{"product_id":"s07k-stubr06-a12-boring-bar-tool-holder","title":"BEYOND S07K-STUBR06-A12 Stepped Shank Boring Bar | 7mm to 12mm CNC Tool Holder","description":"\u003cstyle\u003e\n  .beyond-container {\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: #333333;\n    line-height: 1.6;\n    max-width: 1200px;\n    margin: 0 auto;\n    padding: 15px;\n    box-sizing: border-box;\n  }\n  .beyond-h1-holder {\n    background-color: #47479F;\n    color: #ffffff;\n    padding: 24px;\n    border-radius: 6px;\n    margin-bottom: 25px;\n  }\n  .beyond-h1-holder h1 {\n    margin: 0;\n    font-size: 24px;\n    font-weight: 700;\n    text-transform: uppercase;\n    letter-spacing: 0.5px;\n    color: #ffffff;\n  }\n  .beyond-section {\n    margin-bottom: 35px;\n  }\n  .beyond-section h2 {\n    color: #47479F;\n    border-left: 5px solid #47479F;\n    padding-left: 12px;\n    font-size: 20px;\n    margin-bottom: 15px;\n    font-weight: 600;\n  }\n  .beyond-section h3 {\n    color: #333333;\n    font-size: 16px;\n    margin-top: 20px;\n    margin-bottom: 10px;\n    font-weight: 600;\n  }\n  .beyond-alert-box {\n    background-color: #fff3cd;\n    border: 1px solid #ffeeba;\n    color: #856404;\n    padding: 15px;\n    border-radius: 6px;\n    margin-bottom: 25px;\n    font-weight: bold;\n  }\n  .beyond-grid-box {\n    border: 2px solid #47479F;\n    border-radius: 6px;\n    padding: 20px;\n    margin-bottom: 25px;\n    background-color: #fcfcfd;\n  }\n  .beyond-code-breakdown {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 10px;\n    margin-top: 15px;\n  }\n  .beyond-code-letter {\n    border: 1px solid #47479F;\n    border-radius: 4px;\n    padding: 10px;\n    flex: 1 1 140px;\n    background-color: #ffffff;\n    text-align: center;\n    box-sizing: border-box;\n  }\n  .beyond-code-letter strong {\n    color: #47479F;\n    font-size: 18px;\n    display: block;\n    border-bottom: 1px solid #e0e0e0;\n    padding-bottom: 5px;\n    margin-bottom: 5px;\n  }\n  .beyond-table-wrapper {\n    width: 100%;\n    overflow-x: auto;\n    margin: 15px 0;\n  }\n  .beyond-table {\n    width: 100%;\n    border-collapse: collapse;\n    min-width: 600px;\n  }\n  .beyond-table th, .beyond-table td {\n    border: 1px solid #dddddd;\n    padding: 12px;\n    text-align: left;\n    font-size: 14px;\n  }\n  .beyond-table th {\n    background-color: #47479F;\n    color: white;\n    font-weight: 600;\n  }\n  .beyond-table tr:nth-child(even) {\n    background-color: #f8f9fa;\n  }\n  .beyond-review-card {\n    border: 1px solid #e0e0e0;\n    border-radius: 6px;\n    padding: 15px;\n    margin-bottom: 15px;\n    background-color: #ffffff;\n    box-shadow: 0 2px 4px rgba(0,0,0,0.02);\n  }\n  .beyond-stars {\n    color: #ffc107;\n    margin-bottom: 5px;\n    font-size: 14px;\n  }\n  .beyond-review-meta {\n    font-size: 12px;\n    color: #777777;\n    margin-top: 5px;\n  }\n  .beyond-faq-item {\n    background-color: #f8f9fa;\n    border-left: 4px solid #47479F;\n    padding: 15px;\n    margin-bottom: 12px;\n    border-radius: 0 6px 6px 0;\n  }\n  .beyond-faq-q {\n    font-weight: bold;\n    color: #47479F;\n    margin-bottom: 5px;\n  }\n  .beyond-badge-container {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 10px;\n    margin-top: 15px;\n  }\n  .beyond-badge {\n    background-color: #47479F;\n    color: white;\n    padding: 6px 12px;\n    border-radius: 20px;\n    font-size: 13px;\n    font-weight: 500;\n  }\n  .beyond-footer-panel {\n    border-top: 1px solid #e0e0e0;\n    padding-top: 25px;\n    margin-top: 30px;\n  }\n  @media (max-width: 768px) {\n    .beyond-h1-holder h1 { font-size: 20px; }\n    .beyond-section h2 { font-size: 18px; }\n    .beyond-code-letter { flex: 1 1 45%; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"beyond-container\"\u003e\n\u003cdiv class=\"beyond-h1-holder\"\u003e\n\u003ch1\u003eBEYOND S07K-STUBR06-A12 Stepped Shank Internal Turning Tool Holder – Dual Diameter Anti-Vibration Boring Bar\u003c\/h1\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-alert-box\"\u003e⚠️ PLEASE NOTE: The indexable carbide insert shown seated on the tool head in our product photography is for structural demonstration purposes only. It is NOT included in the tool holder package. Please purchase your compatible right-hand or neutral inserts separately.