BEYOND S20R-SDWCR11 Internal Boring Bar 20mm 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 setup reference and visual application mapping.
BEYOND S20R-SDWCR11 Precision Internal Boring Bar & CNC Lathe Tool Holder
1. Product Overview
Engineers Search: "Which rigid 20mm right-hand boring bar cuts smooth internal diameters using 55-degree diamond DCMT11T3 inserts in tight CNC lathe blocks?"
The BEYOND S20R-SDWCR11 is a high-precision, screw-on internal boring bar specifically engineered for right-hand (R) CNC lathe internal profiling, pocket copying, and fine semi-roughing routines. Designed to enter tight bore openings down to a minimum clearance diameter of 25mm, this holder features a specialized 55° pocket geometry that securely seats DCMT 11T3-- indexable carbide inserts (such as DCMT 11T304 / DCMT 11T308). Machined from premium tempered alloy steel, the 20mm shank strikes the perfect balance between low spatial footprint and maximum torsional stiffness, providing clean chip clearance paths for deeper bore lines without tool deflection.
2. Product Core Features
- Hardened Structural Alloy Steel Shank: Heat-treated to HRC 42-45 to withstand complex deflection stresses in deep internal cavities.
- Compact 20mm Profile: Specifically engineered for small-to-medium internal diameters, allowing clearance where bulky bars fail.
- 93° Dynamic Lead Geometry ($X$): Optimizes chip break paths by rolling swarf forward out of the bore, keeping the freshly machined surface clean.
- Anti-Corrosive Black Oxide Finish: Protects the tool body from abrasive chip rubbing and chemical wear caused by high-pressure cutting fluids.
Model Nomenclature Decoder: S20R-SDWCR11
Steel Shank Body
20mm Shank Dia.
200mm Total Length
Screw Clamping System
55° Diamond Insert Shape
93° Tool Cutting Edge Angle
7° Relief Clearance Angle
Right Hand Orientation
11mm Insert Edge Size
Looking for the Mirrored Left-Hand (L) Companion Unit for Your CNC Setup?
Explore the S20R-SDWCL11 (Left Hand) Tool Holder →3. Technical Specifications & Dimension Comparison
| Technical Variable | Metric Model (S20R-SDWCR11) | Imperial / Inch Conversion Equivalence |
|---|---|---|
| Shank Diameter ($d$) | 20 mm | ~ 0.7874 inches (standard: 3/4" shank class) |
| Overall Length ($L$) | 200 mm | ~ 7.8740 inches |
| Minimum Bore Clearance ($D_{min}$) | 25 mm | ~ 0.9842 inches |
| Matching Insert Index | DCMT 11T304 / DCMT 11T308 Series | DCMT 32.51 / DCMT 32.52 industrial equivalence |
| Fasteners (Included) | M2.5 Pocket Screw + T8 Torx Key | M2.5 Hardened Screw + T8 Structural Wrench |
Optimal Industrial Machining Parameters
| ISO Workpiece Material Group | Cutting Speed ($V_c$) Recommended | Feed Rate per Revolution ($f$) |
|---|---|---|
| Steel Alloys / Low Carbon (P-Class) | 140 - 240 m/min | 0.05 - 0.20 mm/rev |
| Stainless Steel Grades (M-Class) | 90 - 180 m/min | 0.05 - 0.15 mm/rev |
| Cast Iron / Nodular Iron (K-Class) | 100 - 200 m/min | 0.06 - 0.22 mm/rev |
4. Industrial Applications
The S20R-SDWCR11 excels at micro-enveloping and intermediate metal cutting tasks:
- Small Bore Internal Profiling: Safely contours inner spaces with narrow entrance boundaries down to 25mm using highly versatile 55° diamond insert lines.
- Chamber Copying and Semi-Finishing: Dampens micro-harmonics across intermediate cantilever projections up to 70mm, preserving fine finish thresholds.
- Blind Hole Machining: The screw-down design leaves ample clearing space for chip evacuation, eliminating tool jams at the back of blind steps.
