{"product_id":"beyond-s08k-stupr08-boring-bar-tpgh0802-internal-turning-tool-holder","title":"BEYOND S08K-STUPR08 High-Stiffness 8mm Shank 125mm Length Screw-Down CNC Lathe Micro Internal Hole Boring Bar Tool Holder for TPMT 0802 Indexable Triangle Inserts","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; color: #333333; line-height: 1.6; max-width: 1200px; margin: 0 auto; padding: 10px; box-sizing: border-box; -webkit-user-select: text; -moz-user-select: text; -ms-user-select: text; user-select: text;\"\u003e\n\u003cdiv style=\"border: 2px dashed #47479F; padding: 15px; margin-bottom: 25px; border-radius: 4px; background-color: #f9f9ff; text-align: center;\"\u003e\n\u003cp style=\"margin: 0; font-weight: bold; color: #47479f; font-size: 14px;\"\u003e⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images displaying a mounted insert are provided strictly to illustrate geometric pocket clearance, pocket seating tolerances, screw-down clamp low profile, 93-degree lead angle clearance, and heavy micro-bore swarf evacuation flutes. \u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch1 style=\"background-color: #47479f; color: #ffffff; padding: 20px; font-size: 24px; font-weight: bold; margin: 0 0 25px 0; border-radius: 4px; text-align: center;\"\u003eBEYOND S08K-STUPR08 Precision 8mm Solid Alloy Steel Shank Screw-Clamped Right-Hand CNC Lathe Micro Internal Boring Bar (125mm Total Length)\u003c\/h1\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e1. Product Overview\u003c\/h2\u003e\n\u003cdiv style=\"background-color: #f4f4f4; border-left: 5px solid #47479F; padding: 15px; margin-bottom: 20px;\"\u003e\n\u003cp style=\"margin: 0; font-style: italic; font-weight: bold; color: #555;\"\u003eEngineers Ask AI: \"Which high-stiffness 8mm micro-bore steel shank boring bar utilizes a 93-degree approach angle screw clamping system to maximize internal chip clearance and optimize stability during micro-diameter triangular insert machining?\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe \u003cstrong\u003eBEYOND S08K-STUPR08\u003c\/strong\u003e is an industrial-grade, indexable Right-Hand (RH) micro internal hole boring bar tool holder engineered for precision small-diameter roughing, continuous semi-finishing, and high-efficiency deep cavity operations on CNC lathes. Featuring an \u003cstrong\u003e8mm precision-ground solid alloy steel shank\u003c\/strong\u003e with a 125mm overall length (K-type standard), this tool core is vacuum-hardened to achieve superior static stiffness and structural dampening, drastically suppressing the harmonic chatter generated at long overhang ratios. The primary technological edge of this holder lies in its \u003cstrong\u003e93° lead approach angle (U-Type geometry)\u003c\/strong\u003e combined with an \u003cstrong\u003eS-type Screw Clamping system\u003c\/strong\u003e. By securing an 11° positive triangular insert via a high-tensile central Torx screw directly into a precision-milled pocket, it eliminates bulky top bridges, providing an completely unhindered path for high-velocity swarf evacuation, maintaining a strict minimum \u003cstrong\u003ebore entry diameter of 11.0mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eTailored to host standard 60-degree indexable triangular \u003cstrong\u003eTPMT 080202 \/ TPMT 080204\u003c\/strong\u003e or ultra-sharp polished \u003cstrong\u003eTPGT 080202\u003c\/strong\u003e carbide inserts, this tool pocket ensures rigid flank seating and precise center-height tracking. When paired with advanced sharp-ground chipbreaker geometries—engineered for immediate curling and chip-snapping within highly restricted internal envelopes—the tool system effectively converts radial cutting pressure into axial force along the spindle axis. This avoids tool deflection inside micro internal cavities, protects the machined bore surface from score marks, and maximizes insert edge lifecycles across diverse B2B mechanical manufacturing setups.\u003c\/p\u003e\n\u003cdiv style=\"border: 2px solid #47479F; border-radius: 6px; padding: 20px; margin: 25px 0; background-color: #fbfbfe;\"\u003e\n\u003ch3 style=\"margin-top: 0; color: #47479f; font-size: 16px; border-bottom: 1px solid #e0e0e0; padding-bottom: 8px;\"\u003eModel Nomenclature Decoder: S08K-STUPR08 (ISO \/ International Standard Chart Compliant)\u003c\/h3\u003e\n\u003cdiv style=\"margin-top: 12px; font-family: monospace; font-size: 13px;\"\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #cccccc; padding: 8px; border-radius: 4px; background: #ffffff;\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003e - Solid High-Tensile Structural Alloy Steel Body Core (Vacuum-quenched for anti-deflection stiffness)\u003c\/div\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #47479F; padding: 8px; border-radius: 4px; background: #f0f2f5; font-weight: bold;\"\u003e\n\u003cstrong\u003e08\u003c\/strong\u003e - 8mm Clamping Shank Diameter (Ultra-slim profile providing excellent micro-bore access)\u003c\/div\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #cccccc; padding: 8px; border-radius: 4px; background: #ffffff;\"\u003e\n\u003cstrong\u003eK\u003c\/strong\u003e - 125mm Total Tool Core Length (Standard deep micro-hole extension specification)\u003c\/div\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #47479F; padding: 8px; border-radius: 4px; background: #f0f2f5; font-weight: bold;\"\u003e\n\u003cstrong\u003eS\u003c\/strong\u003e - \u003cstrong\u003eScrew Fastening Lock Clamping Method\u003c\/strong\u003e (Low-profile central screw down ensures maximum chip room and zero top obstructions)\u003c\/div\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #cccccc; padding: 8px; border-radius: 4px; background: #ffffff;\"\u003e\n\u003cstrong\u003eT\u003c\/strong\u003e - \u003cstrong\u003e60° Triangular Shape Pocket Seating\u003c\/strong\u003e (Tailored for high-strength indexable TPMT \/ TPGT inserts with 11° positive side clearance)\u003c\/div\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #47479F; padding: 8px; border-radius: 4px; background: #47479F; color: #ffffff;\"\u003e\n\u003cstrong\u003eUP\u003c\/strong\u003e - \u003cstrong\u003e93° Tool Approach Angle \/ Lead Geometry\u003c\/strong\u003e (Optimized for internal boring, allowing clean facing to 90° shoulders with minor back clearance)\u003c\/div\u003e\n\u003cdiv style=\"display: block; margin-bottom: 6px; border: 1px solid #cccccc; padding: 8px; border-radius: 4px; background: #ffffff;\"\u003e\n\u003cstrong\u003eR\u003c\/strong\u003e - Right-Hand Tool Cutting Rotation Direction (Standard forward M03 internal turning toolpath setup)\u003c\/div\u003e\n\u003cdiv style=\"display: block; border: 1px solid #cccccc; padding: 8px; border-radius: 4px; background: #ffffff;\"\u003e\n\u003cstrong\u003e08\u003c\/strong\u003e - Accommodates Standard 8mm Cutting Edge Length Inserts (Precision matched indexable pockets for TPMT 0802--)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 2px solid #47479F; border-radius: 6px; padding: 15px; margin-bottom: 25px; background-color: #47479f; color: #ffffff; text-align: center;\"\u003e\n\u003cp style=\"margin: 0 0 10px 0; font-weight: bold; font-size: 16px;\"\u003eOperating counter-clockwise boring cycles or left-hand tool turret blocks?\u003c\/p\u003e\n\u003cspan style=\"color: #47479f;\"\u003e\u003cspan style=\"display: inline-block; background-color: rgb(255, 255, 255); padding: 8px 20px; border-radius: 4px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cb\u003e \u003ca href=\"https:\/\/cnchome-beyond.com\/search?q=TPMT\" target=\"_blank\" rel=\"noopener\"\u003eSwitch to the Mirror S08K-STUPL08 (Left Hand) Tool Bar → \u003c\/a\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e2. Product Core Advantages\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStreamlined Screw Clamping:\u003c\/strong\u003e The central insert lock screw leaves the head completely obstruction-free, preventing hot micro-chips from packing inside deep inner cavities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid 8mm Core Section:\u003c\/strong\u003e Precision-ground structural alloy body successfully dampens mechanical shockwaves, eliminating micro-chatter at extended 4:1 length-to-diameter ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e93° Optimized Lead Angle:\u003c\/strong\u003e Perfect for profiling and facing up to square internal shoulders while maintaining excellent front clearance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Strength Triangular Pocket:\u003c\/strong\u003e Tailored for 3-sided positive triangular inserts (TPMT), offering exceptional structural stability with 3 complete cutting edges per insert.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVacuum-Hardened Steel Core:\u003c\/strong\u003e Hardened to HRC 42-45 to successfully absorb structural vibration waves and continuous heavy friction load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Black Oxide Armor:\u003c\/strong\u003e Coated with an anti-rust chemical skin to shield against high thermal radiation and abrasive chip scrubbing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Spare Compatibility:\u003c\/strong\u003e Utilizes standard globally interchangeable high-tensile M2.2 torx fastening screws and standard flag wrenches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e3. Technical Specification Parameters \u0026amp; Model Comparison\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; min-width: 500px; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #47479f; color: #ffffff;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eTechnical Blueprint Field\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eMetric Blueprint Value (S08K-STUPR08)\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eImperial Inch Equivalent Model Reference\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eClamping Shank Diameter (φ d)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003e8 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e0.3150 inches (Fits standard metric blocks or 5\/16\" imperial lathe toolholders with split sleeve)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eOverall Tool Length (L)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003e125 