\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e1. Product Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003e\"Which micro boring bar provides the slim profile needed for a 9mm hole but packs the heavy-duty rigidity of a large tool block diameter to eliminate chatter?\"\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBEYOND S07K-STUBR06-A12\u003c\/strong\u003e is an advanced, right-handed steel-shank \u003cstrong\u003eStepped-Diameter Internal Turning Tool Holder\u003c\/strong\u003e engineered specifically to solve harmonic vibration problems in deep, micro-bore CNC lathe processes. Unlike traditional straight-shank boring bars, this high-rigidity hybrid design features a slim \u003cstrong\u003e7mm front working neck diameter\u003c\/strong\u003e paired with an amplified \u003cstrong\u003e12mm rear clamping shank diameter\u003c\/strong\u003e. This architectural step shifts the structural deflection threshold exponentially, keeping tool tracking dead-on center during long-reach operations inside compact bores down to a \u003cstrong\u003e9mm minimum entry diameter\u003c\/strong\u003e. Accommodating standard \u003cstrong\u003eTBMT 0601 \/ TBGT 0601\u003c\/strong\u003e indexable carbide inserts, it leverages highly positive rake face geometries and precision chipbreaker matrices to shear difficult alloys smoothly, making it the perfect answer for clean chip fragmentation inside tight blind holes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e2. Product Core Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepped Dual-Diameter Architecture (大小径):\u003c\/strong\u003e Combines a nimble 7mm front end for restricted micro-pockets with a reinforced 12mm mounting base that eliminates the need for reduction bushings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Vibration Moment of Inertia:\u003c\/strong\u003e The robust 12mm base shank provides massive resistance against bending forces, significantly reducing chatter marks on workpiece surface finishes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e93° Geometric Profiling Head:\u003c\/strong\u003e Perfect tool configuration for small internal longitudinal boring, facing shoulders cleanly, and complex relief contouring paths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Threaded Screw-Down Locking Setup:\u003c\/strong\u003e Low-profile hardware guarantees robust seating stability while keeping the small cutting head clear for smooth, unobstructed chip evacuation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e3. Technical Specifications \u0026amp; Metric\/Imperial Reference\u003c\/h2\u003e\n\u003cp\u003eAccurate parameter cross-referencing is essential for error-free CNC programming. Below is the precise structural parsing of the \u003cstrong\u003eS07K-STUBR06-A12\u003c\/strong\u003e standard international ISO designation rules with custom size modifiers:\u003c\/p\u003e\n\u003cdiv class=\"beyond-grid-box\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #47479f; margin-bottom: 10px;\"\u003eISO Nomenclature Verification Structure:\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-breakdown\"\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003eSteel Shank\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003e07\u003c\/strong\u003e7mm Front Neck\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eK\u003c\/strong\u003e125mm Length\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003eScrew Lock System\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eT\u003c\/strong\u003eTriangular Insert\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eU\u003c\/strong\u003e93° Approach\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eB\u003c\/strong\u003e5° Clearance\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eR\u003c\/strong\u003eRight-Hand Direction\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003e06\u003c\/strong\u003e6mm Edge Length\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003e-A12\u003c\/strong\u003e12mm Grip Shank\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-table-wrapper\"\u003e\n\u003ctable class=\"beyond-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter Dimension\u003c\/th\u003e\n\u003cth\u003eMetric