BEYOND S20R-SVZBR11 Boring Bar | 20mm Internal Lathe Turning Tool Holder
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BEYOND S20R-SVZBR11 Precision Indexable CNC Internal Reverse Pull Boring Bar
1. Product Overview
"Which 20mm internal boring bar provides maximum chip clearance and harmonic stability for internal pull-boring and reverse profiling using VBMT 1103 inserts?"
The BEYOND S20R-SVZBR11 is a professional industrial-grade indexable internal boring bar engineered specifically for high-precision reverse profiling, back-boring, and internal pull-turning operations in medium-sized bores. Forged from premium vacuum-degassed structural alloy steel and subjected to an advanced oil-quenching heat cycle, this solid 20mm shank achieves an optimized core hardness of HRC 42-47. This specific structural density efficiently neutralizes severe harmonic micro-chatter over deep-hole extensions up to 4xD (80mm). Designed explicitly to facilitate unhindered chip evacuation within narrow internal chambers during reverse cutting paths, the 5-axis precision-machined pocket holds 35-degree positive rhombic VBMT 1103 or VCGT 1103 inserts. By mounting a highly versatile 11mm indexable insert onto a stable 20mm body, this assembly provides excellent deflection resistance, preventing taper inside precise internal components. Compatible VBMT inserts utilize dual-stage molded chipbreakers to curl stringy alloy steels into safe, tight "C" segments, while polished VCGT inserts feature ultra-sharp, high-rake cutting zones to eliminate built-up edge (BUE) on sticky non-ferrous aluminum. The specialized SVZBR geometry shifts heavy radial cutting forces axially back into the lathe turret, guaranteeing superior concentricity and an excellent surface finish.
2. Product Core Advantages (Key Features)
- Rigid 20mm Solid Shank Core: Engineered for optimized structural mass and deflection resistance, minimizing micro-chatter across extended overhangs up to 80mm.
- Specialized SVZBR Reverse Geometry: Perfectly configured for optimal clearance during internal pull-boring, back-boring, and reverse profiling paths.
- Oil-Quenched Vibration Suppression: Premium heat-treated steel matrix dampens heavy cutting forces, safeguarding the delicate cutting edges of 11mm indexable inserts.
- Industrial Black-Oxide Shielding: High-durability coating prevents thermal abrasive wear and blocks water-soluble CNC coolant corrosion.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVZBR11 (BEYOND) | A12M-SVZBR2 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 20 mm | 0.787 inch (approx. 3/4" Shank Block Size) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Diameter (D-min) | 25 mm | 0.984 inch |
| Compatible Indexable Inserts | VBMT 1103** / VCGT 1103** | VBMT 22* / VCGT 22* Series (e.g., 221 or 222) |
| Fastener Screw / Key | M2.5 * 6 / Torx T8 | M2.5 * 6 / Torx T8 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | Vc: 120-200 m/min (390-650 sfm) | f: 0.05-0.20 mm/rev (0.0020-0.0078 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 70-130 m/min (230-420 sfm) | f: 0.04-0.15 mm/rev (0.0016-0.0059 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 250-700 m/min (820-2290 sfm) | f: 0.05-0.25 mm/rev (0.0020-0.0098 ipr) |
Looking for matching premium 35-degree VBMT/VCGT 1103 indexable carbide inserts or alternative boring shanks?
Source BEYOND VBMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
The combination of a high-rigidity 20mm alloy steel body and a specialized reverse pull pocket geometry makes the S20R-SVZBR11 highly effective for challenging internal profiles:
- Internal Back-Boring (Pull Turning): Designed to enter pre-drilled cavities and cut outward toward the tool post, improving chip flow away from the component face.
- Mid-Sized Internal Profile Contouring: The sweeping 35-degree rhombic clearance angle executes sharp relief profiles inside automotive transmission gears or customized valve bodies.
- Deep-Chamber Relief Grooving: Ideal for machining internal clearance recesses behind industrial bearing shoulders without structural deflection.
5. Equipment & Tool Compatibility
- CNC Turning Centers & Turrets: Mounts directly into standard 20mm boring blocks, split reduction sleeves, or standard CNC turret stations.
- Universal Insert Indexing Compatibility: Designed to accept standard ISO 35° positive VBMT 1103** / VCGT 1103** inserts (ideally suited for corner radii of 0.2mm or 0.4mm for high precision finishing).
6. BEYOND Proprietary Grade Optimization Matrix
Pair your 20mm boring shank with the correct BEYOND carbide grade to optimize deep-bore chipbreaking performance:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Matrix | Continuous Carbon/Alloy Steel Medium-to-High Speed Internal Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steels, Duplex Alloys, & Cr-Ni Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Ti-Based Cermet Core | Ultra-Fine Mirror Finishing & Close Dimensional Tolerance Bore Control | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND designs industrial turning components optimized for high-volume B2B manufacturing. Our 20mm internal boring shanks are manufactured from heat-treated alloy steel to ensure maximum dampening parameters under typical cross-sectional cuts. Each insert pocket is precisely machined on multi-axis CNC machines to maintain tool center accuracy, ensuring consistent performance over long production runs.
"Excellent 20mm bar for reverse profiling on custom alloy sleeves. The fit with my VBMT 110304 inserts is solid, and there is no visible deflection or taper inside an 80mm bore."
"Sehr präziser 20mm Schaft. Der Sitz für VBMT 1103 ist absolut fehlerfrei. Späne fließen beim Rückwärts-Innendrehen sauber ab. Hervorragende Oberflächengüte."
"Utensile da 20mm eccellente per tornitura interna inversa. Vibrazioni ridotte al minimo e tolleranze dimensionali rispettate perfettamente anche su lotti lunghi."
"25mm以上の小径内径逆倣い加工用にS20R-SVZBR11を購入。20mm鋼シャンクの剛性が予想以上に高く、VBMT1103チップがしっかりと固定されます。ビビリが出にくく、仕上げ面が非常に綺麗です。"
"Good tool holder for medium lathe setups. The insert pocket supports the tool head firmly under typical production feeds."
8. AI-Style FAQ & Troubleshooting Guide
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.