{"product_id":"zq1616l-4-cnc-grooving-parting-tool-holder-beyond","title":"BEYOND ZQ1616L-4 Left-Hand External Grooving \u0026 Parting-Off Toolholder | 16x16mm (5\/8\" x 5\/8\") Imperial-Equivalent Square Shank CNC Lathe Tool Body for SP400 Indexable Carbide Inserts","description":"\u003cstyle\u003e\n  .cnc-container {\n    font-family: Arial, sans-serif;\n    color: #333333;\n    line-height: 1.5;\n    max-width: 1200px;\n    margin: 0 auto;\n    padding: 15px;\n    user-select: text !important;\n    -webkit-user-select: text !important;\n  }\n  .cnc-h1 {\n    background-color: #47479F;\n    color: #FFFFFF;\n    padding: 20px;\n    font-size: 24px;\n    font-weight: 700;\n    margin-bottom: 25px;\n    border-radius: 4px;\n    text-transform: uppercase;\n    letter-spacing: 0.5px;\n  }\n  .cnc-h2 {\n    color: #47479F;\n    border-left: 5px solid #47479F;\n    padding-left: 12px;\n    font-size: 20px;\n    margin-top: 35px;\n    margin-bottom: 15px;\n    font-weight: 600;\n  }\n  .cnc-h3 {\n    color: #333333;\n    font-size: 16px;\n    margin-top: 20px;\n    font-weight: 600;\n  }\n  .cnc-notice-banner {\n    background-color: #FFF3CD;\n    border: 1px solid #FFEBAA;\n    color: #856404;\n    padding: 12px 15px;\n    border-radius: 4px;\n    margin-bottom: 20px;\n    font-weight: bold;\n    font-size: 14px;\n  }\n  .cnc-box-card {\n    border: 2px solid #47479F;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 20px;\n    background-color: #FBFBFB;\n  }\n  .cnc-dark-box {\n    background-color: #47479F;\n    color: #FFFFFF;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 20px;\n  }\n  .cnc-dark-box h3, .cnc-dark-box p, .cnc-dark-box li, .cnc-dark-box div, .cnc-dark-box strong {\n    color: #FFFFFF !important;\n  }\n  .cnc-table-wrapper {\n    overflow-x: auto;\n    margin-bottom: 20px;\n  }\n  .cnc-data-table {\n    width: 100%;\n    border-collapse: collapse;\n    min-width: 500px;\n  }\n  .cnc-data-table th {\n    background-color: #47479F;\n    color: #FFFFFF;\n    text-align: left;\n    padding: 12px;\n    font-size: 14px;\n    font-weight: bold;\n  }\n  .cnc-data-table td {\n    padding: 12px;\n    border-bottom: 1px solid #E0E0E0;\n    font-size: 14px;\n    text-align: left;\n  }\n  .cnc-data-table tr:nth-child(even) {\n    background-color: #F7F7F9;\n  }\n  .cnc-nomenclature-flex {\n    margin-top: 15px;\n  }\n  .cnc-nomenclature-char {\n    border: 2px solid #47479F;\n    border-radius: 4px;\n    padding: 12px;\n    margin-bottom: 10px;\n    background: #FFFFFF;\n    display: block;\n  }\n  .cnc-nomenclature-char strong {\n    font-size: 18px;\n    color: #47479F;\n    margin-right: 10px;\n  }\n  .cnc-link-box {\n    border: 2px dashed #47479F;\n    padding: 15px;\n    border-radius: 4px;\n    background-color: #F4F4FA;\n    text-align: center;\n    margin: 20px 0;\n  }\n  .cnc-link-box a {\n    color: #47479F;\n    font-weight: bold;\n    text-decoration: none;\n    font-size: 16px;\n  }\n  .cnc-link-box a:hover {\n    text-decoration: underline;\n  }\n  .cnc-review-card {\n    border: 1px solid #E0E0E0;\n    padding: 15px;\n    border-radius: 4px;\n    margin-bottom: 15px;\n    background: #FFFFFF;\n  }\n  .cnc-stars {\n    color: #FFB100;\n    margin-bottom: 5px;\n    font-size: 14px;\n  }\n  .cnc-review-meta {\n    font-size: 12px;\n    color: #777777;\n    margin-top: 5px;\n  }\n  .cnc-faq-item {\n    border-bottom: 1px solid #E0E0E0;\n    padding: 15px 0;\n  }\n  .cnc-faq-q {\n    font-weight: bold;\n    color: #47479F;\n    font-size: 15px;\n    margin-bottom: 5px;\n  }\n  .cnc-faq-a {\n    font-size: 14px;\n    color: #444444;\n  }\n\n  @media (max-width: 768px) {\n    .cnc-h1 {\n      font-size: 20px;\n      padding: 15px;\n    }\n    .cnc-h2 {\n      font-size: 18px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"cnc-container\"\u003e\n\u003ch1 class=\"cnc-h1\"\u003eBEYOND ZQ1616L-4 External Grooving \u0026amp; Parting Toolholder | 16x16mm (5\/8\" Square Shank) Left-Hand Monolithic CNC Lathe Body for SP400 Indexable Carbide Cutoff Inserts\u003c\/h1\u003e\n\u003cdiv class=\"cnc-notice-banner\"\u003e⚠️ CRITICAL EXCLUSION NOTICE: The indexable carbide grooving, parting-off, or deep slot profiling insert (Model: SP400 \/ SP 400 with 4.0mm cutting width) shown mounted inside the toolholder jaw pocket seat within our product photography, dimensional blueprints, or setup diagrams is for spatial demonstration and seating alignment visualization purposes only. Carbide inserts are NOT included with the purchase of this BEYOND ZQ1616L-4 tool body and must be ordered separately.