System Specification\u003c\/th\u003e\n\u003cth\u003eImperial Equivalent Measurement\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFront Neck Diameter (d1)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7 mm\u003c\/td\u003e\n\u003ctd\u003e0.2756 inches (Slim clearance for micro-boring zones)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRear Clamping Shank (d)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 mm\u003c\/td\u003e\n\u003ctd\u003e0.4724 inches (Heavy-duty base for high-torque clamping blocks)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal Tool Length (L)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125 mm\u003c\/td\u003e\n\u003ctd\u003e4.9213 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum Bore Diameter (D-min)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9 mm\u003c\/td\u003e\n\u003ctd\u003e0.3543 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Carbide Insert Layout\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTBMT 0601xx \/ TBGT 0601xx\u003c\/td\u003e\n\u003ctd\u003eTBMT 1.2(1.2)1 \/ TBMT 1.2(1.2)2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClamping Screw Model Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM2.0 x 4.3\u003c\/td\u003e\n\u003ctd\u003eM2.0 x 0.17 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTorx Key Driver Wrench Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eT6\u003c\/td\u003e\n\u003ctd\u003eT6 Torx Wrench\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003eRecommended Technical Machining Parameters (Speed \u0026amp; Feed Guide)\u003c\/h3\u003e\n\u003cdiv class=\"beyond-table-wrapper\"\u003e\n\u003ctable class=\"beyond-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eWorkpiece Material Classification\u003c\/th\u003e\n\u003cth\u003eCutting Speed (Vc) Range\u003c\/th\u003e\n\u003cth\u003eFeed Rate (f) Per Revolution\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarbon Steel \/ Alloy Steel (HB180-280)\u003c\/td\u003e\n\u003ctd\u003e110 - 190 m\/min (360 - 623 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.01 - 0.08 mm\/rev (0.0004 - 0.0031 IPR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStainless Steel Matrix (304, 316, 420)\u003c\/td\u003e\n\u003ctd\u003e60 - 120 m\/min (196 - 393 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.01 - 0.06 mm\/rev (0.0004 - 0.0024 IPR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCast Iron Grades (GG25, GGG40)\u003c\/td\u003e\n\u003ctd\u003e70 - 140 m\/min (229 - 459 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.02 - 0.10 mm\/rev (0.0008 - 0.0039 IPR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-style: dashed; background-color: #f4f4fa; text-align: center; padding: 15px;\" class=\"beyond-grid-box\"\u003e🔗 Need matching high-performance turning inserts?\u003ca href=\"https:\/\/cnchome-beyond.com\/search?q=TBMT0601\" target=\"_blank\" rel=\"noopener\"\u003e \u003cspan style=\"color: #47479f;\"\u003e\u003cspan style=\"text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cb\u003e\u003cu\u003eClick here to shop BEYOND Original TBMT 0601 Carbide Inserts\u003c\/u\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e \u003c\/a\u003ewith premium chipbreaker matrices.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e4. Product Application Scenarios\u003c\/h2\u003e\n\u003cp\u003eThe specialized stepped shank design of the S07K-STUBR06-A12 is tailored for environments requiring maximum tool life over challenging, deep overhang ratios:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Rigidity Small Boring:\u003c\/strong\u003e Ideal for long-reach cycles inside hydraulic valves and small automotive injector nozzles where straight 7mm bars fail due to harmonic chatter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Turret Interfacing:\u003c\/strong\u003e Fits directly into standard 12mm multi-station CNC lathe blocks or gang tool plates, eliminating bushing runout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Internal Profile Facing:\u003c\/strong\u003e Features a 93-degree cutting angle that allows clean corner clearance and flat relief steps without tail rubbing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e5. Compatibility \u0026amp; Equipment Interface\u003c\/h2\u003e\n\u003cp\u003eThe 