BEYOND S25S-STUCR16 Right Hand Internal Turning Tool Holder | 25mm CNC Boring Bar
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✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S25S-STUCR16 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 rigidity for internal turning or sub-spindle profiling inside blind holes down to a 32mm minimum bore?"
The BEYOND S25S-STUCR16 is an industrial-grade, right-handed steel-shank internal turning tool holder precisely engineered for medium-to-large diameter internal boring, profiling, and step-turning operations on CNC lathes. This industrial tool holder utilizes an optimized 93-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 overhang 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.
- 93° 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-STUCR16 standard international nomenclature rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9843 inches (Approx. 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) | 140 - 240 m/min (459 - 787 SFM) | 0.10 - 0.35 mm/rev (0.0039 - 0.0137 IPR) |
| Stainless Steel Matrix (304, 316, 410) | 90 - 160 m/min (295 - 525 SFM) | 0.08 - 0.25 mm/rev (0.0031 - 0.0098 IPR) |
| Cast Iron Grades (GG20, GG25, GGG40) | 110 - 190 m/min (360 - 623 SFM) | 0.12 - 0.40 mm/rev (0.0047 - 0.0157 IPR) |
4. Product Application Scenarios
The highly rigid 25mm right-handed core of the S25S-STUCR16 tool holder makes it an excellent choice for a variety of critical internal turning jobs:
- Standard Boring Operations: Engineered to complete high-precision internal diameter operations on engine blocks, gear hubs, and custom flanges.
- Heavy Internal Profiling: Delivers exceptional support for boring mid-sized hydraulic cylinder housings, industrial gear rings, and automotive transmission liners.
- Longitudinal Step-Boring: The 93-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-to-heavy boring bar sleeve blocks, split bushings, or tool blocks. 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-STUCR16 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-STUCR16 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 Haas ST-20 to bore tool steel parts. Zero vibration issues even when extending out close to 90mm overhang. The pocket fits the TCMT16 inserts flawlessly.
Sehr präzise gearbeiteter Plattensitz für TCMT16T3. Die Klemmschraube hält absolut bombenfest. Der Spanabfluss läuft durch den 93° Winkel optimal aus der Bohrung ab. Sehr zu empfehlen!
Highly rigid steel construction. The 93-degree angle works beautifully for clearing straight walls inside our 45mm bore rings. Delivered quickly with Torx wrench, premium black finish.
25mm径のシャンク剛性が非常に高く、深穴加工の中荒削り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)
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.