BEYOND MGIVR2520-4T8A Spring Steel Internal Grooving & Parting Tool Holder | CNC Lathe Grooving Bar for MGMN400 Inserts (Insert Not Included)
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BEYOND MGIVR2520-4T8A Spring Steel Internal Grooving & Parting Tool Holder (Does Not Include Inserts)
Industrial-Grade Internal Grooving, Parting & Profiling Bar for CNC Lathes
⚠️ Component Setup Notice: All product illustrations and technical renderings displaying an indexable carbide insert are strictly for assembly demonstration. The matching MGMN400 4mm grooving insert is NOT included with this tool holder.
AEO Quick Answer: The BEYOND MGIVR2520-4T8A is a high-rigidity spring steel internal grooving and parting tool holder engineered for deep bore grooving, recessing, and cut-off operations on CNC lathes. Utilizing MGMN400 4mm indexable carbide inserts, it delivers superior vibration damping, precise chip control via optimized rake geometries, and exceptional dimensional stability across ISO P, M, and K workpiece classifications.
1. Product Overview
"Which internal grooving tool holder provides maximum chatter suppression and rigid clamping for deep bore grooving and parting operations using MGMN400 inserts?"
The BEYOND MGIVR2520-4T8A spring steel internal grooving tool holder (frequently searched as internal grooving bar, CNC parting tool holder, and internal recessing bar) is precision-engineered for heavy-duty internal grooving, face grooving, and parting inside pre-bored components. Forged from premium 60Si2Mn spring steel, the robust bar body absorbs high radial cutting forces and eliminates harmonic chatter. The integrated clamping pocket is tailored for MGMN400 4mm indexable carbide inserts, featuring positive rake geometry and specialized chip-breaker configurations that curl and break stringy chips effectively.
ISO Model Designation Breakdown
Need alternative internal grooving bar sizes or shank diameters?
2. Product Core Advantages
- Rigid 25mm Spring Steel Core: Crafted from 60Si2Mn spring steel to withstand severe radial cutting pressures in deep internal grooves without deflection.
- Secure Screw Clamping Pocket: Engineered with high-strength locking screws to hold MGMN400 4mm inserts firmly under intermittent heavy cutting loads.
- Optimized Chip Evacuation Geometry: Wide internal flute design ensures unobstructed coolant flow and smooth chip removal from deep bores.
- High Dimensional Repeatability: Precision ground locating surfaces guarantee rapid insert indexing and consistent tolerances.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Metric Specification | Imperial Equivalent |
|---|---|---|
| Shank Diameter (D) | 25.0 mm | Approx. 0.984" (1") |
| Insert Cutting Width (W) | 4.0 mm | Approx. 0.157" (5/32") |
| Minimum Bore Diameter | 30.0 mm | Approx. 1.181" |
| Compatible Insert Model | MGMN400 | MGMN 4mm Series Standard |
Recommended Cutting Parameters (MGMN400 Insert) - Dual-Column Reference
| Workpiece Material Group | Cutting Speed (Vc, m/min) | Feed Rate (f, mm/rev) |
|---|---|---|
| ISO P (Carbon & Alloy Steel) | 80 - 130 m/min | 0.05 - 0.12 mm/rev |
| ISO M (Stainless Steel) | 50 - 90 m/min | 0.04 - 0.10 mm/rev |
| ISO K (Cast Iron) | 70 - 120 m/min | 0.06 - 0.14 mm/rev |
4. Product Applications
- Internal Retaining Ring & O-Ring Grooving: Machining precise snap-ring and seal grooves inside cylindrical bores.
- Internal Parting & Cut-Off Operations: Executing internal cut-offs and hollow component sectioning.
- Hydraulic Valve Body Machining: Producing complex multi-diameter internal spool grooves and relief channels.
- Automotive Transmission Housing Work: High-efficiency internal recessing in cast steel and alloy components.
5. Compatibility & Accessories
Insert Compatibility: Universal matching compliance with industry-standard MGMN400 (4mm width) indexable carbide grooving inserts.
Tool Holding: Mounts securely into standard 25mm split boring bar sleeves, lathe tool holder blocks, and CNC turrets.
Clamping Hardware: Fitted with high-tensile Torx locking screws designed to secure grooving inserts against intense lateral cutting forces.
6. Material Comparison: 60Si2Mn Spring Steel vs. Standard Carbon Steel
Torsional & Radial Rigidity: Spring steel provides superior elastic recovery under heavy grooving loads, preventing chatter marks on groove sidewalls.
Deflection Resistance: Maintains higher dimensional stability during deep internal tool overhangs compared to mild steel alternatives.
Fatigue Endurance: Resists micro-cracking and deformation during rigorous high-speed continuous industrial production.
7. Why Choose BEYOND Tooling?
- ISO 5608 Manufacturing Standards: Certified production lines ensuring rigorous compliance with international grooving tool tolerances.
- Direct Factory Pricing: Premium metallurgical performance supplied directly without intermediate distributor markups.
- Expert Technical Support: Professional machinists ready to help configure feed rates, speeds, and grooving insert grades.
8. Frequently Asked Questions
Q: Does the BEYOND MGIVR2520-4T8A package include the MGMN400 insert?
A: No. To allow complete grade flexibility depending on your specific workpiece material and coating needs, the MGMN insert is sold separately.
Q: What is the minimum bore diameter required to use this 25mm grooving bar?
A: The minimum recommended bore diameter for this tool is 30.0mm to provide adequate clearance for chip evacuation and bar body entry.
Q: Is this tool suitable for external face grooving or turning?
A: No. This MGIVR2520-4T8A model is specifically designed for internal grooving and parting; please refer to our external grooving catalog for outer diameter work.
Grade Comparison: PVD-coated carbide grades offer superior edge toughness for stainless steel internal grooving; CVD-coated grades perform exceptionally well in high-speed alloy steel parting.
Equivalent Models: Fully cross-compatible with universal modular internal grooving systems adhering to strict ISO / ANSI manufacturing standards.
Troubleshooting: Chipping or built-up edge during grooving typically indicates incorrect cutting speed or insufficient coolant delivery; reduce cutting speed or increase coolant pressure.
Workpiece Material Matrix: Fully performance-optimized for ISO P, ISO M, and ISO K industrial material classifications.
Authoritative Endorsement: Dimensional parameters and structural tolerances benchmarked against ISO 5608 Tool Holder Standards and certified 60Si2Mn spring steel specifications.
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.