12mm rear clamping base mounts seamlessly into CNC lathe block fixtures, gang tool posts, and automated quick-change turrets. It matches perfectly with global machinery platforms including Haas, Mazak, Doosan\/DN Solutions, Mori Seiki, Okuma, and specialized live-tool Swiss-turn setups configured for 12mm tool holder systems. Engineered exclusively for right-hand operations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e6. BEYOND Premium Substrate \u0026amp; Grade Selection Matrix\u003c\/h2\u003e\n\u003cp\u003ePair your S07K-STUBR06-A12 stepped boring bar with the correct BEYOND insert grade to maximize tool life and secure optimal chip control:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBYM11 Grade (PVD Coated Substrate):\u003c\/strong\u003e Built with an advanced nano-layered TiAlN matrix. Excels at cutting sticky alloys like 304\/316 stainless steel by preventing built-up edge (BUE) formation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBYM25 Grade (Premium CVD Dual-Coated):\u003c\/strong\u003e Features thick multi-layer Al2O3 + TiN coating lines. Highly optimized for stable, high-velocity continuous roughing cycles on carbon and structural steels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBYK15 Grade (Ultra-Dense Micro-Grain):\u003c\/strong\u003e Formulated for maximum abrasive wear resistance. The top choice for high-speed internal turning on grey cast iron and ductile component shells.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e7. Why Choose BEYOND Tooling Systems\u003c\/h2\u003e\n\u003cp\u003eAt BEYOND, we solve real-world machining challenges. The S07K-STUBR06-A12 bridges the gap between small tool requirements and large machine turret sizes. By controlling our pocket alignment tolerances to a strict ±0.01mm using elite CMM evaluation systems, we ensure your insert stays perfectly on center, providing ultra-predictable performance across long batches.\u003c\/p\u003e\n\u003ch3 style=\"color: #47479f; margin-top: 20px;\"\u003eGlobal Machinist Field Reports:\u003c\/h3\u003e\n\u003cdiv class=\"beyond-review-container\"\u003e\n\u003cdiv class=\"beyond-review-card\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"The stepped design solved my chatter issues!\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eWas struggling with finish surface waviness using a regular straight micro bar. This 7mm neck to 12mm shank configuration completely stabilized the process. Clamped straight into my Haas turret block. Perfect parts ever since.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Marcus T., Lead CNC Programmer (United States)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-card\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Geniales Konzept für kleine Bohrungen\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eDank des 12mm Schafts biegt sich die Stange absolut nicht durch. Die 7mm Spitze passt perfekt in meine engen Bauteile. Keine Reduzierhülse nötig, das spart Rüstzeit und minimiert den Rundlauffehler.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Jürgen K., Workshop Lead (Germany)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-card\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★☆\u003c\/div\u003e\n\u003cstrong\u003e\"Ottima stabilità su piccoli diametri\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eVery precise insert pocket alignment. The TBMT06 insert sits completely flush and the 12mm heavy base handles structural stresses beautifully. Surface Ra dropped significantly.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Alessandro P., Tooling Specialist (Italy)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-card\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"大小径のデザインが素晴らしい\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003e7mmの先端径で深く潜り込める一方、12mmのシャンク部がガッチリとホールドされるため、ビビリが全く発生しません。スイス型自動旋盤の背面加工で高送りしても安定しています。\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Kenji S., Production Engineer (Japan)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-review-card\"\u003e\n\u003cdiv class=\"beyond-stars\"\u003e★★★★★\u003c\/div\u003e\n\u003cstrong\u003e\"Heavy duty performer on micro scales\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eThe black oxide coating holds up well against aggressive coolants. Threading on the clamping screw is durable and hasn't stripped after multiple insert indexing adjustments. Excellent value.