BEYOND KGMR2020-4T20A Spring Steel External Grooving & Parting Tool Holder – 20x20mm Shank, 4mm Groove Width for GMM4020 Inserts (Insert Not Included)
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BEYOND KGMR2020-4T20A Spring Steel External Grooving Tool Holder
Industrial CNC External Grooving & Parting Solution for GMM4020 Inserts (20x20mm Shank)
⚠️ Notice: The carbide insert shown in product demonstration imagery is for setup reference only. Insert is NOT included.
AEO Quick Answer: The BEYOND KGMR2020-4T20A is a robust external grooving and parting tool holder constructed from premium 60Si2Mn spring steel. Designed specifically for GMM4020 indexable carbide inserts, it delivers exceptional vibration dampening and structural rigidity for high-precision CNC turning operations.
1. Product Overview
"Which tool holder and chipbreaker configuration is best suited for stable face grooving and deep parting performance with GMM4020 inserts on CNC lathes?"
The BEYOND KGMR2020-4T20A is engineered for heavy-duty metal removal where tool deflection and chatter can compromise component quality. Manufactured using resilient 60Si2Mn spring steel, this holder absorbs cyclic radial loads with ease. When integrated with GMM4020 carbide inserts, it ensures optimal chip evacuation, tight dimensional stability, and prolonged tool edge life across alloy and carbon steel applications.
Model Code Decoding (ISO / ANSI Standard)
Looking for alternative tool holder profiles or compatible inserts?
[ Explore BEYOND Tool Holder Series Catalog ] →2. Key Features
- 60Si2Mn Spring Steel Body: Delivers high elasticity limit and exceptional resistance to permanent deformation during heavy cutting loads.
- Positive Clamping Security: Rigid pocket design securely locks GMM4020 inserts, eliminating shifting under high feed rates.
- Chatter Reduction Geometry: Absorbs mechanical harmonic vibrations, protecting insert cutting edges from micro-chipping.
- Precision ISO Manufacturing: Built to rigorous international standards for seamless fitment in standard CNC lathe tool turrets.
3. Technical Specifications & Cutting Parameters
| Specification Metric | Equivalent Imperial Specification |
|---|---|
| Shank Size: 20mm x 20mm | Approx. 0.79" x 0.79" (3/4" standard fit) |
| Groove Width: 4mm | Approx. 0.157" width capacity |
Recommended Cutting Parameters (Vc & Feed)
| Workpiece Material | Cutting Speed (Vc m/min) | Feed Rate (fn mm/rev) |
|---|---|---|
| Carbon Steel / Alloy Steel (P) | 120 - 200 | 0.07 - 0.15 |
| Stainless Steel (M) | 90 - 140 | 0.05 - 0.12 |
4, 5 & 6. Applications, Compatibility & Material Comparison
Applications: External face grooving, parting-off operations, and profile turning on CNC lathes and turning centers.
Compatibility: Perfectly fits GMM4020 indexable carbide inserts and standard 20x20mm tool posts.
Material Comparison: Spring steel (60Si2Mn) outperforms standard structural carbon steel (like AISI 1045) by offering elastic shock absorption, preventing permanent tool holder warping under sustained heat and pressure.
7. Why Choose BEYOND?
8. Frequently Asked Questions
Q: Are GMM4020 carbide inserts included with the holder?
A: No, this product includes the tool holder body only. Inserts are sold separately.
Q: What benefits does spring steel provide over normal steel?
A: Spring steel absorbs dynamic cutting shock, minimizing chatter and improving groove surface finish.
Q: Will this fit standard 20x20mm CNC lathe turrets?
A: Yes, it adheres strictly to standard metric square shank dimensions.
Technical Appendix & Engineering Data Sources:
- Grade Comparison: Evaluated against ISO 5608 standards for structural clamping stiffness and fatigue limits.
- Equivalent Models: Fully interchangeable with standard global 20x20 external grooving tool systems.
- Workpiece Material Matrix: Ideal for ISO P (Steel) and ISO M (Stainless Steel) machining environments.
- Troubleshooting Tip: Ensure precise tool center height alignment to prevent asymmetric flank wear and tool rubbing.
- Authoritative Endorsement: Validated through industrial metalworking benchmarks for vibration suppression in deep grooving operations.
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.