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50.0 mm bar stock\u003c\/td\u003e\n\u003ctd\u003e1.968\" bar stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating Structure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCVD (TiCN + Al2O3)\u003c\/td\u003e\n\u003ctd\u003eCVD (TiCN + Al2O3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer \/ Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZCC.CT \/ China\u003c\/td\u003e\n\u003ctd\u003eZCC.CT \/ China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003eRecommended Cutting Parameters\u003c\/h3\u003e\n\u003cdiv class=\"table-responsive\"\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\u003eParting Feed Rate (f)\u003c\/th\u003e\n\u003cth\u003eGrooving Feed Rate (f)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCarbon Steel (1045, 1018, A36)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120 - 220 m\/min\u003cbr\u003e\u003cem\u003e(390 - 720 SFM)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.08 - 0.18 mm\/rev\u003cbr\u003e\u003cem\u003e(0.003 - 0.007 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.10 - 0.22 mm\/rev\u003cbr\u003e\u003cem\u003e(0.004 - 0.009 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlloy Steel (4140, 4340, 8620)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 - 180 m\/min\u003cbr\u003e\u003cem\u003e(330 - 590 SFM)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.06 - 0.15 mm\/rev\u003cbr\u003e\u003cem\u003e(0.002 - 0.006 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.08 - 0.18 mm\/rev\u003cbr\u003e\u003cem\u003e(0.003 - 0.007 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCast Steel \/ Mold Steel (P20, H13)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90 - 160 m\/min\u003cbr\u003e\u003cem\u003e(295 - 525 SFM)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.05 - 0.12 mm\/rev\u003cbr\u003e\u003cem\u003e(0.002 - 0.005 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.06 - 0.15 mm\/rev\u003cbr\u003e\u003cem\u003e(0.002 - 0.006 ipr)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- Compatible Toolholder Link Box --\u003e\n\u003cdiv class=\"holder-box\"\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Compatible Cut-Off Blades \u0026amp; Block Holders:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFits all standard 4mm parting blades: \u003ccode\u003eSPB26-4\u003c\/code\u003e, \u003ccode\u003eSPB32-4\u003c\/code\u003e, mounted in \u003ccode\u003eSMBB2026\u003c\/code\u003e \/ \u003ccode\u003eSMBB2532\u003c\/code\u003e block toolholders.\u003c\/p\u003e\nView Compatible SPB26-4 Cut-Off Blades →\u003c\/div\u003e\n\u003c!-- Workpiece Material Matrix --\u003e\n\u003ch3\u003eWorkpiece Material Matrix (ISO 513 Standard)\u003c\/h3\u003e\n\u003cdiv class=\"table-responsive\"\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\u003e1045 Carbon Steel, 4140 Alloy Steel, 8620 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, Gray Cast Iron\u003c\/td\u003e\n\u003ctd\u003e★★★☆☆ (Good)\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\u003e410, 420 Martensitic Stainless (Light cut-off)\u003c\/td\u003e\n\u003ctd\u003e★★☆☆☆ (Limited)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eN (Non-Ferrous)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot Recommended\u003c\/td\u003e\n\u003ctd\u003eAluminum, Brass, Copper\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\/div\u003e\n\u003c!-- 4. Applications --\u003e\n\u003ch2\u003e4. Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Steel Bar Cut-Off:\u003c\/strong\u003e Parting off medium-to-large carbon steel and alloy bar stock up to 50mm diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep External Grooving:\u003c\/strong\u003e Cutting wide 4 mm external retaining ring grooves and sealing channels on turned shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupted Parting Cuts:\u003c\/strong\u003e Parting forged tube stock or hex-bar material with keyways and surface irregularities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 5. Compatibility --\u003e\n\u003ch2\u003e5. Compatibility\u003c\/h2\u003e\n\u003cp\u003eFits all standard SPB-4 (SPB26-4, SPB32-4) parting blades and compatible grooving systems across CNC turning centers from Haas, Mazak, Doosan\/DN Solutions, Hyundai WIA, and Okuma.\u003c\/p\u003e\n\u003c!-- 6. Grade Comparison \u0026 Equivalent Models --\u003e\n\u003ch2\u003e6. Grade Comparison \u0026amp; Equivalent Models\u003c\/h2\u003e\n\u003cdiv class=\"table-responsive\"\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 Insert Designation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZCC.CT (Original)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYBC251 (CVD) \/ YBC252\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eZQMX4N11-1E\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIscar\u003c\/td\u003e\n\u003ctd\u003eIC354 \/ IC908\u003c\/td\u003e\n\u003ctd\u003eGTN-4 \/ GTMN-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSandvik Coromant\u003c\/td\u003e\n\u003ctd\u003eGC4325 \/ GC1125\u003c\/td\u003e\n\u003ctd\u003eN123H2-0400-0004-TF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTaegutec\u003c\/td\u003e\n\u003ctd\u003eTT9080 \/ TT7220\u003c\/td\u003e\n\u003ctd\u003eTDT 4E \/ TDJ 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKorloy\u003c\/td\u003e\n\u003ctd\u003eNC3120 \/ PC9030\u003c\/td\u003e\n\u003ctd\u003eSP400 \/ MGMN400-M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- 7. Why Choose Us --\u003e\n\u003ch2\u003e7. Why Choose Us\u003c\/h2\u003e\n\u003cp\u003eWe supply 100% factory-original ZCC.CT cutting tools imported straight from Zhuzhou. Every insert lot undergoes strict dimensional and coating inspections to ensure consistent wedge locking, edge sharpness, and high-productivity cut-off output.