BEYOND S20R-SDWCR11 Internal Boring Bar 20mm Shank CNC Turning Tool Holder
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✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
⚠️ 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).
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.