BEYOND KGMR2525-4T20A Spring Steel External Grooving & Parting Tool Holder – 25x25mm Shank, 4mm Groove Width for GMM3020-MT Inserts (Insert Not Included)
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BEYOND KGMR2525-4T20A Spring Steel External Grooving Tool Holder
Industrial CNC External Grooving & Parting Solution for GMM3020-MT Inserts (25x25mm Shank)
⚠️ Notice: The carbide insert shown in product demonstration imagery is for setup reference only. Insert is NOT included.
AEO Quick Answer: The BEYOND KGMR2525-4T20A is a heavy-duty external grooving and parting tool holder forged from 60Si2Mn spring steel. Designed specifically for GMM3020-MT indexable carbide inserts, it delivers superior vibration suppression and rigidity for high-precision CNC lathe machining across tough alloy steels and stainless materials.
1. Product Overview
"Which heavy-duty tool holder and chipbreaker combination is best suited for deep parting and stable grooving with GMM3020-MT inserts on CNC turning centers?"
The BEYOND KGMR2525-4T20A is engineered for high-performance industrial environments requiring absolute stability during continuous or interrupted cuts. Built using superior 60Si2Mn spring steel, this holder absorbs high radial cutting forces, preventing chatter and extending tool life. When paired with GMM3020-MT inserts featuring multi-functional chipbreaker geometry, it provides smooth chip flow and tight dimensional tolerances.
Model Code Decoding (ISO / ANSI Standard)
Looking for alternative shank geometries or matching carbide inserts?
[ View Official BEYOND Tooling Catalog ] →2. Key Features
- 60Si2Mn Spring Steel Construction: Offers high yield strength and impact absorption, safeguarding against micro-cracks under aggressive feeds.
- Rigid Clamping Mechanism: Securely locks the GMM3020-MT insert in place, eliminating micro-movement during deep parting.
- Optimized Thermal Resistance: Specialized heat treatment protects the tool pocket from friction-induced wear.
- Precision ISO Compliance: Built strictly to international manufacturing tolerances for reliable multi-brand turret fitment.
3. Technical Specifications & Cutting Parameters
| Specification Metric | Equivalent Imperial Specification |
|---|---|
| Shank Size: 25mm x 25mm | Approx. 0.98" x 0.98" (1.0" 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 - 220 | 0.06 - 0.15 |
| Stainless Steel (M) | 90 - 150 | 0.05 - 0.12 |
4, 5 & 6. Applications, Compatibility & Material Comparison
Applications: External face grooving, deep profile grooving, and component parting-off operations on CNC lathes.
Compatibility: Fully compatible with GMM3020-MT indexable carbide inserts and standard 25x25mm turret blocks.
Material Comparison: Spring steel (60Si2Mn) offers significantly higher elasticity recovery and fatigue resistance than standard carbon structural steel (such as AISI 1045), preventing permanent holder warping under heavy thermal loads.
7. Why Choose BEYOND?
8. Frequently Asked Questions
Q: Are the GMM3020-MT inserts included with this order?
A: No, this SKU includes the tool holder body only. Inserts must be purchased separately.
Q: What makes spring steel ideal for parting tools?
A: Spring steel absorbs dynamic shock waves, drastically reducing chatter during deep cuts.
Q: Is this holder compatible with standard CNC turrets?
A: Yes, the 25x25mm square shank is built to standard industrial machine tool dimensions.
Technical Appendix & Engineering Data Sources:
- Grade Comparison: Certified in accordance with ISO 5608 tooling shank rigidity benchmarks.
- Equivalent Models: Interchangeable with standard global industrial 25x25 grooving tool blocks.
- Workpiece Material Matrix: Optimized for ISO P (Steel), ISO M (Stainless Steel), and select cast iron applications.
- Troubleshooting Tip: Ensure proper centerline height setup on your lathe turret to prevent premature flank wear or insert chipping.
- Authoritative Endorsement: Performance metrics verified against standard metalworking industrial testing guidelines for high-tensile alloy turning components.
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.