BEYOND S20R-SDWCR07 Internal Boring Bar 20mm Shank CNC Turning Tool Holder
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⚠️ 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-SDWCR07 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 compact 55-degree diamond DCMT0702 inserts in tight CNC lathe blocks?"
The BEYOND S20R-SDWCR07 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 0702-- indexable carbide inserts (such as DCMT 070204 / DCMT 070202). Machined from premium tempered alloy steel, the 20mm shank strikes the perfect balance between structural stiffness and micro-pocket capability, providing excellent chip clearance paths for deeper bore lines without tool deflection.
When paired with appropriate carbide geometries, this tool body supports inserts featuring an aggressive positive rake angle and custom molded chipbreaker troughs. These structural profiles split long, stringy chips into tight, manageable segments, ensuring fluid evacuation out of deep blind holes without packing or binding against the newly turned surface finish.
2. Product Core Features
- Hardened Structural Alloy Steel Shank: Heat-treated to HRC 42-45 to withstand complex deflection stresses in deep internal cavities.
- Heavy-Duty 20mm Shank with 7mm Compact Pocket: Maximizes body mass and dampens harmonics while maintaining the ability to accept micro-radius inserts for tight corner detailing.
- 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-SDWCR07
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
7mm Insert Edge Size
Looking for the Mirrored Left-Hand (L) Companion Unit for Your CNC Setup?
Explore the S20R-SDWCL07 (Left Hand) Tool Holder →3. Technical Specifications & Dimension Comparison
| Technical Variable | Metric Model (S20R-SDWCR07) | 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 070202 / DCMT 070204 Series | DCMT 21.50.5 / DCMT 21.51 industrial equivalence |
| Fasteners (Included) | M2.0 Pocket Screw + T6 Torx Key | M2.0 Hardened Screw + T6 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 | 0.04 - 0.15 mm/rev |
| Stainless Steel Grades (M-Class) | 90 - 180 m/min | 0.04 - 0.12 mm/rev |
| Cast Iron / Nodular Iron (K-Class) | 100 - 200 m/min | 0.05 - 0.18 mm/rev |
4. Industrial Applications
- High-Rigidity Small Bore Machining: Combines a massive 20mm shank body with a delicate 7mm insert seat, maximizing resistance to tool deflection when cutting narrow inner geometries down to 25mm.
- Chamber Copying and Fine Profiling: Specifically optimized for close-tolerance finish-boring operations across long internal horizons up to 75mm.
- Blind Hole Sweeping: Right-hand screw clamping configuration delivers maximum stability under heavy upward chip forces.
5. Equipment & Tooling Compatibility
- CNC Turning Centers: Matches seamlessly into 20mm round boring bar blocks or split reduction bushings on standard automated turrets.
- Conventional Engine Lathes: Mounts securely inside universal quick-change tool posts or multi-holder blocks.
- Global Insert Standardization: Engineered to rigid ISO specifications, guaranteeing an exact fit for 55° clearance DCMT 0702-- indexable carbide inserts across all major tool manufacturers.
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
Franklin B. — United States
"The combination of a hefty 20mm shank body with the tiny DCMT 0702 insert is exactly what I needed. No flexing at all on deep inner bores. Absolute game changer."
Hans W. — Germany
"Hervorragende Qualität. The right-hand configuration mounts perfectly in our standard turret setup. Rigid finish on our alloy runs."
Matteo R. — Italy
"Gambo solido e lavorazione pulita. Excellent value for automated production lines looking for low micro-vibration performance."
Yukihiro N. — Japan
"07サイズチップのポケット加工精度が素晴らしい。 The insert seats dead flat with zero micro-movement during tight profiling cycles."
Sean M. — Australia
"Locks up solid in my block. Black oxide handles chips rubbing at depth nicely without wearing down the head."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the maximum safe boring depth extension for this 20mm steel body?
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**. Because this model uses a smaller 7mm insert, force limits are reduced, making micro-chatter highly unlikely within this overhang window.
Q2: Can I mount DCMT 11T3 series inserts into this tool holder?
A2: **No.** This pocket is machined specifically for the smaller **DCMT 0702--** series inserts (7mm cutting edge length). Attempting to use a larger DCMT 11T3 insert will not fit and will permanently compromise the pocket pocket seat.
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 traditional forward spindle setups ($M03$) when approaching from the front side of the workpiece. It ensures the cutting forces are driven down into the machine bed for optimal stability.
9. Technical Maintenance & Diagnostic Guidelines
Equivalent Industry Models
Interchangeable with global industrial metrics standard coding **S20R-SDWCR07**. 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 M2.0 clamping screw is completely clear of micro-debris and torqued to 0.5-0.6 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.