{"product_id":"beyond-s25s-sskcr12-boring-bar-holder","title":"BEYOND S25S-SSKCR12 Heavy Duty Boring Bar | 25mm CNC Lathe Internal Turning Tool Holder for SCMT 1204 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-SSKCR12 Boring Bar – 25mm Heavy Duty Steel Screw Locking 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 seated on the cutting head in our product imagery is for structural demonstration and mounting orientation purposes only. It is NOT included in the boring bar package. Please purchase your matching 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 25mm boring bar is best optimized for high metal removal rates and maximized chip thickness capability by utilizing larger 12mm square SCMT inserts within confined bores?\"\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eBEYOND S25S-SSKCR12\u003c\/strong\u003e is an industrial-grade \u003cstrong\u003eSolid Alloy Steel Right Hand Internal Turning Boring Bar\u003c\/strong\u003e engineered to deliver extreme cutting edge security within a versatile \u003cstrong\u003e25mm shank footprint\u003c\/strong\u003e. Featuring a \u003cstrong\u003e250mm total length\u003c\/strong\u003e, this specialized tool holder bridges the gap between mid-sized machine setups and heavy-duty roughing capacities. Unlike traditional 25mm boring bars that are restricted to thin 09-sized inserts, the S25S-SSKCR12 is meticulously pocket-milled to accept much larger and thicker \u003cstrong\u003eSCMT 1204 \/ SCGT 1204\u003c\/strong\u003e indexable square carbide inserts. This allows machinsts to run aggressive depths-of-cut (Ap) and high feed loads without risking sudden insert fractures.\u003c\/p\u003e\n\u003cp\u003eThe engineering breakthrough of this model centers on its unique pocket configuration. The SCMT 1204 insert features a rugged 4.76mm substrate thickness—a substantial upgrade over the 3.97mm thickness of 09T3 inserts. This added thickness absorbs massive thermal shocks and mechanical stresses during continuous roughing in tough alloy steels. Combined with a 75-degree approach lead angle, radial cutting forces are redirected axially back along the rigid 25mm steel shank, eliminating micro-deflection. When paired with positive-rake ground chipbreaker grooves, the setup ensures instantaneous chip breaking, turning hazardous long steel ribbons into tight, broken coils that eject smoothly from a minimum bore diameter of 32mm.\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\u003eHigh-Capacity SCMT 1204 Pocket:\u003c\/strong\u003e Pocket-engineered for thick 12mm edge length square inserts, granting unmatched cutting edge mass to handle severe scale and interrupted cuts easily.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInduction-Hardened Alloy Steel Shank:\u003c\/strong\u003e Quenched and tempered to optimal tensile thresholds to dampen structural vibrations during high-frequency deep-cavity turning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e75° Optimized Cutting Lead Angle:\u003c\/strong\u003e Converts push deflection into stable axial clamping load, maintaining strict dimensional linearity and preventing taper errors in internal steps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Profile Torx Screw Clamping:\u003c\/strong\u003e Utilizes strong M4.0 screw locking to maximize clear chip evacuation space inside tight cylinders, completely eliminating top-clamp chip nesting.\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\u003eAbsolute geometric clarity is required for accurate CNC tool offsets. Below is the precise international ISO classification breakdown for the \u003cstrong\u003eS25S-SSKCR12\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\u003eK\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\u003eR\u003c\/strong\u003eRight-Hand Cut\u003c\/div\u003e\n\u003cdiv class=\"beyond-code-letter\"\u003e\n\u003cstrong\u003e12\u003c\/strong\u003e12mm Edge Size\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 perfectly inside standard 1.00\" imperial split boring 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 versatile mid-to-long length format)\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 (Optimized clear entry for a 25mm bar running 12mm inserts)\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 1204xx \/ SCGT 1204xx\u003c\/td\u003e\n\u003ctd\u003eSCMT 431 \/ SCMT 432 \/ SCMT 433 (1\/2\" IC Square Size, 4.76mm Thick)\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\u003eM4.0 x 10.0\u003c\/td\u003e\n\u003ctd\u003eM4.0 x 0.3937 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\u003e120 - 200 m\/min (393 - 656 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\u003e70 - 140 m\/min (229 - 459 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.08 - 0.22 mm\/rev (0.0031 - 0.0086 IPR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCast Iron Grades (GG25, GGG40)\u003c\/td\u003e\n\u003ctd\u003e90 - 160 m\/min (295 - 524 SFM)\u003c\/td\u003e\n\u003ctd\u003e0.15 - 0.38 mm\/rev (0.0059 - 0.0150 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=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 1204 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 high-strength 12mm insert pocket combined with a nimble 25mm tool shank makes the S25S-SSKCR12 perfect for a wide range of internal operations:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfined Mid-Size Rough Boring:\u003c\/strong\u003e Ideal for machining internal diameters starting above 32mm where a thicker, more rigid insert is required to break through hardened crusts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Metal Removal Rate (MRR) Turning:\u003c\/strong\u003e Tailor-made for deep forward-spindle turning sequences where aggressive cutting depths must coexist with restricted clearances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupted Deep-Hole Cycles:\u003c\/strong\u003e Widely used for machining cross-drilled cylinders or internal keyways where heavy structural pounding normally fractures standard 09-sized carbide edges.\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 tool body locks firmly into industry-standard metric CNC lathe turrets, static VDI\/BMT tool block clamps, and linear gang-tool slides. For workshops operating on imperial standards, it adapts flawlessly inside standard 1.00-inch imperial split bushes. This boring bar is fully compatible with premium CNC turning center equipment, including Haas, Mazak, DN Solutions\/Doosan, Okuma, Mori Seiki, and automated multi-axis mill-turn cells.