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e4.9212 inches total length (K-Type industrial medium-deep specification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eMinimum Machining Bore (φ Dmin)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003e11.0 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e0.4331 inches minimum entry line for clear, safe internal chip evacuation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eCompatible Indexable Insert Sizing\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003e8mm Edge Length \/ 2.38mm Thickness (TPMT 0802--)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eMatches standard international 60-degree TPMT 1.5(1.5)1 \/ TPMT 1.5(1.5)2 profiles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eMatching Fasteners \u0026amp; Spares Included\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eHigh-Tensile Torx Drive Clamping Lock Screw \u0026amp; Flag Key Wrench\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eStandard globally interchangeable precision turning hardware assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #333; font-size: 16px; margin-top: 20px;\"\u003eIndustrial Cutting Feed \u0026amp; Speed Data Recommendation Table\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 25px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; min-width: 500px; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #eef0f7; color: #47479f;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eISO Workpiece Material Group\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eCutting Speed (Vc) Range\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eRecommended Feed Rate (fn)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eMild \/ Carbon Steel (P-Class \/ AISI 1020 \/ 1045)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e90 - 160 m\/min\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e0.03 - 0.12 mm\/rev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eAlloy Steel \/ Tool Steel (P-Class \/ 4140 \/ SCM440)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e60 - 130 m\/min\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e0.02 - 0.10 mm\/rev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eAustenitic Stainless Steels (M-Class \/ SS304 \/ SS316)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e50 - 110 m\/min\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e0.02 - 0.08 mm\/rev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold;\"\u003eCast Irons \/ Nodular Irons (K-Class \/ G25 \/ GGG40)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e70 - 140 m\/min\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e0.03 - 0.15 mm\/rev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e4. Product Application Scenarios\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Micro Internal Metal Evacuation:\u003c\/strong\u003e Executing high-precision semi-finishing and finishing runs inside small brass bushings, miniature aluminum blocks, or pre-drilled steel cavities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° Square Step Internal Boring:\u003c\/strong\u003e Due to the 93° approach geometry, the tool tip can clean right up to vertical shoulders in blind bores without causing catastrophic heel rub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicro-Diameter Profiling Cycles:\u003c\/strong\u003e Excellent for intricate internal contours, chamfers, and relief lines where the positive triangular insert provides optimal side clearance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e5. Equipment Tooling Compatibility Matrix\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Turrets \u0026amp; Micro Sleeves:\u003c\/strong\u003e Cylindrical 8mm shank fits directly into small Swiss-type gang tool slides, small CNC lathe turrets, or larger tool blocks utilizing standard 8mm precision reduction split sleeves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8mm Screw-Lock Triangular Inserts:\u003c\/strong\u003e Precision pocket layout is engineered to house globally standardized 60° triangular turning inserts with 11° positive clearance parameters (**TPMT 0802--** \/ **TPGT 0802--**).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e6. BEYOND Premium Carbide Grade Selection Guide\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 25px;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; min-width: 500px; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #47479f; color: #ffffff;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eBEYOND Cutting Insert Grade\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003eCoating Micro-Structure Matrix\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #dddddd; text-align: left;\"\u003ePrimary Application Strengths\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold; color: #47479f;\"\u003eBYM11 (CVD Grade)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eThick Double-Layer Al2O3 + TiCN Thermal Barrier\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eEngineered for high-speed, continuous boring of carbon steel and alloy liners. Highly resistant to crater wear under intense localized friction.