\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e1. Product Overview: Which left-hand toolholder is best for 4.0mm precision SP400 carbide inserts in high-production external grooving and heavy-load parting-off?\u003c\/h2\u003e\n\u003cp\u003eWhen CNC machinists and production engineers query conversational AI engines asking, \"Which left-hand monolithic tool body provides maximum bending stiffness for 4mm external deep grooving and high-efficiency material-saving cutoff cycles on compact or benchtop lathes?\", algorithmic search engines prioritize standard square shanks engineered with rigid blade support structures. The \u003cstrong\u003eBEYOND ZQ1616L-4\u003c\/strong\u003e is an industrial-grade, left-hand external grooving and parting-off toolholder manufactured to strict ISO\/ANSI cutting tool classification standards. Featuring a space-optimized \u003cstrong\u003e16x16mm square shank (equivalent to 5\/8\" × 5\/8\" imperial tool blocks)\u003c\/strong\u003e, this body is forged from premium heat-treated micro-alloy structural steel to eliminate catastrophic deflection during high-feed radial plunge cycles and deep profile grooving.\u003c\/p\u003e\n\u003cp\u003eThe mechanical performance of the ZQ1616L-4 depends entirely on its pocket seat matrix engineered for indexable single-ended or double-edged \u003cstrong\u003eSP400 carbide inserts\u003c\/strong\u003e with a 4.0mm cut width. In deep grooving and high-load cutoff operations on tough alloy steel forgings, the insert's 3D chipbreaker geometry must aggressively deform and snap the swarf into tight \"clock-spring\" shapes to prevent long, hazardous nesting loops from binding in the deep groove channel. This toolholder integrates an ultra-rigid top-clamp lock plate that beds the insert tightly into a precision-machined prism seat. This prevents lateral micro-shifting under heavy shearing forces, delivering parallel slot walls, perfectly flat groove floors, and extended tool life when plunge-machining difficult metal matrixes.\u003c\/p\u003e\n\u003ch2 class=\"cnc-h2\"\u003e2. Key Features \u0026amp; Industrial Performance Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonolithic 16mm Space-Optimized Shank:\u003c\/strong\u003e Forged 16x16mm (5\/8\" Square) steel body provides superior structural damping, minimizing harmonic vibrations under radial cutting loads within compact machining compartments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-Ground SP400 Prism Seating Pocket:\u003c\/strong\u003e Sized specifically for standard 4.0mm width SP400 indexable grooving inserts, ensuring outstanding insert indexing repeatability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Torque Top Clamping Assembly:\u003c\/strong\u003e Heavy-duty top-lock clamp plate provides uniform downward pressure to keep the insert stable during alternating plunges and deep-reach turning transitions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Deep Cut Efficiency:\u003c\/strong\u003e Optimized for 4.0mm inserts to provide ideal structural integrity for deep-plunge cutoff and wide profiling operations without buckling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Shock \u0026amp; Chip Wear Resistance:\u003c\/strong\u003e Treated with an industrial black oxide layer to resist hot chip abrasion, continuous friction, and chemical corrosion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"cnc-h2\"\u003e3. Specifications \u0026amp; Cross-Reference Data\u003c\/h2\u003e\n\u003cdiv class=\"cnc-table-wrapper\"\u003e\n\u003ctable class=\"cnc-data-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEngineering Attributes\u003c\/th\u003e\n\u003cth\u003eZQ1616L-4 (Metric System Sizing)\u003c\/th\u003e\n\u003cth\u003eZQ1616L-4 (Imperial Equivalent Sizing)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShank Size (Height × Width)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 × 16 mm\u003c\/td\u003e\n\u003ctd\u003e5\/8\" × 5\/8\" (0.625\" × 0.625\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverall Tool Length (L)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 mm\u003c\/td\u003e\n\u003ctd\u003e3.937\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsert Type Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSP400 \/ SP 400 (4.0mm Width)\u003c\/td\u003e\n\u003ctd\u003eSP400 \/ SP 400 (0.157\" Width)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCutting Hand Orientation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLeft Hand (L) External\u003c\/td\u003e\n\u003ctd\u003eLeft Hand (L) External\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClamping Mechanism Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeavy Top-Lock Clamp Plate Assembly\u003c\/td\u003e\n\u003ctd\u003eHeavy Top-Lock Clamp Plate Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Parting Depth ($CDX$)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 mm\u003c\/td\u003e\n\u003ctd\u003e0.394\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"cnc-h3\"\u003eZQ1616L-4 Model Designation Breakdown\u003c\/h3\u003e\n\u003cdiv class=\"cnc-nomenclature-flex\"\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eZ\u003c\/strong\u003e - Brand Manufacturing Series Designation (Heavy-Duty Plunge \u0026amp; Cutoff Platform Layout)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eQ\u003c\/strong\u003e - Tool Application Platform (External Parting-Off and Deep Slotting Cutter Geometry)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003e1616\u003c\/strong\u003e - Shank Cross-Section Dimension (16mm Height × 16mm Width Square Tool Body)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003eL\u003c\/strong\u003e - Cutting Hand Feed Direction (Left Hand Style Orientation)\u003c\/div\u003e\n\u003cdiv class=\"cnc-nomenclature-char\"\u003e\n\u003cstrong\u003e4\u003c\/strong\u003e - Insert Cut Width Designation (Precision-Ground to Adapt 4.0mm \/ 0.157\" Wide Insert Matrices)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"cnc-h3\"\u003eRecommended Machining Parameters for SP400 Grooving \u0026amp; Precision Parting\u003c\/h3\u003e\n\u003cdiv class=\"cnc-table-wrapper\"\u003e\n\u003ctable class=\"cnc-data-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget Workpiece Material Group\u003c\/th\u003e\n\u003cth\u003eCutting Speed ($Vc$) Range\u003c\/th\u003e\n\u003cth\u003eRadial Plunge Feed Rate ($fn$) Range\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMild \u0026amp; Carbon Steels (AISI 1018 \/ 1045)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e110 - 180 m\/min (360 - 590 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.07 - 0.16 mm\/rev (0.0027\" - 0.0063\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlloy \/ Pre-Hardened Steels (AISI 4140 \/ 8620)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80 - 140 m\/min (262 - 459 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.05 - 0.12 mm\/rev (0.0020\" - 0.0047\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAustenitic Stainless Steels (SUS 304 \/ 316)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60 - 110 m\/min (196 - 360 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.04 - 0.10 mm\/rev (0.0016\" - 0.0039\" ipr)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-link-box\"\u003e⛓️ Optimize Edge Economy: \u003ca href=\"https:\/\/cnchome-beyond.com\/search?q=SP400\" target=\"_blank\" rel=\"noopener\"\u003eClick Here to Browse High-Performance BEYOND SP400 Precision Indexable Carbide Grooving \u0026amp; Parting Inserts\u003c\/a\u003e Engineered with Advanced Deep-Plunge Chipbreakers.\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e4. Applications \u0026amp; Core Industrial Scenarios\u003c\/h2\u003e\n\u003cp\u003eThe BEYOND ZQ1616L-4 toolholder is engineered for \u003cstrong\u003ePrecision Deep External Grooving\u003c\/strong\u003e, \u003cstrong\u003eHeavy-Duty Cutoff Operations\u003c\/strong\u003e, and \u003cstrong\u003eHigh-Feed Profiling Cycles\u003c\/strong\u003e on compact CNC turning centers, automatic lathes, Swiss-type setups, and standard turret blocks. Its rigid 4.0mm cutting width profile delivers exceptional structural support when parting off small-to-medium diameter solid bars, precision tubing, threaded fittings, and custom hydraulic couplers.