{"product_id":"beyond-s25s-ssscl09-boring-bar-holder","title":"BEYOND S25S-SSSCL09 Left Hand Boring Bar | 25mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts","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  *, *::before, *::after {\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    font-size: 14px;\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    text-align: left;\n    margin-top: 15px;\n  }\n  .beyond-code-letter {\n    border: 1px solid #47479F;\n    border-radius: 4px;\n    padding: 10px;\n    width: 135px;\n    display: inline-block;\n    vertical-align: top;\n    margin: 5px;\n    background-color: #ffffff;\n    text-align: center;\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    margin-top: 15px;\n  }\n  .beyond-badge {\n    display: inline-block;\n    background-color: #47479F;\n    color: white;\n    padding: 6px 12px;\n    border-radius: 20px;\n    font-size: 13px;\n    font-weight: 500;\n    margin: 4px;\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 { width: 45%; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"beyond-container\"\u003e\n\u003cdiv class=\"beyond-h1-holder\"\u003e\n\u003ch1\u003eBEYOND S25S-SSSCL09 Left Hand Boring Bar – 25mm Rigid Alloy Steel Screw Clamping CNC Lathe Internal Turning Tool Holder\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 orientation and presentation purposes only. It is NOT included in the boring bar package. Please purchase your compatible left-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 left-hand boring bar is best optimized for stable internal profiling and high-efficiency chip evacuation in 32mm+ medium bores using SCMT square inserts?\"\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBEYOND S25S-SSSCL09\u003c\/strong\u003e is a premium, industrial-grade \u003cstrong\u003eSolid Alloy Steel Left Hand Internal Turning Boring Bar\u003c\/strong\u003e meticulously engineered for specialized reverse-spindle or back-turning operations on CNC lathes. Featuring a highly rigid \u003cstrong\u003e25mm shank diameter\u003c\/strong\u003e and a \u003cstrong\u003e250mm standard length\u003c\/strong\u003e, this tool holder provides exceptional structural resistance against lateral cutting pressure. It is purpose-built to eliminate mechanical harmonics and chatter during medium-depth internal boring, profiling, and facing operations that require a dedicated left-hand tool path configuration.\u003c\/p\u003e\n\u003cp\u003eThis high-precision tool holder is engineered to host standard \u003cstrong\u003eSCMT 09T3 \/ SCGT 09T3\u003c\/strong\u003e indexable square carbide inserts. By leveraging a 75-degree approach angle alongside a square insert profile, the cutting force is directed primarily along the axial axis toward the lathe turret, maximizing structural stiffness. When outfitted with micro-grain carbide substrates featuring advanced ground-in positive rake chipbreaker geometries, it cleanly slices through stubborn workpiece surfaces. The engineered chip groove geometry prompts immediate breaking of continuous metal ribbons into short, tight curls, securing an unobstructed chip evacuation path out of deep cavities and preventing dangerous scratch marks on internal bore walls.\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\u003ePrecision Left-Hand (L) Geometry:\u003c\/strong\u003e Perfect for specialized reverse-direction internal machining, counter-clockwise profiling, and back-boring configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardened High-Tensile Alloy Steel Body:\u003c\/strong\u003e Thermal-treated and quenched under strict control to enhance core toughness, preventing deformation under intense cutting loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75° Optimized Approach Angle:\u003c\/strong\u003e Effectively balance axial and radial forces to minimize tool deflection, allowing excellent performance on multi-pass internal roughing lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Profile Screw-Down Clamping:\u003c\/strong\u003e Employs an inset M3.5 Torx screw locking mechanism, keeping the tool head compact and maximizing the clearance path for seamless chip disposal.