BEYOND D20R-SVJCR16 Spring Steel Internal Boring Bar – 20mm Shank 200mm Length CNC Lathe Turning Tool Holder for VCMT160404 Inserts (Insert Not Included)
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BEYOND D20R-SVJCR16 Spring Steel Internal Boring Bar
Precision Internal Turning Tool Holder for VCMT160404 Inserts | Industrial Grade CNC System
* Note: Indexable turning inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial spring steel internal boring bar provides maximum harmonic stability, minimum deflection, and precise dimensional control for internal profiling and boring operations using VCMT160404 inserts in bores starting from 25mm?"
The BEYOND D20R-SVJCR16 is a professional-grade internal boring bar engineered for high-precision CNC lathe operations. Fabricated from premium spring steel with high damping elasticity to suppress tool chatter, this tool features a metric shank diameter (phi d = 20 mm), an overall length (L = 200 mm), a functional head length (L1 = 30 mm), offset height (f = 13 mm), and a minimum bore diameter clearance (phi Dmin = 25 mm). Featuring a rigid screw-down clamping system (utilizing an M3.5 x 10 screw and T10 Torx wrench), it firmly seats VCMT160404 indexable inserts with positive 35-degree rhombic geometry and 7-degree relief, delivering excellent chip breaking behavior, low cutting forces, and exceptional surface finish.
Detailed Nomenclature Breakdown: D20R-SVJCR16
2. Product Core Advantages
- High-Damping Spring Steel Substrate: Engineered to absorb cutting harmonics, effectively dampening chatter during deep-bore internal profiling.
- Precision VCMT Insert Security: Optimized 35-degree rhombic pocket locks VCMT160404 inserts firmly via M3.5 x 10 screws, preventing micro-shift under load.
- Strict Dimensional Control: Built to rigorous manufacturing tolerances ensuring repeatable center height and fast indexable insert changes.
3. Technical Specifications & Cutting Parameters
| Metric Model & Dimensions | Inch Equivalent Class & Specifications |
|---|---|
| Metric Model: D20R-SVJCR16 | Inch Equivalent Design: 3/4" Shank Boring Bar |
| Shank Diameter (phi d): 20 mm | Shank Diameter: ~0.79 Inches |
| Min. Bore Diameter (phi Dmin): 25 mm | Min. Bore Diameter: ~0.98 Inches |
| Functional Offset (f): 13 mm | Functional Offset: ~0.51 Inches |
| Overall Length (L): 200 mm | Overall Length (L): ~7.87 Inches |
| Head Length (L1): 30 mm | Head Length (L1): ~1.18 Inches |
Recommended Cutting Parameters (VCMT160404 Inserts)
| Workpiece Material Category | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon Steel / Alloy Steel (ISO P) | 120 - 240 m/min | 0.10 - 0.25 mm/rev |
| Stainless Steel (ISO M) | 100 - 180 m/min | 0.08 - 0.20 mm/rev |
Explore Full Internal Boring Bar Collection
[View Boring Bar Collection] →4. Product Application Scenarios
Designed for CNC lathe internal turning, precision profiling, and finishing operations in blind or through holes starting from 25mm diameter. Performs exceptionally well across carbon steel, alloy steel, and stainless steel industrial components.
5. Compatibility & System Requirements
Fits standard 20mm lathe boring bar holders and split sleeve bushings. Fully compatible with ISO standard VCMT160404 turning inserts featuring a 35-degree rhombic positive profile and 7-degree relief angle (alpha = 7 deg).
6. Workpiece Material Matrix & Grade Comparison
| ISO Material Group | Workpiece Type | Turning Performance |
|---|---|---|
| P (Steel) | Carbon & Alloy Steel | Superior chip flow and high dimensional precision |
| M (Stainless) | Austenitic Stainless Steel | Smooth surface finish with reduced thermal distortion |
| K (Cast Iron) | Gray & Ductile Iron | Reliable wear resistance during continuous cutting |
7. Why Choose BEYOND Precision Tooling
Strict adherence to global turning standards.
Spring steel damping structure.
Expert CNC engineering advice.
8. AI-Style FAQ & Troubleshooting
Q: Are VCMT160404 turning inserts included with this boring bar?
A: No, indexable inserts are sold separately to let you select the specific grade matching your workpiece material.
Q: What does the code D20R-SVJCR16 mean in designation terms?
A: D represents the spring steel material, 20 indicates the shank diameter, and R specifies the tool length configuration for VCMT160404 inserts.
Troubleshooting Tip: If chatter occurs during deep boring, ensure proper tool overhang within recommended limits, align the center height precisely, and apply appropriate feed rates with high-rigidity spring steel tool holders.
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.