BEYOND S25S-STWCR16 Right Hand Internal Turning Tool Holder | 25mm CNC Boring Bar
✓ In Stock & Fast Dispatch: Order processing: typically 1–3 business days after confirmation.
✓ 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-STWCR16 Right-Hand Internal Turning Tool Holder – High-Rigidity 25mm CNC Boring Bar
1. Product Overview
"Which 25mm right-hand boring bar provides the optimal chip clearance and rigidity for internal turning in medium-sized blind holes down to 32mm?"
The BEYOND S25S-STWCR16 is an industrial-grade, right-handed steel-shank internal turning tool holder precisely engineered for medium-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 16T3 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
- Hardened Structural Alloy Steel: Fabricated from a heavy-duty, high-tensile alloy steel body, tempered to absorb harmonic frequencies and dramatically reduce chatter during deep internal boring cycles.
- 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-STWCR16 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) | 32 mm | 1.2598 inches |
| Compatible Carbide Insert Layout | TCMT 16T3 / TCGT 16T3 | TCMT 3(2.5)1 / TCMT 3(2.5)2 |
| Clamping Screw Model Type | M4.0 x 10.0 | 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) | 150 - 250 m/min (492 - 820 SFM) | 0.05 - 0.20 mm/rev (0.0020 - 0.0078 IPR) |
| Stainless Steel Matrix (304, 316, 410) | 100 - 170 m/min (328 - 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 mid-range 25mm right-handed geometry of the S25S-STWCR16 tool holder makes it highly effective for rigid internal processing across diverse turning operations:
- Standard Boring and Counterboring: Ideal for machining gear blanks, coupling sleeves, and bearing houses where reliable structural diameter tolerances are vital.
- Internal Profiling & Pocketing: Offers high stiffness for roughing and finishing internal stepped cavities, preventing taper errors caused by tool bending.
- 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-STWCR16 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-STWCR16 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:
Upgraded to this 25mm bar for running internal steps on alloy rings. Deflection dropped to zero compared to my old 20mm bar setup. Pocket alignment for the TCMT 16T3 insert is dead accurate.
Sehr stabiler Bohrstange. Die Verarbeitung des Plattensitzes ist erstklassig. TCMT 16T304 Wendeschneidplatten sitzen bombenfest, kein Mikrovibrationen spürbar.
Great heavy alloy body structure. Even during deeper roughing passes in carbon steel, the chips clear nicely along the low-profile clamp side. Satisfied with BEYOND quality.
25mmシャンクのSTWCR16を購入。中型旋盤での深穴ボーリングで最高の剛性を発揮してくれます。TCMTチップの切りくず処理がスムーズで、内面が非常にきれいに仕上がります。
We run this right-hand bar day in and day out on cast iron housings. Holds tolerances perfectly across long cycles. Highly recommend BEYOND for workshops wanting reliability.
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.