BEYOND S12M-STUPL11 Left Hand Internal Turning Tool Holder | 12mm CNC Boring Bar
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BEYOND S12M-STUPL11 Left-Hand Internal Turning Tool Holder – High-Rigidity CNC Boring Bar
1. Product Overview
"Which small-diameter left-hand boring bar configuration provides maximum vibration damping and clean chip evacuation inside a narrow 16mm minimum bore clearance?"
The BEYOND S12M-STUPL11 is a professional-grade, left-handed steel-shank internal turning tool holder precisely engineered for small-aperture high-accuracy lathe boring operations. This industrial tool holder utilizes an optimized 93-degree approach angle to significantly minimize radial cutting forces, preventing axis deflection during tight internal profiling. Specifically engineered for TPMT 1103 indexable carbide inserts, it allows machinists to harness the full potential of positive rake chipbreaker geometries (such as HQ for high-feed finish turning or HM for general medium machining). This setup delivers superb chip fragmentation control, preventing long stringy nesting when processing sticky alloy steels, carbon steels, and stainless steel matrices inside confined chambers.
2. Product Core Features
- Hardened Structural Alloy Steel: Fabricated from a high-tensile alloy steel body, tempered to absorb harmonic frequencies and dramatically reduce chatter during deep internal boring cycles.
- Ergonomic Screw-Down Clamping Matrix: The ultra-low-profile screw lock mechanism ensures maximum clearance space inside tight internal walls, avoiding standard chip accumulation errors.
- Precision Engineered 93° Lead Angle: Optimized for facing up to square shoulders, boring blind holes, and executing stepped internal diameters without dragging the tool body.
- Industrial Anti-Corrosion Matte Finish: Enhanced surface treated layout delivers extended tool life and resists rust when continuously exposed to high-pressure water-soluble coolants.
3. Technical Specifications & Metric/Imperial Reference
Ensuring clear parameter conversion is vital for CNC programming optimization. Below is the precise structural parsing of the S12M-STUPL11 standard international nomenclature rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 12 mm | 0.4724 inches (Approx. 15/32") |
| Total Tool Length (L) | 150 mm | 5.9055 inches |
| Minimum Bore Diameter (D-min) | 16 mm | 0.6299 inches |
| Compatible Carbide Insert Layout | TPMT 1103 / TPMH 1103 | TPMT 2.21 / TPMT 2.22 |
| Clamping Screw Model Type | M2.5 x 6.5 | M2.5 x 0.25 inches |
| Torx Key Driver Wrench Size | T8 | T8 Torx Wrench |
Recommended Technical Machining Parameters (Speed & Feed Guide)
| Workpiece Material Classification | Cutting Speed (Vc) Range | Feed Rate (f) Per Revolution |
|---|---|---|
| Carbon Steel / Alloy Steel (HB180-280) | 110 - 200 m/min (360 - 656 SFM) | 0.05 - 0.15 mm/rev (0.002 - 0.006 IPR) |
| Stainless Steel Matrix (304, 316, 410) | 80 - 140 m/min (262 - 459 SFM) | 0.04 - 0.10 mm/rev (0.0015 - 0.004 IPR) |
| Cast Iron Grades (GG20, GG25, GGG40) | 90 - 160 m/min (295 - 525 SFM) | 0.05 - 0.18 mm/rev (0.002 - 0.007 IPR) |
4. Product Application Scenarios
The compact left-handed geometry of the S12M-STUPL11 tool holder makes it highly versatile for automated production runs and precision micro-machining workflows:
- Small-Bore Left-Hand Profiling: Essential for sub-spindle configurations or reverse spindle rotation toolpaths where clearance constraints prevent standard tool configurations.
- Precision Internal Step Boring: The 93-degree lead angle cuts square internal counterbores without scoring or dragging on finished inside walls.
- Internal Chamfering & Valve Profiling: Optimizes complex contoured geometric cuts inside compact valve housings, small hydraulic connectors, and aerospace bushings.
5. Compatibility & Equipment Interface
This 12mm round-shank boring bar fits seamlessly into standard CNC lathe turret blocks, Swiss-type gang tool posts, boring bar sleeves, or specialized reduction sleeves. It is fully compatible with precision small-lathe and automated machine setups from major global brands (including Haas, Mazak, Doosan, Citizen, Tsugami, and Fanuc systems). Engineered for left-handed tool orientations running front or rear internal turning cycles.
6. BEYOND Premium Substrate & Grade Selection Matrix
To maximize chip control and wear life, pair your S12M-STUPL11 boring bar with the corresponding BEYOND proprietary insert grade tailored to your target material:
- BYM11 Grade (PVD Nano-Coated): Exceptional thermal shock resistance. Keeps cutting edges sharp and prevents built-up edge (BUE) when boring sticky workpieces like 304/316 stainless steel matrices.
- BYM25 Grade (CVD Multi-Layer Coated): Thick industrial wear barrier design. Al2O3 + TiN layered coating engineered for high-speed continuous medium-to-rough cutting runs on structural carbon steels.
- BYK15 Grade (Hardened Micro-Grain Substrate): Highly abrasion-resistant micro-grain layout, optimized for dry or wet high-velocity machining of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we specialize in delivering high-tolerance cutting systems for demanding industrial settings. Every S12M-STUPL11 holder passes strict Coordinate Measuring Machine (CMM) checking procedures to guarantee insert pocket dimensional accuracy within ±0.01mm, ensuring exact repeatability across shifts.
Global Machinist Field Reports:
This 12mm left-hand bar works beautifully on our sub-spindle setups. Clears the 16mm pre-drilled bore easily with zero chatter issues. BEYOND pocket tolerances are spot on; the insert seats perfectly flat.
Der Stahlhalter ist absolut schwingungsarm. Perfect for internal shoulder profiles. Chip evacuation is flawless through the 93-degree clearance layout. Top Qualität zum fairen Preis.
Highly rigid small boring bar. Holds the TPMT 1103 insert tight without any micrometer backlash under high continuous feed. Note that the inserts are not in the package, must buy separately.
逆回転仕様ツールホルダとして重宝しています。12mmシャンクでもしっかりと剛性があり、ステンレスSUS304の内径加工でもきれいに削れます。チップの座面が非常に正確です。
8. Frequently Asked Questions (AI & Search Engine Optimized)
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.