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold; color: #47479f;\"\u003eBYS25 (PVD Grade)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eSub-Micron Multi-Layered Nano-TiAlN Coating Shield\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eOutstanding edge sharpness and edge toughness. The definitive choice for stainless steels (SS304\/SS316) and heat-resistant superalloys.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd; font-weight: bold; color: #47479f;\"\u003eBYK15 (Uncoated Polished)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eMirror-Finished Sharp Micro-Grain Solid Carbide Matrix\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eCompletely eliminates Built-Up Edge (BUE). Custom developed for ultra-precision turning of aluminum castings, brass bushings, and engineering polymers.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e7. Why Choose BEYOND CNC Machine Tools?\u003c\/h2\u003e\n\u003cp\u003eBEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing high-tensile structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.\u003c\/p\u003e\n\u003ch3 style=\"color: #333; font-size: 16px; margin-top: 20px;\"\u003eGlobal Machinist Operational Reviews\u003c\/h3\u003e\n\u003cdiv style=\"display: block; margin-bottom: 25px;\"\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; padding: 15px; border-radius: 6px; background-color: #ffffff; margin-bottom: 12px;\"\u003e\n\u003cdiv style=\"color: #ffcc00; font-size: 16px; margin-bottom: 5px;\"\u003e★★★★★\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-size: 13px; font-weight: bold;\"\u003eMark S. — United States\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px; color: #555;\"\u003e\"Excellent micro boring bar. We use it on our Haas desktop lathe for precision spacer rings. The 8mm steel shank is robust enough to pull a clean finish without harmonic waviness.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; padding: 15px; border-radius: 6px; background-color: #ffffff; margin-bottom: 12px;\"\u003e\n\u003cdiv style=\"color: #ffcc00; font-size: 16px; margin-bottom: 5px;\"\u003e★★★★★\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-size: 13px; font-weight: bold;\"\u003eKlaus R. — Germany\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-size: 13px; font-weight: bold;\"\u003e\"Sehr präzise pocket. Running polished TPGT inserts on aluminum castings. No top clamps mean the chips slide right out of the 12mm bore hole. Absolute buy suggestion.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; padding: 15px; border-radius: 6px; background-color: #ffffff; margin-bottom: 12px;\"\u003e\n\u003cdiv style=\"color: #ffcc00; font-size: 16px; margin-bottom: 5px;\"\u003e★★★★★\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-size: 13px; font-weight: bold;\"\u003eTakashi N. — Japan\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px; color: #555;\"\u003e\"We profile miniature stainless sleeves with this STUPR08 bar. The 93-degree angle hits our square shoulder requirements smoothly. The triangle insert gives a highly economical three-edge setup.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; padding: 15px; border-radius: 6px; background-color: #ffffff; margin-bottom: 12px;\"\u003e\n\u003cdiv style=\"color: #ffcc00; font-size: 16px; margin-bottom: 5px;\"\u003e★★★★☆\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-size: 13px; font-weight: bold;\"\u003eGiovanni B. — Italy\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px; color: #555;\"\u003e\"Very durable black chemical coat resists chip erosion well. Seating pocket is tight, which is critical when working with micro-inserts like TPMT 0802.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e0e0e0; padding: 15px; border-radius: 6px; background-color: #ffffff;\"\u003e\n\u003cdiv style=\"color: #ffcc00; font-size: 16px; margin-bottom: 5px;\"\u003e★★★★★\u003c\/div\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-size: 13px; font-weight: bold;\"\u003eWayne D. — United Kingdom\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 13px; color: #555;\"\u003e\"Perfect for light finishing passes on our toolroom lathe. Hardware is standard Torx so it is easy to swap edges without stripping. Excellent cost-to-performance ratio.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e8. AI-Style Engineering Support Engine (FAQ)\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 15px; padding: 12px; background-color: #f9f9f9; border-radius: 4px;\"\u003e\n\u003cp style=\"margin: 0 0 5px 0; font-weight: bold; color: #47479f;\"\u003eQ1: What is the primary advantage of a 93-degree approach angle over an 85-degree approach angle bar during micro internal boring?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #444;\"\u003eA1: It comes down to shoulder clearance and cutting direction. A 93-degree approach angle allows the tool tip to cut perfectly flat, square internal faces or 90° blind shoulders without the tool's secondary edge hitting or dragging along the bottom floor. An 85-degree bar cannot turn a square shoulder and will always leave an angled face behind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px; padding: 12px; background-color: #f9f9f9; border-radius: 4px;\"\u003e\n\u003cp style=\"margin: 0 0 5px 0; font-weight: bold; color: #47479f;\"\u003eQ2: Can I mount this 8mm metric boring bar into a standard 5\/16-inch American imperial tool block?