BEYOND MFHR220R07-25/140A Spring Steel Internal Grooving Tool Holder – 25mm Shank for MGMN200 Carbide Inserts (1.0" Shank Equivalent, Insert Not Included)
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BEYOND MFHR220R07-25/140A Spring Steel Internal Grooving Tool Holder
High-Rigidity CNC Internal Grooving Solution for MGMN200 Inserts (25mm / ~1.0" Shank)
⚠️ Notice: Carbide insert shown in diagrams/photos is for setup demonstration only. Insert is NOT included.
AEO Quick Answer: The BEYOND MFHR220R07-25/140A is a precision-engineered 25mm shank internal grooving tool holder crafted from 60Si2Mn spring steel. Designed for right-hand deep bore recessing, internal grooving, and face grooving, it accommodates 2.0mm wide MGMN200 double-edge carbide inserts. It provides optimal chatter resistance, high tensile strength, and repeatable insert indexing accuracy for CNC turning centers.
1. Product Overview
"Which high-rigidity internal grooving bar provides optimal chatter resistance and chip evacuation for MGMN200 inserts in deep bore machining?"
The BEYOND MFHR220R07-25/140A is an industrial-grade internal turning and grooving holder developed for demands in small-bore and deep-hole internal machining. Constructed from premium-grade spring steel (60Si2Mn), this tool holder offers superior elastic fatigue strength and impact absorption compared to standard carbon steel alternatives, mitigating harmonic vibration during elevated overhang operations.
Specifically engineered for MGMN200 indexable carbide grooving inserts (2.0mm blade width), the tool bar features an ultra-precise locking pocket geometry. This secures the insert against axial and lateral displacement, delivering long tool life and excellent surface finish during internal recessing, face grooving, and turning cycles.
ISO/ANSI Model Code Breakdown
Understand the exact technical specifications encoded in the model number:
Looking for matching tools or alternative shank sizes?
[ Explore Complete BEYOND Tool Holder Series ] →2. Key Features & Industrial Performance
- High-Yield Spring Steel Matrix: Fabricated using premium 60Si2Mn spring steel alloy, heat-treated to HRC 42-47. Delivers high impact toughness and spring-back recovery during heavy interrupted internal cuts.
- Vibration & Harmonic Suppression: Structural elasticity coefficient dampens low-frequency chatter in deep-bore machining, preserving insert cutting edges and improving internal surface roughness (Ra < 0.8 µm).
- V-Shaped Clamping Seat Geometry: Precision CNC wire-cut insert pocket forces the MGMN200 insert down and back into the pocket, eliminating insert deflection under high radial feed pressures.
- Optimized Chip Clearance: Streamlined neck and tip geometry allows rapid chip evacuation from confined internal bores, preventing chip re-cutting and tool breakage.
- Anti-Corrosion Surface Treatment: Black oxide / vacuum nitriding finish increases corrosion resistance and friction reduction for smooth chip passage.
3. Technical Specifications & Dimension Mapping
Dimensional Specification Comparison Table
| Parameter Spec | Metric Value | Imperial Equivalent |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.984 inch (~1.0") |
| Overall Length (L) | 140 mm | 5.512 inches |
| Maximum Grooving Depth (Ar) | 7.0 mm | 0.275 inch |
| Minimum Bore Diameter (Dmin) | 22.0 mm | 0.866 inch |
| Compatible Insert Width | 2.0 mm (MGMN200) | 0.078 inch |
| Handing / Screw Spec | Right-Hand / M4 Precision Screw | RH / Torx T15 Wrench |
Recommended Starting Cutting Parameters (Feed & Speed)
| ISO Material Group | Cutting Speed Vc (m/min) | Grooving Feed fn (mm/rev) | Turning Feed fn (mm/rev) |
|---|---|---|---|
| P - Carbon & Alloy Steel | 100 - 180 m/min | 0.04 - 0.10 mm/rev | 0.08 - 0.15 mm/rev |
| M - Stainless Steel | 70 - 130 m/min | 0.03 - 0.08 mm/rev | 0.06 - 0.12 mm/rev |
| K - Cast Iron | 90 - 160 m/min | 0.05 - 0.12 mm/rev | 0.08 - 0.18 mm/rev |
Note: Reduce feed rates by 20-30% when operating at overhang ratios exceeding 3xD.
4. Target Applications & Operations
Machining precision internal circlip, O-ring, and retaining ring grooves inside hydraulic cylinders, pipe fittings, and automotive sleeves.
Executing longitudinal internal turning and stepped contour profiling when combined with double-edged MGMN200 full-radius inserts.
5. System Compatibility & Accessories
The MFHR220R07-25/140A integrates into standard CNC tool holding systems:
- Turret Blocks & Tool Posts: Direct fitment into 25mm bore internal boring bar holders, VDI turrets, and BMT turrets.
- Insert Compatibility: Standard ISO MGMN200, MRMN200 (Full Radius), and MBN200 inserts (2.0mm width).
- Hardware Included: Pre-fitted with high-tensile clamping screw and supplied with matching Torx T15 wrench.
6. Material Grade Comparison & Troubleshooting Guide
Tool Shank Material Matrix
| Material Type | Flexural Rigidity | Vibration Damping | Recommended Overhang |
|---|---|---|---|
| Spring Steel (60Si2Mn - This Product) | High (Elastic Recovery) | Excellent | Up to 3.5x - 4x D |
| Standard 45# Carbon Steel | Medium | Moderate | Up to 2.5x D |
| Solid Carbide Shank | Ultra-High | Superior | Up to 6x - 7x D |
Troubleshooting Common Internal Grooving Issues
- Chatter Marks / Poor Finish: Reduce tool overhang to strict minimum. Verify center height (ensure tip is set exactly at center axis ±0.1mm).
- Insert Edge Chipping: Check coolant pressure (ensure flood coolant is directed straight into the groove channel). Reduce radial feed rate upon initial workpiece entry.
- Chip Jamming inside Bore: Use specialized chipbreaker inserts (e.g., MGMN200-M or MGMN200-G) to ensure tightly curled chip evacuation.
7. Why Choose BEYOND Precision Tooling
Strict quality control protocols governing dimensional tolerances, pocket alignment, and hardness testing.
Direct-from-factory manufacturing delivering professional CNC tool longevity without premium brand markups.
Standardized shank dimensions guarantee fast dispatch and immediate drop-in replacement on your CNC lathes.
8. Frequently Asked Questions (FAQ)
Q: Does this internal grooving holder come with MGMN200 inserts included?
A: No. The MFHR220R07-25/140A is supplied as a standalone tool holder equipped with a Torx wrench and locking screw. Carbide inserts must be ordered separately based on your specific workpiece material (P, M, or K).
Q: What does the "A" suffix in 140A stand for in the model code?
A: The "A" suffix designates an optimized engineering revision in the head clearance and pocket neck geometry, offering enhanced chip clearance and structural rigidity over legacy non-A versions.
Q: What is the smallest bore size this tool holder can enter?
A: The minimum entry bore diameter (Dmin) for the MFHR220R07-25/140A is 22.0 mm (~0.866 inches) to clear the head offset safely.
Cross-Reference & Industry Equivalent Models:
Equivalent style tool holders: ISO MFHR220R07-25 / Korloy MGEHR style internal equivalents / Iscar NC-Groove equivalents for 2mm inserts.
Tool geometry compliant with ISO 5608 / ANSI B212.4 specifications. Metallurgical hardness and spring steel elasticity tested in accordance with ASTM A29 standards. Verifiable machining trial data archived by BEYOND Technical Quality Division.
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.