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)
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.