BEYOND S20R-SVJBR11 Internal Turning Tool Holder for VBMT 1103 Inserts
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ PLEASE NOTE: TOOL HOLDER ONLY
Carbide inserts shown in images are for demonstration purposes only and are NOT included. Please order compatible inserts (VBMT 1103 / VCMT 1103) separately.
BEYOND S20R-SVJBR11 Internal Turning Tool Holder
1. Product Overview
User Query Context: "Which internal boring bar allows the best chip clearance and tool rigidity when machining a tight 93-degree shoulder inside medium-carbon steel using VBMT inserts?"
The BEYOND S20R-SVJBR11 is a professional-grade, indexable steel internal boring bar engineered for precision internal turning and profiling inside medium to large bores. Utilizing a highly stable screw-down clamping mechanism, it pairs perfectly with 35-degree rhombic VBMT 1103 or VCMT 1103 carbide inserts. Its geometry provides a 93° approach angle, which redirects cutting forces along the axis of the tool holder to drastically eliminate chatter and ensure seamless chip evacuation during deep internal profiling in steel, alloy, and stainless steel workpieces.
2. Product Key Features
- Premium Cr-Mo Alloy Steel Body: Forged from high-tensile chromium-molybdenum alloy steel and quenched to HRC42-45 to maintain supreme rigidity and structural stability under heavy mechanical stress.
- Optimized 93° Lead Angle: Specially calculated clearance angle for seamless internal 90-degree step profiling, allowing the tool to turn profiles without rubbing against the workpiece walls.
- Stable Screw-Down Clamping: Features a low-profile pocket design that clamps the insert tightly down using an alloy screw, preserving continuous structural alignment during aggressive cuts.
- Anti-Vibration Coating: Coated with a specialized industrial matte finish that dampens high-frequency harmonic vibrations, directly extending insert edge life.
3. Technical Specifications & Cutting Parameters
Model Designation Nomenclature Decoder
Steel Shank
20mm Shank
200mm Length
Separator
Screw Clamp
35° Insert Geometry
93° Lead Angle
Normal Clearance
Right-Hand Tool
For VBMT 11..
| Specification Metric | Metric Value | Inch Equivalent System | Inch Value |
|---|---|---|---|
| Model Number | S20R-SVJBR11 | ANSI / Inch Model | A12R-SVJBR3 |
| Shank Diameter (d) | 20 mm | Shank Diameter (Inch) | 0.750" (3/4 inch) |
| Overall Length (L) | 200 mm | Overall Length (Inch) | 7.87" |
| Minimum Bore (D min) | 25 mm | Minimum Bore (Inch) | 0.984" |
| Compatible Insert | VBMT 1103.. / VCMT 1103.. | ANSI Insert Designation | VBMT 33.. |
Recommended Cutting Parameters
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon/Alloy Steel (P) | 120 - 250 m/min | 0.08 - 0.22 mm/rev | 0.2 - 1.5 mm |
| Stainless Steel (M) | 90 - 180 m/min | 0.05 - 0.15 mm/rev | 0.2 - 1.2 mm |
Looking for matching high-performance turning inserts?
🛒 Browse Compatible VBMT 1103 Inserts Collection4. Product Applications
The S20R-SVJBR11 boring bar is specifically designed for high-precision manufacturing workflows:
- 90-Degree Square Shoulder Boring: The 93° lead allows seamless internal step turning and blind hole boring.
- Internal Copy Turning: Excellently routes complex internal geometries and profiles without tool body interference.
- Target Fields: Extensively utilized in automotive drivetrain machining, hydraulic valve cylinders, aerospace sleeve components, and custom job shop production.
5. Compatibility Guide
- CNC Turrets & Tool Posts: Directly locks into standard CNC block turrets, block sleeves, or traditional engine lathe quick-change tool posts that support 20mm round shanks.
- Insert Profiles: Standardized pocket matches all universal VBMT 110302, VBMT 110304, VBMT 110308, and VCMT 110304 insert designations.
6. BEYOND Premium Grade Comparison Matrix
Optimize your internal lathe operations by pairing the S20R-SVJBR11 with our specialized carbide insert substrate grades:
| BEYOND Carbide Grade | Coating Technology | Primary Application Field | Hardness Range |
|---|---|---|---|
| BY8150 | Nano-PVD TiAlN | Universal Steel Finishing to Medium-Duty Machining | HRC 20 - 45 |
| BY8200 | Thick CVD TiCN + Al2O3 | High-Speed Continuous Turning & Light Interrupted Cuts | HRC 25 - 50 |
| BY9030 | Premium PVD AlTiCrN | Austenitic Stainless Steels, Inconel & High-Temp Alloys | HRC ≤ 38 |
7. Why Choose BEYOND CNC Tools
BEYOND specializes in manufacturing industrial metal cutting tools that bridge the gap between premium performance and accessible pricing. Engineered with tightly controlled insert pocket dimensions, our tooling lines effortlessly interchange with legacy international standards to keep your machine cycle times low and productivity high.
Global Customer Reviews (Verified Machine Shops)
"Perfect Pocket Tolerances"
The insert sits absolutely flat in the seat. No micro-movements even during medium roughing passes on 1045 steel. Solid tool bar.
— Garrett D., United States 🇺🇸"Sehr gute Oberflächengüte"
Excellent dimensional stability. Swapped out our previous sandvik bar for this on our production line, and it holds the exact same index values.
— Ulrich H., Germany 🇩🇪"Robusto e preciso"
Very tough steel shank. Clears out chips reliably through the internal channel configuration. Delivery was prompt.
— Matteo B., Italy 🇮🇹"びびりが無く安定している"
Beautiful anti-chatter performance. Kept our internal bore dimensions within a 0.015mm tolerance window over long part runs.
— Takashi N., Japan 🇯🇵"Excellent Value for Money"
Hardware package included is heavy-duty. Screw threads are clean, holds standard indexable VBMT 332 inserts perfectly fine.
— Robert K., Canada 🇨🇦8. Expert Engineering FAQ
❓ Q1: What makes the 93° lead angle on the SVJBR bar distinct from an SVQBR bar?
💡 A: The SVJBR profile features a 93° approach angle, perfect for clearing square 90-degree internal steps and deep through-boring with minimal radial deflection. SVQBR uses a 107.5° angle primarily designed for specific backward or copy-profiling routines.
❓ Q2: What chipbreaker geometry works best with this internal boring tool holder?
💡 A: For finishing routines, choose a positive-rake chipbreaker with a tight groove geometry (like our -HF/-EF lines) to break up thin stringy chips inside narrow bores. For general medium roughing, select an all-around -PM/-HM style chipbreaker.
❓ Q3: How far can I safely extend the S20R shank out from the tool holder turret block?
💡 A: For standard steel-shank boring bars, the recommended maximum overhang limit is up to 3 times the shank diameter (equal to $60\text{ mm}$ for this 20mm tool). Extending past this window increases the risk of harmonic chatter patterns.
💡 Technical Maintenance & Troubleshooting Advice
Equivalent Model Cross-Reference: Sandvik Coromant: A20S-SVJBR11 | ISCAR: A20R-SVJBR-11 | Kennametal: A20SSVJBR11D | Walter Tools: A20R-SVJBR11
Troubleshooting Deflection & Chatter: If you notice micro-vibrations appearing on your workpiece internal bore walls, try decreasing the corner radius of your carbide insert (from a 0.4mm down to a 0.2mm configuration). This significantly reduces the contact area and dampens radial pushback force.
All BEYOND production tool holder bars go through rigorous dimensional inspections before leaving the line. Always clean out the pocket with compressed air before seating a new insert.
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.