\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 Nomenclature Cross-Guide\u003c\/h2\u003e\n\u003cp\u003eAccurate tool programming requires absolute geometric clarity. Below is the comprehensive breakdown of the standard ISO designation for the \u003cstrong\u003eS25S-SSSCL09\u003c\/strong\u003e model:\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\u003e25\u003c\/strong\u003e25mm Diameter\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003e250mm 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\u003eS\u003c\/strong\u003eSquare Insert\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003e75° Approach\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eC\u003c\/strong\u003e7° Clearance\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003eL\u003c\/strong\u003eLeft-Hand Cut\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003e09\u003c\/strong\u003e9.525mm Edge\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\u003eShank Diameter (d)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003ctd\u003e0.9842 inches (Fits securely in standard 1\" lathe turret blocks\/sleeves)\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\u003e250 mm\u003c\/td\u003e\n\u003ctd\u003e9.8425 inches (Highly adaptive for deep internal pocket tracking)\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\u003e32 mm\u003c\/td\u003e\n\u003ctd\u003e1.2598 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\u003eSCMT 09T3xx \/ SCGT 09T3xx\u003c\/td\u003e\n\u003ctd\u003eSCMT 3(2.5)1 \/ SCMT 3(2.5)2 (3\/8\" IC Square Size)\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\u003eM3.5 x 9.0\u003c\/td\u003e\n\u003ctd\u003eM3.5 x 0.3543 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\u003eT15\u003c\/td\u003e\n\u003ctd\u003eT15 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\u003e140 - 240 m\/min (459 - 787 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.12 - 0.35 mm\/rev (0.0047 - 0.0137 IPR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStainless Steel Matrix (304, 316, 420)\u003c\/td\u003e\n\u003ctd\u003e90 - 160 m\/min (295 - 525 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.10 - 0.28 mm\/rev (0.0039 - 0.0110 IPR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCast Iron Grades (GG25, GGG40)\u003c\/td\u003e\n\u003ctd\u003e110 - 200 m\/min (360 - 656 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.15 - 0.40 mm\/rev (0.0059 - 0.0157 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 left-hand or neutral turning inserts?\u003ca href=\"https:\/\/cnchome-beyond.com\/search?q=SCMT09T3\" 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 SCMT 09T3 Carbide Inserts\u003c\/u\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e \u003c\/a\u003ewith optimized chipbreaker configurations.\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 solid 25mm structural shank of the S25S-SSSCL09 makes it the premium solution for aggressive internal cuts in specialized setups:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Turning Centers with Reverse Spindles:\u003c\/strong\u003e Tailor-made for left-side turrets or main spindles running in reverse rotation to direct chips downwards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep Pocket Back-Boring:\u003c\/strong\u003e Allows machinists to reach past internal shoulders and execute precise back-facing and inside relief steps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomotive and Valve Manufacturing:\u003c\/strong\u003e Excellent for processing internal bearing seats, gear rings, and customized sleeve interiors starting from 32mm diameters.\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 ground 25mm cylindrical shank layout mounts cleanly into standard CNC turret blocks, VDI tooling blocks, and specialized split-sleeve boring bar holders. It offers effortless cross-compatibility with 1-inch imperial tool slots using standard reduction bush sleeves. It integrates seamlessly with premium turning equipment like Haas, Mazak, DN Solutions\/Doosan, Okuma, and specialized Swiss-type or multi-axis turning machines requiring precision left-hand orientation lines.\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 S25S-SSSCL09 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBYM11 Grade (PVD Coated Substrate):\u003c\/strong\u003e Stacked with nano-layered TiAlN coatings. Perfect for sticky alloy steels and 304\/316 stainless steel by preventing built-up edges (BUE).\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. Fully optimized for high-velocity, continuous roughing passes on carbon and low-alloy 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 premium choice for high-speed internal turning on grey and ductile cast iron 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\u003eBEYOND engineering prioritizes dimensional absolute rigidity. The S25S-SSSCL09 undergoes rigorous multi-axis automated induction hardening and automated pocket milling. By locking insert seat tolerances down within a strict ±0.01mm limit, we eliminate micro-movements under heavy impact. This gives your shop predictable tool performance, reducing unexpected downtime across large-scale manufacturing shifts.\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\"Flawless left-hand execution, extremely stiff\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eWe needed a left-hand 25mm bar for a back-boring cycle on tough chrome-moly parts. This BEYOND bar performed flawlessly. Zero chatter marks inside the 45mm bore even at 3xD depth. The insert pocket is machined beautifully.