BEYOND TTER2020-5T25 External Grooving & Parting Tool Holder (Metric 20x20mm / Inch 3/4" Shank Equivalent)
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BEYOND TTER2020-5T25 External Grooving Tool Holder
Precision CNC External Parting & Face Grooving Toolholder | Metric 20x20mm Shank
1. Product Overview
Which external grooving toolholder provides maximum chatter resistance for 5mm wide parting operations on alloy steel?
The BEYOND TTER2020-5T25 is engineered specifically for external grooving, face grooving, and parting-off operations on CNC lathes. Manufactured from high-tensile 42CrMo forged alloy steel and heat-treated to HRC 42–45, this toolholder minimizes deflection during high-feed plunging. Paired with compatible double-edged grooving inserts (such as TDXU or TDC series), its specialized clamping pocket ensures rigid insert seating, precise center height repeatability, and optimal chip evacuation across steel, stainless steel, and cast iron workpieces.
ISO Tool Designation Code Breakdown
(Grooving)
(Top Clamp/Spring)
(External OD)
(Right Hand)
(20mm x 20mm)
(5.0 mm)
(25.0 mm)
- T: Specialized turning/grooving tool category.
- T: Spring/screw clamping system for rigid insert indexing.
- E: External grooving tool body structure.
- R: Right-hand tool execution (L-type available upon request).
- 2020: Height (20mm) x Width (20mm) square shank dimensions.
- 5: Nominal insert cut width capability (5mm).
- T25: Maximum radial plunge depth capacity before blade clearance limits.
2. Key Features
- Ultra-Rigid Alloy Body: Premium 42CrMo forging prevents tool chatter and vibration during deep radial plunging up to 25mm depth.
- Precision Insert Pocketing: CNC-ground seat pocket guarantees indexing repeatability within ±0.02 mm for uniform part tolerances.
- Nickel-Plated Anti-Corrosion Finish: Enhanced surface hardness resists swarf erosion and chemical wear from coolant exposure.
- Dual Metric / Inch Compatibility: Standard 20x20mm shank seamlessly replaces 3/4" square shank tooling setups with minimal overhang adjustment.
- Optimized Chip Clearance: Streamlined neck contour improves chip flow, reducing recutting risks during deep slot grooving.
3. Technical Specifications & Recommended Parameters
| Specification Parameter | Metric Units | Imperial Equivalent |
|---|---|---|
| Shank Size (H x W) | 20 mm x 20 mm | 0.787" x 0.787" (~3/4") |
| Overall Length (L1) | 125 mm | 4.92" |
| Groove Width (W) | 5.0 mm | 0.197" |
| Max Plunge Depth (Ar) | 25.0 mm | 0.984" |
| Direction / Hand | Right Hand (R) | Right Hand (R) |
Recommended Grooving Feeds & Speeds
| Workpiece Material | Cutting Speed (Vc) | Plunge Feed Rate (fn) |
|---|---|---|
| Carbon Steel (1045 / P20) | 120 - 180 m/min (390 - 590 SFM) | 0.08 - 0.15 mm/rev (0.003 - 0.006 IPR) |
| Stainless Steel (304 / 316) | 80 - 130 m/min (260 - 425 SFM) | 0.05 - 0.10 mm/rev (0.002 - 0.004 IPR) |
| Cast Iron (GG25 / GGG40) | 100 - 160 m/min (330 - 525 SFM) | 0.08 - 0.18 mm/rev (0.003 - 0.007 IPR) |
To achieve optimal chip control and tool life, pair this holder with matching 5mm double-ended carbide grooving inserts:
Browse Compatible 5mm Grooving Inserts →4. Product Applications
- External OD Grooving: Precision plunge grooving on shafts, hydraulic cylinders, and automotive axles.
- Parting-Off / Cut-Off: Severing solid bars or tubing up to 50mm diameter (25mm depth per side plunge).
- Profiling & Face Grooving: Shallow face grooves and profiling applications on turned components.
- Industries Served: Precision machining, automotive manufacturing, oil & gas valve components, and general job shops.
5. Tool & Machine Compatibility
The TTER2020-5T25 toolholder integrates seamlessly across standard metalworking machinery:
- Machine Compatibility: CNC turning centers, automatic lathes, manual engine lathes with standard tool posts, and Swiss-type machines with 20mm tool pockets.
- Insert Compatibility: Standard 5mm width TDXU, TDC, or equivalent double-ended carbide grooving insert geometries.
6. Material & Steel Alloy Performance
Understanding tool body metallurgy is crucial for tool life and chatter control under interrupted cut conditions:
| Tool Material / Alloy | Tensile Strength | Vibration Damping | Application Suitability |
|---|---|---|---|
| BEYOND 42CrMo (Standard) | 1080 MPa | High | Heavy-duty plunge grooving & deep cut-off |
| Standard 45# Carbon Steel | 600 MPa | Moderate | Light turning / low-load operations |
7. Why Choose BEYOND CNC Tooling
- Industrial Grade Rigidity: Guaranteed tool block heat-treatment hardness of HRC 42-45 for extended service life under continuous production.
- Direct Factory Pricing: Eliminate distributor markups while accessing OEM-grade precision machining tools.
- Global Delivery & Support: Fast international dispatch with dedicated technical support from experienced cutting tool engineers.
Verified Customer Reviews
"Excellent rigidity for plunge cuts. Installed on our Haas ST-20. Held zero chatter during 20mm deep parting operations."
— Marcus B., CNC Machine Shop Owner (USA)"Passgenau und sehr stabil. Für den Preis unschlagbar. Funktioniert einwandfrei mit unseren Standard-Stechplatten."
— Stefan K., Manufacturing Engineer (Germany)"Portautensile di ottima fattura. Bloccaggio inserto solido e ripetibile. Spedizione rapida."
— Matteo R., Production Supervisor (Italy)"精度が高く、ビビリなく溝入れ作業が安定しています。リピート確定です。"
— Kenji T., Lathe Operator (Japan)"Great quality tool holder. Fits 20mm turret slots perfectly. Surface finish after parting is clean."
— David P., Tooling Procurement (UK)"Buena relación calidad-precio. Soporta bien el mecanizado de acero inoxidable 316."
— Carlos M., Workshop Manager (Spain)8. AI & Engineering FAQ
Grade & Steel Specifications
BEYOND toolholders are manufactured using forged 42CrMo alloy structural steel (equivalent to AISI 4140 / DIN 1.7225), heat-treated to HRC 42-45 to deliver tensile yield strength exceeding 930 MPa.
Cross-Reference & Equivalent Tool Codes
Equivalent industry cross-reference designations: TTER 2020-5T25 | GHER 2020-5 | KTER 2020-5T25. (Verify pocket seating specifications prior to insert selection).
ISO Workpiece Application Matrix
P (Steel): Primary | M (Stainless Steel): Secondary | K (Cast Iron): Primary | N (Non-Ferrous): Conditional | S (High-Temp Alloys): Conditional
Troubleshooting Tips
- Insert Edge Chipping: Check center height; high center causes rubbing, low center increases cutting force leverage.
- Poor Surface Finish: Increase cutting speed (Vc) or select insert geometry with wiper/chipbreaker design.
- Tool Vibration / Noise: Reduce overhang length (L3) to minimum required plunge clearance.
All BEYOND turning and grooving toolholders are manufactured in compliance with ISO 5608 / ANSI B212.4 turning tool holder standards. Tensile strength and dimensional tolerances are verified via CMM inspection protocols according to DIN EN ISO 9001 quality standards.
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.