BEYOND S25S-STFCR11 Right Hand Internal Turning Tool Holder | 25mm CNC Boring Bar
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BEYOND S25S-STFCR11 Right-Hand Internal Turning Tool Holder – Heavy-Duty 25mm CNC Boring Bar
1. Product Overview
"Which 25mm right-hand boring bar provides maximum rigidity and chip control when machining deep, large-diameter internal cavities down to a 31mm minimum bore?"
The BEYOND S25S-STFCR11 is an industrial-grade, right-handed steel-shank internal turning tool holder precisely engineered for heavy-to-medium boring, internal profiling, and step-counterboring operations on CNC lathes. Featuring an optimized 91-degree approach (lead) angle, this tool holder effectively converts radial cutting pressures into axial forces directed straight down the spindle line, drastically reducing the tool deflection and harmonic chatter commonly encountered in deep bore machining. Built to accommodate TCMT 1102 / TCGT 1102 indexable carbide inserts, this holder allows machinists to exploit ultra-positive rake geometries and high-performance chipbreaker grooves. These properties ensure immediate chip fragmentation into light, manageable curls rather than hazardous stringy nests, making it highly effective for continuous internal runs across alloy steels, carbon steels, and demanding stainless steel matrices.
2. Product Core Features
- Premium Hardened Structural Alloy Steel: Thermal-treated steel shank delivers outstanding tensile strength and yield toughness, allowing stable machining operations at overhang limits up to 4X tool diameter.
- High-Torque Screw-Down Lock Mechanism: Low-profile screw clamping ensures absolute pocket lock rigidity while providing unobstructed clearance for rapid chip evacuation in confined bores.
- 91° Precision Lead Profiling Angle: Enables precise multi-directional profiling paths and true 90-degree internal square shoulder contouring without tool body dragging or rubbing.
- Industrial Anti-Corrosion Oxide Finish: Advanced black-oxide layer provides high thermal stability and prevents premature pocket erosion or corrosion under high-pressure water-soluble coolants.
3. Technical Specifications & Metric/Imperial Reference
Clear nomenclature comprehension ensures error-free CNC programming. Below is the precise structural parsing of the S25S-STFCR11 standard international ISO code rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9842 inches (Fits 1" Sleeves with proper bushing) |
| Total Tool Length (L) | 250 mm | 9.8425 inches |
| Minimum Bore Diameter (D-min) | 31 mm | 1.2204 inches |
| Compatible Carbide Insert Layout | TCMT 1102xx / TCGT 1102xx | TCMT 2(1.5)1 / TCMT 2(1.5)2 |
| Clamping Screw Model Type | M2.5 x 6 | M2.5 x 0.23 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) | 140 - 240 m/min (459 - 787 SFM) | 0.10 - 0.30 mm/rev (0.0039 - 0.0118 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 90 - 160 m/min (295 - 524 SFM) | 0.08 - 0.22 mm/rev (0.0031 - 0.0086 IPR) |
| Cast Iron Grades (GG25, GGG50) | 100 - 190 m/min (328 - 623 SFM) | 0.10 - 0.35 mm/rev (0.0039 - 0.0137 IPR) |
4. Product Application Scenarios
The thick, robust 25mm shank diameter of the S25S-STFCR11 provides high-rigidity tracking for heavy-duty internal machining operations:
- Heavy-Duty CNC Internal Boring: Optimized for deep roughing and precision finishing runs on mid-to-large sizing cylinders and structural machine tubes.
- 90-Degree Corner Facing: The 91-degree alignment profile lets the tool sweep face walls clean inside internal blind bores, avoiding back-face friction.
- Interrupted Cut Internal Profiling: Steel shank core excels at dampening mechanical shocks when boring parts with cross-drilled internal relief paths.
5. Compatibility & Equipment Interface
This 25mm cylindrical tool shank interfaces directly with standard heavy-duty CNC lathe turrets, VDI/BMT boring bar holders, split adapter sleeves, and specialized quick-change tool blocks. It operates smoothly on medium-to-large automated CNC turning centers from premium global manufacturers (such as Haas ST-30 series, Mazak Quick Turn, Doosan/DN Solutions Lynx/Puma, Okuma, and Mori Seiki). Engineered for standard right-handed tool paths.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S25S-STFCR11 boring bar with the proper BEYOND proprietary insert grade to achieve maximum tool life and optimal chip breaks:
- BYM11 Grade (PVD Coated Substrate): Designed with a nano-layered TiAlN matrix. Excels at cutting sticky materials like 304 stainless steel by resisting built-up edge (BUE).
- BYM25 Grade (Premium CVD Dual-Coated): Features thick multi-layer Al2O3 + TiN plating. Highly optimized for stable, high-velocity continuous roughing cycles on carbon and structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for extreme abrasion resistance. The premier choice for wet or dry high-speed internal turning on cast iron housings.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we balance industrial durability with high precision. Every S25S-STFCR11 boring bar goes through meticulous Coordinate Measuring Machine (CMM) quality control to guarantee that insert pocket tolerances remain within ±0.01mm. This strict testing delivers dependable indexing repeatability and uniform tool life across demanding multi-shift manufacturing cycles.
Global Machinist Field Reports:
Upgraded from a 20mm bar to this 25mm BEYOND shank for long hydraulic sleeve runs. Total game changer. Harmonic chatter is completely gone at 80mm extension depths. Holds the TCMT 11 size insert flawlessly.
Hervorragende Qualität. Der 25mm Stahlschaft ist extrem massiv und verwindungssteif. Die Plattensitzgenauigkeit für TCMT110204 ist perfekt, kein mikroskopisches Verrutschen bei schweren Schnitten. Sehr gutes Preis-Leistungs-Verhältnis.
Great heavy-duty bar for internal turning. It fits perfectly into our split sleeve setup. Clean chip evacuation and the screw head doesn't strip out under high-torque locking.
25mm径のシャンクは剛性が別格です。4140調質鋼の内径ボーリングで使用しましたが、ビビリマークが一切出ず綺麗な仕上げ面が得られました。チップの寿命も延びています。
We run these bars all day long on our job shop lathe setup. Excellent tolerances, cost-effective replacement for more expensive brand names, and pocket wear is minimal after thousands of parts.
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.