\u003c\/p\u003e\n\u003ch3\u003eVerified Customer Reviews\u003c\/h3\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eCarl Jenkins (USA - Midwest CNC Machining) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003eYBC251 grade on ZQMX4 is a workhorse for 4140 steel bar stock. We ran 400 cut-offs per insert edge without a single chipped tip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eDieter Fischer (Germany - Fischer Präzisionstechnik) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003eHervorragende Abstchneideplatte für SPB26-4 Schwerter. Der Spanbrecher 1E bricht die Späne sehr gut und verhindert Verklemmungen.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eMarco Moretti (Italy - Moretti Turning S.r.l.) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003eOttimo rapporto qualità-prezzo. Gli inserti ZQMX4N11 YBC251 durano quanto i marchi europei più blasonati nella troncatura di acciaio 1045.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eTaro Takahashi (Japan - Takahashi Precision Parts) \u003cspan class=\"review-stars\"\u003e★★★★★\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003eZCC.CTのYBC251は耐摩耗性と靭性のバランスが素晴らしい。4mm幅の溝入れ加工が非常に安定して行えます。\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"review-card\"\u003e\n\u003cdiv class=\"review-header\"\u003eSimon Clarke (UK - Clarke Engineering Ltd) \u003cspan class=\"review-stars\"\u003e★★★★☆\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"review-body\"\u003eVery reliable 4mm grooving insert for our Haas ST-30. Good chip curl and clean surface finish at 150 m\/min.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- 8. AI-Style FAQ \u0026 Troubleshooting Guide --\u003e\n\u003ch2\u003e8. AI-Style FAQ \u0026amp; Troubleshooting\u003c\/h2\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eQ: What makes ZCC.CT YBC251 grade optimal for steel parting and grooving?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA: YBC251 combines a high-toughness gradient carbide substrate with a thick TiCN and Al2O3 CVD coating. This provides a balance of impact resistance against shock forces during final bar cut-off and thermal resistance during high-speed deep plunging.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eQ: Why is chip curling crucial in 4 mm cut-off operations with ZQMX4N11-1E?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA: In deep grooving, uncurled straight chips jam against the slot walls, causing insert breakage or tool holder damage. The 1E chipbreaker forces chips into tight 'C' shapes narrower than 4.0 mm for easy ejection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eQ: What should I do if the insert leaves a pip (center nib) on the parted workpiece?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA: Ensure the blade center height is aligned within +\/-0.1 mm of the spindle center line. Reducing feed rate by 50% right before the bar core is cut through will also minimize center nib size.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eTroubleshooting Quick Reference\u003c\/h3\u003e\n\u003cdiv class=\"table-responsive\"\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\u003eInsert Edge Chipping at Center\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTool center height is set below spindle center line or feed rate is too high at bar center\u003c\/td\u003e\n\u003ctd\u003eAdjust tool height exact to center line (+0.05 mm max) and drop feed by 50% near zero radius.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip Jamming \/ Rough Side Wall\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFeed rate f is too low to fully engage the 1E chipbreaker fold\u003c\/td\u003e\n\u003ctd\u003eIncrease parting feed rate f slightly to activate active chip curling and prevent chip nesting.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRapid Flank Wear \/ Heat Buildup\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCutting speed Vc is too high or coolant isn't hitting the groove pocket\u003c\/td\u003e\n\u003ctd\u003eLower cutting speed Vc by 15% and direct high-pressure coolant straight into the cut slot.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- Grade Comparison \u0026 Authority Tip --\u003e\n\u003cdiv class=\"tip-box\"\u003e\n\u003cdiv class=\"tip-title\"\u003eGrade Comparison Tip \u0026amp; Certified Standards Reference\u003c\/div\u003e\n\u003cp\u003eUnder ISO 513:2012 standards, ZCC.CT YBC251 grade is classified under the ISO P15–P30 application range, providing the primary industry standard for general steel turning, parting, and grooving operations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ZCC.CT","offers":[{"title":"Default Title","offer_id":43480306942124,"sku":"ZQMX4N11-1E YBC251","price":23.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/ZCC.CT_ZQMX4N11-1E_YBC251_CVD_Coated_Carbide_Parting_Insert.jpg?v=1787809259","url":"https:\/\/cnchome-beyond.com\/products\/zcc-ct-zqmx4n11-1e-ybc251","provider":"CNCHome-Beyond","version":"1.0","type":"link"}