5. Equipment & Tooling Compatibility
- CNC Turning Centers: Natively matches standard 20mm round boring bar blocks or split reduction sleeves on modern turrets.
- Conventional Engine Lathes: Mounts securely inside universal quick-change tool posts or multi-tool blocks.
- Global Insert Standardization: Engineered to standard ISO tolerances, providing a perfect fit for 55° clearance DCMT 11T304 / DCMT 11T308 indexable carbide inserts across all major brands.
6. BEYOND Brand Grade Optimization Guide
Match your workpiece material with the proper BEYOND insert grade to maximize tool life and chipbreaker efficiency:
| BEYOND Insert Grade | Substrate Coating Treatment | Ideal Application Material Focus |
|---|---|---|
| BYM11 (CVD) | Thick Multilayer TiN + Al2O3 Shielding | Engineered for stable, high-speed continuous cuts in carbon steels, pre-hardened alloys, and mold materials. |
| BYS25 (PVD) | Nano-Structured TiAlN Ultra-Hard Finish | High resistance to thermal shock. Built for interrupted cuts, tough scale, and 300/400 series stainless steels. |
| BYK15 (Uncoated) | Mirror-Polished Ultra-Micro Grain Substrate | Designed for high-sfm machining of non-ferrous materials like aluminum alloys, structural brass, and polymers. |
7. Why Choose BEYOND CNC Tools?
BEYOND designs rigid tool holders for automated manufacturing plants globally. By maintaining strict quality controls over insert pocket positioning and utilizing advanced heat-treated alloy steel, our boring tools limit structural chatter, reduce insert wear, and lower production costs.
Global Machinist Feedback
Robert T. — United States
"Excellent rigidity for a 20mm bar. We run this right-hand bar with DCMT 11T304 inserts inside alloy tube stock on our lathe, and it holds tight tolerances beautifully."
Manfred K. — Germany
"Sehr gute Oberflächenqualität. The screw alignment is exact, making DCMT index modifications quick and repeatable between shift cycles."
Enrico F. — Italy
"Portautensili molto rigido e stabile. Handles water-soluble cutting oils without losing pocket alignment over continuous runs."
Satoshi I. — Japan
"スクリューの精度が完璧です。Locks indexable DCMT inserts flat into the seat, preventing surface chatter on deep profiling paths."
Graeme T. — Australia
"Good solid tool body. The black oxide coating treats chip friction well when pulling deep internal boring passes."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the maximum safe boring depth extension for this 20mm steel bar?
A1: For standard solid steel alloy bodies, the recommended structural projection limit is **3x to 4x the shank diameter**. For this 20mm bar, your optimal rigid extension target falls between **60mm and 80mm**. Exceeding 4x may introduce micro-harmonics and require a reduction in feed rate ($f$).
Q2: Can I mount CCMT inserts into the pocket of the S20R-SDWCR11?
A2: **No.** CCMT inserts utilize an 80° rhombic profile, whereas this pocket orientation is engineered specifically for the 55° diamond layout of **DCMT 11T3--** configurations. Attempting to fit a CCMT insert will destroy the pocket walls.
Q3: When should I choose a Right-Hand (R) boring bar variant over a Left-Hand (L) version?
A3: Right-Hand bars are standard for standard forward spindle setups ($M03$) when machining internally toward the headstock on standard turret configurations, ensuring the cutting edge faces upward to meet tool post clearances.
9. Technical Maintenance & Diagnostic Guidelines
Equivalent Industry Models
Interchangeable with global industrial metrics standard coding **S20R-SDWCR11**. Drop-in replacement for standard 3/4-inch tool holders using 55-degree diamond DCMT pocket layouts.
Troubleshooting Tips
Micro-Chatter at Max Extension: Slightly decrease cutting speed ($V_c$) and increase your feed rate ($f$) to properly load the tool body profile and break chips quickly.
Rapid Pocket Wear: Check that the M2.5 clamping screw is completely clear of micro-debris and torqued to 0.9-1.2 Nm to prevent high force shifting.
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.