\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-SSKCR12 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 Structured with micro-hard TiAlN coatings. Optimized to stop built-up edges (BUE) on sticky materials like 304 stainless steel and high-temp titanium alloys.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBYM25 Grade (Premium CVD Dual-Coated):\u003c\/strong\u003e Built with thick multi-layer Al2O3 + TiN coating lines. The benchmark standard for continuous, high-speed internal roughing passes on carbon 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. Custom-engineered for high-speed internal profiling of abrasive grey and ductile cast iron parts.\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 manufacturing centers strictly on micro-geometric tolerances. The S25S-SSKCR12 boring bar undergoes rigorous multi-axis automated milling and specialized induction heat treatments. By holding our indexable pocket seats within an ultra-precise ±0.01mm limit, we eliminate carbide micro-movement under heavy pounding. This ensures exceptional tool predictability, preventing unexpected part scrap and reducing downtime across your machining 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\"Incredible solution for high-load roughing in 35mm bores\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eWe needed to rough out tough 4140 steel tubes. Normal 25mm bars with 09 inserts kept chipping because of the heavy chip load. This BEYOND bar with SCMT 1204 inserts completely solved our problem. The extra insert thickness lets us push 2.5mm depths-of-cut with absolute confidence.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Marcus T., Lead CNC Lathe Operator (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\"Hervorragende Steifigkeit und perfekte Plattensitzgenauigkeit\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eSehr klug konzipiert. Die Kombination aus einem 25mm Schaft und einer großen 12er Platte gibt enorme Stabilität beim Schruppen. Die M4 Schraube hält die Wendeplatte bombenfest. Keine Vibrationen im Sackloch.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Dieter K., Production Engineer (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 pesante, ideale per lavorazioni gravose\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eSolid steel shank layout. We run it inside a 1-inch split sleeve on our Haas lathe. It redirects forces axially so well that we noticed an immediate improvement in bore roundness across our production runs.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Stefano M., Workshop Manager (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\"25mmシャンクで12サイズチップが使えるのが素晴らしい\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003e鋳鉄製スリーブの内径荒加工に使用。09サイズのツールホルダーと比べて、ビビりの無さと刃先強度が明らかに違います。断続切削でもチップが欠けず、安心して送り速度を上げられます。\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Kenji S., CNC Cell Supervisor (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\"No more chip traps in deep blind bores\"\u003c\/strong\u003e\n\u003cp style=\"margin: 5px 0;\"\u003eThe screw locking design leaves the chip pocket entirely open. Running high-pressure coolant washes the heavy broken chips right out of the 40mm bore. Fantastic design by BEYOND.\u003c\/p\u003e\n\u003cdiv class=\"beyond-review-meta\"\u003e— Oliver P., Turner Specialist (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: Why choose an S25S-SSKCR12 boring bar over an S25S-SSKCR09 model?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: While both tool holders share a identical 25mm shank diameter, the \u003cstrong\u003eS25S-SSKCR12\u003c\/strong\u003e is custom-engineered to hold the larger \u003cstrong\u003eSCMT 1204 inserts\u003c\/strong\u003e. The 1204 inserts are significantly thicker (4.76mm vs 3.97mm for 09T3) and offer longer cutting edges, making this bar far superior for heavy-duty roughing, higher depth-of-cut limits, and high-impact material removal rates.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: What is the absolute minimum entry bore diameter for this tool body?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: The minimum operating bore diameter (D-min) is \u003cstrong\u003e32mm (1.2598 inches)\u003c\/strong\u003e. Running this tool holder inside a hole smaller than 32mm will cause the back relief heel of the right-handed head structure to rub against the internal walls of your component, ruining the surface finish and fracturing the insert.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-item\"\u003e\n\u003cdiv class=\"beyond-faq-q\"\u003eQ: Can I use imperial SCMT 432 inserts on this metric S25S-SSKCR12 tool body?\u003c\/div\u003e\n\u003cdiv class=\"beyond-faq-a\"\u003eA: Yes. The metric specification '12' refers to a 12.7mm cutting edge length, which is functionally identical to the 1\/2\" Inscribed Circle (IC) sizing format used for imperial \u003cstrong\u003eSCMT 43x\u003c\/strong\u003e inserts. Both naming systems share identical thickness and pocket mounting metrics, making them fully interchangeable.\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 While 25mm is a standard metric layout used widely across European and Asian production hubs, it serves as a direct, high-precision drop-in alternative to traditional 1.00-inch (1\") imperial boring bars in North American workshops when held within standard multi-size reduction sleeve blocks.\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 - High-Frequency Chatter \/ Poor Surface Finish:\u003c\/em\u003e Check that your tool nose center line matches the spindle centerline perfectly. For 25mm heavy configurations running large inserts, being even 0.15mm off-center radically changes the effective clearance angle. Also, make sure at least 3xD to 4xD length of the steel shank is clamped firmly in a high-accuracy split boring sleeve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eProblem - Long Stringy Chips \/ Workpiece Bird-Nesting:\u003c\/em\u003e Square SCMT 1204 inserts require sufficient feed pressure to activate their chipbreaker groove. If your material is stringing, increase the feed rate (f) slightly or choose a sharper, highly positive-ground chipbreaker configuration.\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":43618183479468,"sku":"S25S-SSKCR12","price":33.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_S25S-SSKCR12_right_hand_heavy_duty_boring_bar_25mm_alloy_steel_shank_for_SCMT120408_indexable_carbide_turning_inserts_heavy_metal_removal.jpg?v=1780883804","url":"https:\/\/cnchome-beyond.com\/products\/beyond-s25s-sskcr12-boring-bar-holder","provider":"CNCHome-Beyond","version":"1.0","type":"link"}