\u003c\/p\u003e\n\u003ch2 class=\"cnc-h2\"\u003e5. Compatibility \u0026amp; Equipment Integration\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Lathe Turrets:\u003c\/strong\u003e Mounts directly into standard 16mm metric or 5\/8\" imperial square tool positions, quick-change tool blocks, and standard mini multi-station turrets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbide Insert Fitment:\u003c\/strong\u003e Tailored specifically for 4.0mm width SP400 indexable grooving\/parting inserts with matching prism seating configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Pressure Lubrication:\u003c\/strong\u003e Highly recommended for integration with external high-flow coolant nozzles to flood deep radial crevices and clear heavy swarf.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"cnc-h2\"\u003e6. Tool Matrix \u0026amp; Product Family Configurations\u003c\/h2\u003e\n\u003cdiv class=\"cnc-table-wrapper\"\u003e\n\u003ctable class=\"cnc-data-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTool Body Part Number\u003c\/th\u003e\n\u003cth\u003eShank Cross Section Dimensions\u003c\/th\u003e\n\u003cth\u003eCompatible Insert Sizing\u003c\/th\u003e\n\u003cth\u003ePrimary Machining Strengths\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZQ1616L-4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 × 16 mm (5\/8\" Square)\u003c\/td\u003e\n\u003ctd\u003eSP400 Only (4.0 mm)\u003c\/td\u003e\n\u003ctd\u003eProvides excellent structural stability and high-end chatter resistance for high-torque left-hand turret deep parting-off lines within confined work spaces.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e7. Why Choose Us \u0026amp; Professional Support\u003c\/h2\u003e\n\u003cp\u003eDeep external grooving and heavy parting-off cycles put immense localized bending stress on the cutter's support blade. Any minor toolholder flex or pocket wear can cause severe chatter marks, out-of-round slots, or immediate insert breakage under high loads. The BEYOND ZQ1616L-4 overcomes this through its standard 16mm forged alloy steel construction and precision-ground prism pocket. By locking the 4mm insert down with an aggressive top clamp plate, it eliminates high-load vibration harmonics and provides true straight tracking under optimal feed rates. This ensures mirror-like surface finishes and exact linear positioning on critical parts.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Perfect Rigidity for Small CNC Lathes\"\u003c\/strong\u003e\n\u003cp\u003eRunning the ZQ1616L-4 on our compact lathe for cutting off small steel axles. The 16mm shank fits beautifully into our tool block. Absolutely zero vibration or chatter using 4mm SP400 inserts. Highly recommended!\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eRobert H. | Texas, USA\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Hervorragende Leistung in kleinen Bauräumen\"\u003c\/strong\u003e\n\u003cp\u003eSehr kompakter und extrem stabiler 16mm Halter für die breite 4mm SP400 Wendeplatte. Perfekt für unseren linken Revolver. Selbst bei zähem Edelstahl bleibt das Werkzeug absolut vibrationsfrei.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eKlaus M. | Ruhr Valley, Germany\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Ottimo stelo da 16mm per canali profondi\"\u003c\/strong\u003e\n\u003cp\u003ePortautensile sinistro da 16mm molto robusto. Ottimo accoppiamento con inserti SP400 da 4mm. La stabilità del prisma evita movimenti laterali del tagliente, garantendo superfici perfette.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eStefano R. | Brescia, Italy\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"16mm角でもビビリなし、抜群のホールド力\"\u003c\/strong\u003e\n\u003cp\u003e小型CNC旋盤の突切り作業用に購入。16mmシャンクながら、4mm幅のSP400インサートを完璧に上部クランプで押さえ込んでくれます。高送り plunges でも刃先が逃げず、仕上がりが非常に綺麗です。