BEYOND S25S-SDWCL11 Internal Boring Bar 25mm Shank CNC Turning Tool Holder
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ OPERATIONAL NOTICE: The cutting insert is NOT included with this tool holder. Carbide inserts shown in product imagery are intended strictly for application setup and visual mapping.
BEYOND S25S-SDWCL11 Internal Boring Bar & CNC Lathe Turning Tool Holder
1. Product Overview
Engineers Search: "Which rigid 25mm internal boring bar provides premium surface finishes and stable chipbreaking with W-type indexable inserts?"
The BEYOND S25S-SDWCL11 is an industrial-grade, mid-range screw-on internal boring bar engineered for high-precision left-hand (L) CNC lathe internal profiling, copying, and medium-roughing routines. Designed specifically for tight-to-medium internal spaces requiring robust chip evacuation, this tool holder incorporates a precision-ground pocket matrix that securely clamps 80° trigon indexable WNMG0604 / WD_1104 carbide inserts. By combining a high-density tempered steel shank with optimized chipbreaker clearance angles, it suppresses micro-vibrations and ensures continuous swarf evacuation even when processing challenging alloy steels and stainless steel grades.
2. Product Core Features
- High-Tensile Hardened Steel Body: Heat-treated to HRC 42-45, absorbing complex multi-directional torsional strains under heavy continuous cuts.
- 25mm Rigid Profile: Ideal structural footprint that minimizes tool deflection during intermediate internal diameter (ID) boring operations.
- 93° Dynamic Lead Angle ($X$): Tailored to smoothly deflect chips forward and out of the cut path, protecting the internal wall's geometric finish.
- Industrial Matte Black Oxide Coating: Chemical conversion treatment guards against abrasive wear from flowing swarf and protects against aggressive coolants.
Model Nomenclature Decoder: S25S-SDWCL11
Steel Shank Body
25mm Shank Dia.
250mm Total Length
Screw Clamping
55° Diamond clearance / W-insert alignment
80° Trigon Insert Fit
7° Relief Clearance
Left Hand Orientation
11mm Insert Edge Size
Looking for the Mirrored Right-Hand (R) Companion Boring Bar for Your Machine Turret?
Explore the S25S-SDWCR11 (Right Hand) Tool Holder →3. Technical Specifications & Dimension Comparison
| Technical Variable | Metric Model (S25S-SDWCL11) | Imperial / Inch Conversion Equivalence |
|---|---|---|
| Shank Diameter ($d$) | 25 mm | ~ 0.9842 inches (standard: 1" shank) |
| Overall Length ($L$) | 250 mm | ~ 9.8425 inches |
| Minimum Bore Clearance ($D_{min}$) | 32 mm | ~ 1.2598 inches |
| Matching Insert Index | WNMG 0604-- / WD_ 1104-- Series | WNMG 33- series / W-Trigon equivalent |
| Fasteners (Included) | M3.5 Structural Screw + T15 Wrench | M3.5 Hardened Screw + T15 Torx Key |
Optimal Industrial Machining Parameters
| ISO Workpiece Material Group | Cutting Speed ($V_c$) Recommended | Feed Rate per Revolution ($f$) |
|---|---|---|
| Steel Alloys / Structural Metals (P-Class) | 130 - 220 m/min | 0.08 - 0.28 mm/rev |
| Stainless Austenitic Steel (M-Class) | 90 - 160 m/min | 0.06 - 0.20 mm/rev |
| Cast Iron / Gray Cast (K-Class) | 100 - 190 m/min | 0.10 - 0.32 mm/rev |
4. Industrial Applications
The versatile 25mm footprint of the S25S-SDWCL11 bridges the gap between micro-boring and heavy roughing:
- Intermediate Internal Profiling: Processes complex internal contours safely down to a 32mm entry boundary limit.
- Deep Chamber Semi-Finishing: Delivers extreme structural damping across medium cantilever projections up to 100mm without surface degradation.
- Step and Blind Hole Profiling: Excels at plunging and executing clean 90° shoulder profiles inside mid-sized valve blocks, bearings, and hydraulic housings.
5. Equipment & Tooling Compatibility
- CNC Turning Centers: Natively matches standard CNC turret blocks, driven tool stations, or sliding blocks rated for 25mm or 1" cylindrical tooling.
