BEYOND S25S-STFCR16 Right Hand Internal Turning Tool Holder | 25mm CNC Boring Bar
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BEYOND S25S-STFCR16 Right-Hand Internal Turning Tool Holder – High-Rigidity 25mm CNC Boring Bar
1. Product Overview
"Which 25mm right-hand boring bar provides optimal chip clearance and high rigidity for internal turning or profiling inside deep cavities down to a 32mm minimum bore?"
The BEYOND S25S-STFCR16 is an industrial-grade, right-handed steel-shank internal turning tool holder precisely engineered for medium-to-large internal boring, profiling, and step-turning operations on CNC lathes. This industrial tool holder utilizes an optimized 91-degree approach (lead) angle to minimize radial cutting pressure, effectively re-directing cutting forces axially along the lathe spindle line to eliminate harmful chatter spikes in deep cavities down to a 32mm minimum bore entry. Specifically engineered for TCMT 16T3 / TCGT 16T3 indexable carbide inserts, it allows machinists to exploit premium positive rake chipbreaker geometries (such as HF for finishing or HM/HM2 for medium-to-rough cutting). This setup guarantees superior chip fragmentation, successfully breaking up potential stringy nests when processing sticky alloy steels, hardened carbon steels, and stainless steel matrices inside deep, constrained internal chambers.
2. Product Core Features
- High-Tensile Hardened Alloy Steel: Fabricated from an ultra-tough structural spring-steel matrix, thermal-hardened to optimize tensile strength and suppress harmonics at reach lengths up to 4X shank diameter.
- High-Torque Screw-Down Clamping Matrix: Secure low-profile screw-lock setup offers maximum clearance for heavy chip volume evacuation, preventing pocket erosion and insert shifts under high feed velocities.
- 91° Precision Clearance Profile: Tailored for deep boring, longitudinal profile steps, and multi-directional contouring paths without risk of tool body dragging or flank-wear rubbing.
- Industrial Anti-Wear Oxide Finish: Advanced black-oxide skin layer maximizes resistance to thermal scaling and corrosion when continuously exposed to high-pressure water-soluble cutting oils.
3. Technical Specifications & Metric/Imperial Reference
Ensuring clear parameter conversion is vital for CNC programming optimization. Below is the precise structural parsing of the S25S-STFCR16 standard international nomenclature rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9843 inches (~1") |
| Total Tool Length (L) | 250 mm | 9.8425 inches |
| Minimum Bore Diameter (D-min) | 32 mm | 1.2598 inches |
| Compatible Carbide Insert Layout | TCMT 16T3xx / TCGT 16T3xx | TCMT 3(2.5)1 / TCMT 3(2.5)2 |
| Clamping Screw Model Type | M4.0 x 10 | M4.0 x 0.39 inches |
| Torx Key Driver Wrench Size | T15 | T15 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) | 130 - 210 m/min (426 - 689 SFM) | 0.08 - 0.25 mm/rev (0.0031 - 0.0098 IPR) |
| Stainless Steel Matrix (304, 316, 410) | 80 - 150 m/min (262 - 492 SFM) | 0.06 - 0.20 mm/rev (0.0023 - 0.0078 IPR) |
| Cast Iron Grades (GG20, GG25, GGG40) | 90 - 170 m/min (295 - 557 SFM) | 0.08 - 0.30 mm/rev (0.0031 - 0.0118 IPR) |
4. Product Application Scenarios
The highly rigid 25mm right-handed core of the S25S-STFCR16 tool holder makes it an excellent choice for a variety of critical internal turning jobs:
- CNC Lathe Boring Operations: Ideal for standard CNC turning centers running right-hand feed configurations to bore medium-to-large cylindrical parts.
- Precision Internal Profiling: Delivers exceptional support for boring hydraulic manifold housings, industrial valve beds, and intermediate transmission casings.
- Longitudinal Step-Boring: The 91-degree lead configuration allows seamless pocket-turning transitions down internal right-angle walls with near-zero radial stress or push-off.
5. Compatibility & Equipment Interface
This 25mm round-shank boring bar fits directly into standard CNC lathe turret blocks, medium boring bar sleeve blocks, split bushings, or specialized tool holders. It interfaces seamlessly with precision CNC lathe systems and automated turning setups from leading global brands (including Haas, Mazak, Doosan/DN Solutions, Mori Seiki, Okuma, Citizen, and Fanuc). Optimized for right-handed tool paths running standard internal configurations.
6. BEYOND Premium Substrate & Grade Selection Matrix
To maximize chip control and wear life, pair your S25S-STFCR16 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 S25S-STFCR16 holder passes strict Coordinate Measuring Machine (CMM) checking procedures to guarantee insert pocket dimensional accuracy within ±0.01mm, ensuring exact center-height repeatability across production runs.
Global Machinist Field Reports:
We run this 25mm bar on our lathe to finish bore medium alloy sleeves. Shocked by how solid it feels at full length extension. Chip clearance is outstanding with the TCMT16 size insert.
Sehr präzise gearbeiteter Plattensitz für TCMT16T3. Die Klemmschraube hält absolut bombenfest. Der Spanabfluss läuft durch den 91° Winkel optimal aus der Bohrung ab. Sehr zu empfehlen!
Highly rigid steel construction. The 25mm shank profile is exactly what we needed for clearing internal channels under 40mm diameter. No flexing issues found.
25mm径のシャンクですが剛性が非常に高く、深穴加工の仕上げでもビビリが全く発生しません。TCMT16チップのホールド感も非常に安定しています。切り粉が綺麗に分断されます。
Swapped out expensive big-brand holders for these BEYOND 25mm bars. Precision is dead-on, and center height matches perfectly. Saved us hundreds on tooling replacement costs.
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.