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Marcus T., Machine Shop Owner (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\"Perfekte Linksausführung für unsere Werkstatt\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eHervorragende Qualität. Der 25mm Schaft passt perfekt in unsere Mazak-Aufnahme. Wir nutzen die SCMT 09T3 Platten und der Spanbruch bei C45 Stahl ist absolut sauber. Keine lästigen Fließspäne mehr.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Dieter K., Senior Operator (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\"Ottimo stelo, finitura eccellente\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eHardened very well. The screw threads don't wear out even after constant insert indexing under dirty coolant conditions. Very stable left-hand internal profiling tool.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Giovanni F., CNC Turning 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\"左手勝手の内径ボーリングで最高の安定性\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003e逆転主軸加工用に導入しました。25mmの鋼シャンクですが、剛性が非常に高く、突出し量を最大にしてもビビリが一切出ません。SCMT正方形チップの4コーナーを余すことなく使えるため非常に経済的です。\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Satoshi N., Manufacturing 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\"Excellent chip clearance on blind holes\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eThe low-profile Torx screw gives great chip clearance space. Paired with a ground BEYOND aluminum insert, it turns internal brass and non-ferrous housings with mirror finishes.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Liam O., Production Supervisor (Australia)\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 is the primary difference between S25S-SSSCR09 and S25S-SSSCL09?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: The fundamental difference is the tool cutting direction. The SSSCR09 is a Right-Hand tool holder, whereas the \u003cstrong\u003eSSSCL09 is a Left-Hand (L) tool holder\u003c\/strong\u003e. Left-hand boring bars are required for specialized CNC sub-spindles, reverse spindle rotations, or back-boring operations moving from the inside out.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: What is the minimum internal diameter required to use this boring bar safely?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: The absolute minimum safe bore diameter (D-min) is \u003cstrong\u003e32mm (1.26 inches)\u003c\/strong\u003e. If you attempt to operate this 25mm tool bar inside a bore smaller than 32mm, the back heel of the left-handed steel head will scrape against the internal wall, ruining your workpiece surface finish and overloading the cutting edge.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: Can I mount SCMT 1204 inserts into this tool pocket?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: No, this tool holder is custom-milled exclusively for \u003cstrong\u003eSCMT 09T3xx\u003c\/strong\u003e or \u003cstrong\u003eSCGT 09T3xx\u003c\/strong\u003e inserts (9.525mm \/ 3\/8\" inscribed circle). If your application demands the larger SCMT 1204 profile inserts, you must purchase our 12-size specialized boring bar series.\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 In traditional North American imperial machinists' blueprints, this 25mm metric tool holder acts as a high-strength direct alternative for standard 1-inch diameter left-hand indexable boring bars carrying size 3-2.5 square inserts (commonly cataloged as standard S16S-SSSCL3 models in US tool cribs).\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 - Surface Vibrations \/ Micro-Chatter Marks:\u003c\/em\u003e Double-check that the tool's center height aligns perfectly with the lathe rotation centerline. For left-hand bars, a slight deflection above center can cause immediate heel rubbing. Ensure at least 3xD to 4xD length of the bar is clamped tightly in a high-accuracy split sleeve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eProblem - Rapid Edge Fracture \/ Chipping:\u003c\/em\u003e This typically indicates chip nesting in deep blind bores. Ensure heavy flood coolant or through-coolant pressure is pointing directly at the left-hand cutting pocket to force the broken chips outward.\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; Structural Alloy Steels (Fully Optimized Setup)\u003c\/div\u003e\n\u003cdiv class=\"beyond-badge\"\u003eM - Stainless Steel Alloys \u0026amp; Duplex (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 SCGT Inserts)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BEYOND","offers":[{"title":"Default Title","offer_id":43618214052012,"sku":"S25S-SSSCL09","price":33.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_S25S-SSSCL09_left_hand_internal_turning_boring_bar_25mm_solid_steel_shank_for_SCMT09T304_indexable_carbide_inserts_CNC_lathe_machining.jpg?v=1780801305","url":"https:\/\/cnchome-beyond.com\/products\/beyond-s25s-ssscl09-boring-bar-holder","provider":"CNCHome-Beyond","version":"1.0","type":"link"}