- Conventional Engine Lathes: Mounts securely using standard 25mm round split sleeves or quick-change tool holders.
- Universal Insert Fitment: Pocket architecture strictly follows international standards, providing 100% geometric pairing with standard WNMG 0604-- / WD_ 1104-- inserts across all major verified insert brands.
6. BEYOND Brand Grade Optimization Guide
Optimize tool longevity and chip break consistency by selecting the specialized BEYOND insert formulation for your workload:
| BEYOND Insert Grade | Substrate Coating Treatment | Ideal Application Material Focus |
|---|---|---|
| BYM11 (CVD) | Thick Multilayer TiN + Al2O3 Shielding | Engineered for high-sfm continuous cutting paths in carbon steels, alloy steels, and pre-hardened industrial molds. |
| BYS25 (PVD) | Nano-Structured TiAlN Ultra-Hard Finish | Excellent against thermal fracturing; tailored for heavy interrupted cuts and 300/400 series stainless steels. |
| BYK15 (Uncoated) | Mirror-Polished Ultra-Micro Grain Substrate | High-velocity machining of non-ferrous aluminum alloys, structural brass, and smooth polymer blocks. |
7. Why Choose BEYOND CNC Tools?
BEYOND supplies premium, rigid tool holders to automated production houses worldwide. By maintaining strict control over pocket tolerances and utilizing advanced heat-treated steel, our bars prevent dimensional drifting, lower insert replacement frequency, and optimize machine cycle profitability.
Global Machinist Feedback
Derek S. — United States
"Perfect fit for our mid-sized turning cell. The 25mm shank is incredibly rigid and holds sizes across long runs. Highly recommend the W-type insert pocket."
Hans W. — Germany
"Hervorragende Vibrationsdämpfung. We process pre-hardened tool steel components, and this bar leaves a flawless finish inside the 35mm bores."
Fabio M. — Italy
"Portautensili molto rigido. Screw alignment and seating are very clean, making insert index changes precise. Quick tracking info."
Takashi N. — Japan
"ねじ止めが非常に安定している。The pocket accuracy preserves the fragile corners of our finishing inserts. Excellent quality-to-price ratio."
"Solid bit of kit for the job shop. Thread processing on the clamping pin handles daily tightening without stripping."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the recommended maximum safe boring depth for this solid steel 25mm bar?
A1: For general solid steel alloy bodies, the conservative structural limit for extension is **3x to 4x the shank diameter**. For this 25mm bar, your optimal rigid extension target falls between **75mm and 100mm**. Exceeding 4x may require custom boring parameters or a reduced feed rate ($f$).
Q2: Can I mount standard DCMT inserts into the pocket of the S25S-SDWCL11?
A2: **No.** DCMT inserts utilize a 55° rhombic shape, whereas this pocket is uniquely ground to support the 80° trigon structural angle of **WNMG 0604-- / WD_ 1104--** configurations. Attempting to force different shapes will permanently damage the seat alignment.
Q3: When should I choose a Left-Hand (L) boring bar variant over a Right-Hand (R) version?
A3: Left-Hand bars cut with reverse spindle rotation paths ($M04$) or are utilized when mounting the holder facing upside-down on a standard rear turret. This setup helps direct chips downward, using gravity to prevent nesting issues inside deep bores.
9. Technical Maintenance & Diagnostic Guidelines
Equivalent Industry Models
Interchangeable with global industrial metrics standard coding **S25S-SDWCL11**. Drop-in replacement for standard 1-inch tool holders using 80-degree clearance index layouts.
Troubleshooting Tips
Micro-Chatter at Max Extension: Slightly decrease cutting speed ($V_c$) and increase your feed rate ($f$) to load the bar's structural profile and minimize vibration.
Rapid Pocket Erosion: Routinely check that the clamping screw is torqued evenly to 2.5 Nm to prevent micro-rotation during heavy roughing.
Workpiece Material Matrix
Fully optimized across standard groups: **P** (Alloy & Structural Steels), **M** (Stainless Steel alloys), **K** (Grey & Ductile Cast Iron), **N** (Aluminum/Copper Non-ferrous series), and **S** (High-temp superalloys).
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.