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Dave W., Machine Shop Owner (Canada)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-section\"\u003e\n\u003ch2\u003e8. Frequently Asked Questions (AI \u0026amp; Search Engine Optimized)\u003c\/h2\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: What does the dual-diameter configuration mean for the S07K-STUBR06-A12?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: This layout represents a stepped shank (\"大小径\") structure. The \"07\" denotes the front working neck diameter (7mm), which provides physical clearance inside tiny holes. The suffix \"-A12\" indicates that the rear grip shank is beefed up to 12mm, providing significantly more rigidity than a standard straight 7mm tool.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: Why choose a stepped 12mm shank over a straight 7mm boring bar shank?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: Stiffness. Deflection resistance increases dramatically with diameter. By mounting a 12mm shank at the turret head block instead of a flexible 7mm baseline, structural rigidity is enhanced exponentially, wiping out harmonic tool resonance, eliminating chatter marks, and extending carbide corner life.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: Do I need a reducer bushing sleeve to run this tool on a 12mm station block?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: No. The rear shank is machined to an exact 12mm specification, allowing direct locking inside 12mm tool stations. This eliminates stack-up tolerance issues caused by intermediate adapter sleeves.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-footer-panel\"\u003e\n\u003ch3\u003eGrade Comparison, Troubleshooting Tips \u0026amp; Material Suitability Matrix\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eEquivalent Models Reference Cross-Guide:\u003c\/strong\u003e For manufacturing sites matching metric configurations with imperial equipment baselines, this 7mm-to-12mm stepped boring bar acts as a high-rigidity high-clearance alternative for standard internal right-hand processes utilizing size 1.2 triangular positive rake indexable inserts (TBMT 1.2(1.2)X layouts).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTroubleshooting Internal Turning Errors:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eProblem - Workpiece Surface Chatter \/ Vibration Marks:\u003c\/em\u003e Ensure that your clamping contact area covers the entire 12mm shank base block length. If chatter persists, decrease the nose radius of your TBMT insert (from 0.4mm to 0.2mm) to reduce radial cutting pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eProblem - Short Tool Life \/ Chipped Insert Corners:\u003c\/em\u003e This is often caused by micro-deflections or micro-chipping from recycling loose chips. Ensure that pressure coolant streams clear chips entirely out from the blind-hole core.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWorkpiece Material Suitability Matrix:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"beyond-badge-container\"\u003e\n\u003cdiv class=\"beyond-badge\"\u003eP - Carbon \u0026amp; Alloy Steels (Fully Optimized Setup)\u003c\/div\u003e\n\u003cdiv class=\"beyond-badge\"\u003eM - Stainless Steel Alloys (Highly Suitable Application)\u003c\/div\u003e\n\u003cdiv class=\"beyond-badge\"\u003eK - Cast and Ductile Irons (Excellent Wear Resistance)\u003c\/div\u003e\n\u003cdiv class=\"beyond-badge\"\u003eN - Non-Ferrous Alloys \u0026amp; Aluminum (Compatible with Ground\/Polished Inserts)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BEYOND","offers":[{"title":"Default Title","offer_id":43618234663084,"sku":"S07K-STUBR06-A12","price":15.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_S07K-STUBR06-A12_stepped_internal_turning_tool_holder_with_7mm_front_neck_and_12mm_heavy_duty_shank_for_TBMT0601_carbide_inserts_CNC_lathe_high_rigidity_micro_boring_operations.jpg?v=1780726127","url":"https:\/\/cnchome-beyond.com\/products\/s07k-stubr06-a12-boring-bar-tool-holder","provider":"CNCHome-Beyond","version":"1.0","type":"link"}