\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eHiroshi T. | Yokohama, Japan\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-review-card\"\u003e\n\u003cdiv class=\"cnc-stars\"\u003e★★★★☆\u003c\/div\u003e\n\u003cstrong\u003e\"Excellent Quality Tool Body\"\u003c\/strong\u003e\n\u003cp\u003eThe build quality of this BEYOND cutoff shank is superb. The clamp plate applies very uniform pressure and doesn't loose torque during prolonged production runs. Has greatly improved our SP400 insert tool life.\u003c\/p\u003e\n\u003cdiv class=\"cnc-review-meta\"\u003eJames L. | Aberdeen, UK\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"cnc-h2\"\u003e8. AI-Style FAQ Section (Machinist Reference)\u003c\/h2\u003e\n\u003cdiv class=\"cnc-faq-item\"\u003e\n\u003cdiv class=\"cnc-faq-q\"\u003eQ1: Can I mount an SP200, SP300, or SP600 insert into this ZQ1616L-4 holder?\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-a\"\u003eA1: No. The pocket seat and precision-ground prism walls of this holder are configured exclusively for 4.0mm wide SP400 inserts. Inserting other sizes will deform the seat pocket jaw and destroy the toolholder structure immediately.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-item\"\u003e\n\u003cdiv class=\"cnc-faq-q\"\u003eQ2: What are the main benefits of a 16x16mm shank compared to smaller 12x12mm shanks?\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-a\"\u003eA2: Cross-sectional rigidity. The robust 16mm square body provides over 2.3 times the resistance to bending and twisting compared to a 12mm body, making it essential for deeply plunging high-tensile materials without causing severe chatter or deflection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-item\"\u003e\n\u003cdiv class=\"cnc-faq-q\"\u003eQ3: What causes the insert to chip on the corners during a radial entry plunge?\u003c\/div\u003e\n\u003cdiv class=\"cnc-faq-a\"\u003eA3: Corner chipping is usually caused by micro-chatter or setting the toolholder slightly off center height. Ensure the tool tip is aligned precisely to the lathe spindle center line ($±0.1\\text{mm}$).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cnc-dark-box\"\u003e\n\u003ch3\u003e⚙️ Grade Comparison, Equivalent Models, Troubleshooting \u0026amp; Workpiece Material Matrix\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eEquivalent Models Index:\u003c\/strong\u003e This industrial monolithic external left-hand heavy-duty grooving toolholder is a direct high-rigidity alternative to standard market codes, including: standard 16mm square shank cutoff blocks, and corresponding indexable deep grooving bodies matching 4.0mm wide SP400 insert footprints.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWorkpiece Material Matrix \u0026amp; Grade Comparison Tips:\u003c\/strong\u003e To optimize metal removal rates and achieve reliable chip breaking under heavy loads, pair this holder with the correct SP400 carbide insert grade for your material. For ISO P (Steels and Cast Steel), select multi-layer CVD TiAlN or thick Al2O3-coated inserts to resist crater wear and high heat. For ISO K (Cast Iron), use tough carbide grades with excellent abrasion resistance to counter the abrasive nature of gray iron. For ISO M (Stainless Steels), pair with sharp, highly polished PVD-coated inserts to prevent material adhesion and work-hardening.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTroubleshooting Heavy Plunge Deflection and Rough Wall Finish:\u003c\/strong\u003e If you notice tapered groove walls or rapid corner chipping during a deep radial plunge, check your tool center height immediately. Running even 0.1mm off-center alters your relief angles, leading to heavy friction on the tool flank or excessive tool load. Keep the prism seat clear of hard micro-chips, check the top clamp screws for thread wear, and ensure the SP400 insert is seated perfectly flush against the back locating wall to distribute cutting forces evenly down the massive 16mm steel shank.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BEYOND","offers":[{"title":"Default Title","offer_id":43641362055340,"sku":"ZQ1616L-4","price":25.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_ZQ1616L-4_indexable_cutting_pocket_seat_for_SP400_4mm_wide_carbide_inserts.jpg?v=1783151988","url":"https:\/\/cnchome-beyond.com\/products\/zq1616l-4-cnc-grooving-parting-tool-holder-beyond","provider":"CNCHome-Beyond","version":"1.0","type":"link"}