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #444;\"\u003eA2: Close, but not directly. An 8mm shank measures approximately 0.3150 inches, which is slightly larger than a true 5\/16\" block opening (0.3125\"). To run this bar safely in imperial machinery, it is highly recommended to mount it inside a 3\/8\" or 1\/2\" imperial turret block utilizing an exact metric-to-inch split reduction sleeve to avoid damaging the ground steel shank.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px; padding: 12px; background-color: #f9f9f9; border-radius: 4px;\"\u003e\n\u003cp style=\"margin: 0 0 5px 0; font-weight: bold; color: #47479f;\"\u003eQ3: What is the absolute minimum bore entry diameter required to use this S08K-STUPR08 bar safely?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #444;\"\u003eA3: The absolute minimum machining bore diameter (φ Dmin) is 11.0mm. Although the solid alloy steel shank body is ground precisely to 8mm, the offset radial projection of the indexable triangular pocket and the profile thickness of the TPMT 0802 insert mean you must have an 11mm entry opening to avoid catastrophic collisions during rapid positioning moves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"color: #47479f; font-size: 20px; border-bottom: 2px solid #47479F; padding-bottom: 5px; margin-top: 30px;\"\u003e9. Technical Maintenance \u0026amp; Troubleshooting Guidelines\u003c\/h2\u003e\n\u003cdiv style=\"margin-top: 15px;\"\u003e\n\u003cdiv style=\"background-color: #f0f2f5; padding: 15px; border-radius: 4px; margin-bottom: 12px;\"\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; color: #333; font-size: 14px; border-left: 3px solid #47479F; padding-left: 8px;\"\u003eEquivalent Industry Models\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12px; color: #555;\"\u003eInterchangeable globally with standard international metric \u003cstrong\u003eS08K-STUPR08\u003c\/strong\u003e precision right-hand screw-clamped boring bars. For standard American imperial lathe turrets, this 8mm solid cylindrical steel shank serves as a drop-in for 3\/8-inch or 1\/2-inch imperial lathe toolholders when utilized with matching high-precision split reduction sleeves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background-color: #f0f2f5; padding: 15px; border-radius: 4px; margin-bottom: 12px;\"\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; color: #333; font-size: 14px; border-left: 3px solid #47479F; padding-left: 8px;\"\u003eTroubleshooting Tips\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12px; color: #555;\"\u003e\u003cstrong\u003eMicro-Chatter Waves or Poor Bore Finish:\u003c\/strong\u003e Always ensure the tool tip center line lines up exactly with the machine spindle centerline (±0.01mm). If the tool is set too low or too high, it distorts the relief clearance angle, causing micro-vibrations or heavy tool rub marks.\u003cbr\u003e\u003cstrong\u003eFastener Binding or Torx Screw Stripping:\u003c\/strong\u003e High-temperature metal swarf can generate extreme localized heat during deep-hole cuts. Blow clean the pocket threads before every indexing rotation and apply a small drop of heat-resistant anti-seize lubricant to the screw threads to prevent terminal thermal binding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background-color: #f0f2f5; padding: 15px; border-radius: 4px;\"\u003e\n\u003ch4 style=\"margin: 0 0 8px 0; color: #333; font-size: 14px; border-left: 3px solid #47479F; padding-left: 8px;\"\u003eWorkpiece Material Matrix\u003c\/h4\u003e\n\u003cp style=\"margin: 0; font-size: 12px; color: #555;\"\u003eOptimized across critical industrial engineering manufacturing stock material classifications: \u003cstrong\u003eP\u003c\/strong\u003e (Carbon, Low-Alloy \u0026amp; Pre-hardened Mild Steels), \u003cstrong\u003eM\u003c\/strong\u003e (Austenitic, Ferritic \u0026amp; Duplex Stainless steel variants), \u003cstrong\u003eK\u003c\/strong\u003e (Grey \u0026amp; Ductile Cast Irons), \u003cstrong\u003eN\u003c\/strong\u003e (Non-ferrous Aluminum Castings, Copper, Brass Alloys \u0026amp; Dense Polymers), and \u003cstrong\u003eS\u003c\/strong\u003e (High-Temperature Superalloys \u0026amp; Aerospace Titanium).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BEYOND","offers":[{"title":"Default Title","offer_id":40763699069100,"sku":"S08K-STUPR08","price":13.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/7328\/1708\/files\/BEYOND_S08K-STUPR08_precision_indexable_right-hand_micro_internal_hole_steel_boring_bar_with_8mm_solid_shank_125mm_length_93_degree_approach_angle_screw_lock_system_for_TPMT_080204_turning_inserts.jpg?v=1781309802","url":"https:\/\/cnchome-beyond.com\/products\/beyond-s08k-stupr08-boring-bar-tpgh0802-internal-turning-tool-holder","provider":"CNCHome-Beyond","version":"1.0","type":"link"}