BEYOND S20R-SDWCL07 Internal Boring Bar 20mm Shank CNC Turning Tool Holder
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💰 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-SDWCL07 Precision Internal Boring Bar & CNC Lathe Tool Holder
1. Product Overview
Engineers Search: "Which rigid 20mm left-hand boring bar cuts smooth internal diameters using compact 55-degree diamond DCMT0702 inserts in tight CNC lathe blocks?"
The BEYOND S20R-SDWCL07 is a high-precision, screw-on internal boring bar specifically engineered for left-hand (L) 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-SDWCL07
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
Left Hand Orientation
7mm Insert Edge Size
Looking for the Mirrored Right-Hand (R) Companion Unit for Your CNC Setup?
Explore the S20R-SDWCR07 (Right Hand) Tool Holder →3. Technical Specifications & Dimension Comparison
| Technical Variable | Metric Model (S20R-SDWCL07) | 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: Left-hand screw clamping configuration delivers maximum chip clearing room for fluid, continuous chip ejection.
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 left-hand configuration clears out long chips perfectly from internal shoulders under heavy coolant pressure."
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 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 **S20R-SDWCL07**. 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).
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.