BEYOND S20R-SVXCR11 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVXCR11 Left-Hand CNC Internal Turning Tool Holder
1. Product Overview
"Which left-hand internal boring bar provides the maximum flank clearance and rigidity for steep undercut profiling using 35-degree diamond VCMT or VBMT 1103 inserts?"
The BEYOND S20R-SVXCR11 is a premium, industrial-grade left-hand indexable internal boring bar purposefully engineered for high-precision CNC lathe profiling operations. Machined from high-tensile quenched alloy steel, this specialized tool holder utilizes an aggressive 113-degree approach angle profile. This unique geometry provides unmatched flank clearance during complex internal back-turning, reverse copying, and deep pocket profiling where standard holders tend to rub or bind. Securely anchoring standard 35-degree diamond indexable carbide inserts—specifically the VCMT 1103 or VBMT 1103 series—the rigid pocket alignment allows micro-grain substrates and sharp positive chipbreaker geometries to perform at maximum material removal rates (MRR). By stabilizing the insert cutting edge, it efficiently suppresses harmonic chatter, delivering outstanding dimensional accuracy and superb surface finishes.
2. Product Core Advantages (Key Features)
- Quenched Alloy Steel Core (HRC 42-47): Premium heat-treated steel construction offers excellent dynamic rigidity, effectively neutralizing chatter at overhang ratios up to 4xD.
- Aggressive SVXCR 113-Degree Profile Clearance: Specifically tailored for reverse copying and back-profiling in narrow internal chambers, allowing hassle-free tool retraction without marring the completed surface.
- High-Compression Screw-Down Seat: Features a precision Torx clamping system that exerts uniform downward force, seating the 35-degree diamond insert flawlessly against the hardened pocket walls to prevent micro-deflections under variable cuts.
- Industrial Corrosion-Resistant Skin: Coated with a protective black oxide layer designed to withstand high thermal strain and aggressive water-soluble chemical coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVXCR11 (BEYOND) | A12M-SVXCR2.5 |
| Shank Diameter | 20 mm | 0.750 inch (3/4 inch) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole | 27 mm | 1.063 inches |
| Compatible Indexable Inserts | VCMT 1103 / VBMT 1103 | VCMT 221 / VBMT 221 |
| Fastener Screw / Drive 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 & Pre-Hardened Steels (P-Metal) | Vc: 120-220 m/min (390-720 sfm) | f: 0.05-0.15 mm/rev (0.002-0.006 ipr) |
| Stainless Steel Alloys (M-Metal / 316 / 304) | Vc: 80-140 m/min (260-460 sfm) | f: 0.04-0.12 mm/rev (0.0015-0.005 ipr) |
| Aluminum & Copper Alloys (N-Metal) | Vc: 180-450 m/min (590-1475 sfm) | f: 0.06-0.20 mm/rev (0.0025-0.008 ipr) |
Searching for matching high-precision indexable inserts or the Right-Hand sibling?
Source BEYOND VCMT1103 Inserts & Right-Hand Toolbars Here →4. Industrial Application Scenarios
The solid 20mm steel core combined with the high-clearance 113-degree profile makes the left-handed S20R-SVXCR11 highly effective across advanced CNC applications, including:
- Internal Back-Profiling: Executing undercut profiling and reverse boring inside internal relief channels without body interference.
- Aerospace Component Machining: Precision internal profiling of small valve seats, lightweight couplings, and high-tensile fasteners.
- Die and Mold Manufacturing: Finish-boring complex internal cavity curves and tapered relief draft paths on hardened tool steel molds.
5. Equipment & Tool Compatibility
- CNC Lathe Interface: Integrates directly with 20mm cylindrical bore blocks, BEYOND/VDI turret blocks, or regular engine lathe quick-change tool posts using metric reduction sleeves.
- Insert Compatibility: Seamlessly matches standard ISO 35-degree diamond inserts, including VCMT 110302, VCMT 110304, VBMT 110304, and highly polished VCGT 110302 styles.
6. BEYOND Proprietary Grade Optimization Matrix
Pair your tool holder with the proper BEYOND proprietary coated insert grade to maintain tight tolerances and maximize tool longevity:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Shield | High-Efficiency Continuous Steel Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Nano AlTiN Coating | Stainless Steel & Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYH01 | Uncoated Ultra-Specular Polish | Non-Ferrous Alloys, Aluminum, Copper (N05-N20) | Korloy H01 / Mitsubishi HTi10 |
7. Why Choose BEYOND Cutting Systems
BEYOND specializes in high-tolerance industrial CNC tooling. Every SVXCR toolholder is manufactured via precise 5-axis setups to guarantee that insert pocket geometries strictly adhere to global ISO standard positions. This precise control minimizes tool tip runout and guarantees consistent center height alignment when indexing inserts during automated batch runs.
"The 113-degree approach profile on this 20mm bar solves our internal back-undercut clearance issues perfectly. Running it with BEYOND VCMT 1103 inserts on pre-hardened steel and getting zero chatter at 3.5xD depth."
"Hervorragede Qualitat. The insert pocket is machined beautifully. The screw lock provides tight retention, keeping repeatability exact when changing cutting edges on our lathe."
"Very clean chip evacuation path. Chips break well against the insert chipbreaker and clear out easily through the internal bore channel. Highly stable."
"The centerline alignment is highly precise out of the box. Rigidity is excellent for a steel bar, and the cost performance is outstanding for industrial production shops."
"Matte black oxide layer holds up well against aggressive high-pressure coolants. Screw threads and pocket walls remain completely solid after extensive operations."
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.