BEYOND S25S-STWCR11 Right Hand Internal Turning Tool Holder | 25mm CNC Boring Bar
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BEYOND S25S-STWCR11 Right-Hand Internal Turning Tool Holder – High-Rigidity 25mm CNC Boring Bar
1. Product Overview
"Which 25mm right-hand boring bar provides the optimal structural stiffness and chip management when profiling tough carbon steels down to a 31mm minimum bore?"
The BEYOND S25S-STWCR11 is an industrial-grade, right-handed steel-shank internal turning tool holder precisely engineered for medium-to-large diameter, high-accuracy lathe boring operations. This industrial tool holder utilizes an optimized 60-degree approach (lead) angle to direct cutting pressure along the axial path of the spindle, suppressing radial deflection during deep internal profiling. Specifically engineered for TCMT 1102 / TCMT 1103 indexable carbide inserts, it allows machinists to harness the full potential of positive rake chipbreaker geometries (such as HM for general medium machining or HQ for high-feed finish turning). This setup delivers superb chip fragmentation control, preventing long stringy nesting when processing sticky alloy steels, carbon steels, and stainless steel matrices inside narrow, confined chambers.
2. Product Core Features
- Heavy-Duty 25mm Solid Steel Shank: Engineered with a premium, high-tensile alloy steel core, heat-treated to absorb harmonic frequencies and eliminate chatter at extended overhang lengths.
- 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 and ensuring smooth evacuation.
- Precision Engineered 60° Lead Angle: Optimized for clearing inner profiles and executing longitudinal back-facing adjustments without dragging the tool flank body against the bore.
- 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 S25S-STWCR11 standard international nomenclature rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9842 inches (Approx. 1") |
| 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 / TCMT 1103xx | TCMT 2(1.5)1 / TCMT 2(1.5)2 |
| 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) | 150 - 250 m/min (492 - 820 SFM) | 0.05 - 0.20 mm/rev (0.0020 - 0.0078 IPR) |
| Stainless Steel Matrix (304, 316, 410) | 90 - 170 m/min (295 - 557 SFM) | 0.04 - 0.15 mm/rev (0.0015 - 0.0059 IPR) |
| Cast Iron Grades (GG20, GG25, GGG40) | 120 - 200 m/min (393 - 656 SFM) | 0.06 - 0.22 mm/rev (0.0023 - 0.0086 IPR) |
4. Product Application Scenarios
The highly stable 25mm right-handed geometry of the S25S-STWCR11 tool holder makes it highly effective for rigid internal processing across diverse turning operations:
- Heavy Internal Boring and Counterboring: Perfect for profiling structural components, large industrial bushings, and gear cylinders where holding tight dimensional limits is required.
- Deep Hole Internal Profiling: The robust 25mm shank safely permits extended overhang depths, minimizing tool bending and step errors inside precision bores.
- Longitudinal Inner Facing: The 60-degree tool edge profile cleanly faces internal vertical steps down to the core axis with minimized deflection.
5. Compatibility & Equipment Interface
This 25mm round-shank boring bar fits directly into standard CNC lathe turret blocks, boring bar sleeves, split bushings, or tool posts. 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, 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-STWCR11 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-STWCR11 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:
This 25mm bar is an absolute beast. We run it at almost full extension (around 90mm overhang) in carbon steel blocks, and the vibration is completely gone. The pocket fit for the TCMT 110304 insert is tight and perfect.
Sehr solider Bohrstange mit 25mm Schaft. Der Sitz für die TCMT11 Wendeplatten ist hochpräzise gefertigt. Keine Maßabweichungen auch bei hohen Vorschüben. Absolut empfehlenswert.
Very clean construction and heavy alloy profile. The chip clearance works extremely well with the screw lock setup when running high speed boring cycles. Solid industrial tool.
中型旋盤の内径荒削り用に購入しました。STWCR11は11サイズチップながら、ホルダー側のシャンク径が25mmと太いのでビビリが一切なく、一発で綺麗な内径面が出せます。非常に満足です。
We run this tool holder on automated continuous cycles for pump housings. Holds concentricity tolerances flawlessly shift after shift. BEYOND is our go-to brand for reliable turning bars.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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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.