BEYOND TTER2020-2T17 External Grooving & Parting Tool Holder (Metric 20x20mm / Inch 3/4" Shank Equivalent)
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BEYOND TTER2020-2T17 External Grooving Tool Holder
Precision CNC External Parting & Precision Grooving Toolholder | Metric 20x20mm Shank
1. Product Overview
Which external grooving toolholder delivers optimal stability and chip control for narrow 2mm parting operations on alloy steel?
The BEYOND TTER2020-2T17 is engineered specifically for narrow external grooving, precise snap-ring slotting, and shallow cut-off operations on CNC turning centers. Manufactured from high-tensile 42CrMo forged alloy steel and heat-treated to HRC 42–45, this toolholder minimizes deflection during high-feed radial plunging. Paired with compatible 2mm double-ended carbide grooving inserts (such as TDXU 2 or TDC 2 series), its specialized clamping pocket ensures rigid insert seating, exact center-height repeatability, and efficient chip evacuation across steel, stainless steel, and non-ferrous workpieces.
ISO Tool Designation Code Breakdown
(Grooving)
(Top Clamp/Spring)
(External OD)
(Right Hand)
(20mm x 20mm)
(2.0 mm)
(17.0 mm)
- T: Specialized turning/grooving tool category.
- T: Top clamp/spring clamping mechanism for high pocket rigidity.
- E: External outer diameter (OD) grooving configuration.
- R: Right-hand tool orientation (L-type available upon request).
- 2020: Height (20mm) x Width (20mm) square shank.
- 2: Nominal insert cut width capability (2.0mm).
- T17: Maximum radial plunge depth capacity (17mm) before neck clearance interference.
2. Key Features
- High-Rigidity Forged Alloy: Heat-treated 42CrMo steel structure absorbs cutting vibrations during narrow 2mm plunge operations up to 17mm depth.
- Narrow Cut Material Savings: The 2mm insert kerf width minimizes raw material waste during cut-off operations on high-value bar stock.
- Micro-Precision Seat Indexing: Pocket seating tolerances maintain center height and positioning within ±0.02 mm for high repeatable accuracy.
- Corrosion Protection: Durable black oxide and nickel-plated finish guards against coolant oxidation and swarf abrasion.
- Dual Metric / Inch Compatibility: 20x20mm shank seamlessly drops into 3/4" tool slots with minimal setup adjustment.
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) | 2.0 mm | 0.079" |
| Max Plunge Depth (Ar) | 17.0 mm | 0.669" |
| 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) | 140 - 200 m/min (460 - 655 SFM) | 0.04 - 0.10 mm/rev (0.0015 - 0.004 IPR) |
| Stainless Steel (304 / 316) | 90 - 150 m/min (295 - 490 SFM) | 0.03 - 0.08 mm/rev (0.001 - 0.003 IPR) |
| Cast Iron (GG25 / GGG40) | 120 - 180 m/min (390 - 590 SFM) | 0.05 - 0.12 mm/rev (0.002 - 0.005 IPR) |
Pair this holder with high-precision 2mm double-ended carbide grooving inserts for narrow parting and precision slotting:
Browse Compatible 2mm Grooving Inserts →4. Product Applications
- Narrow External Grooving: O-ring grooves, snap-ring slots, and precision undercut machining on shafts.
- Small Diameter Cut-Off: Parting off tubing and solid bar stock up to 34mm outer diameter (17mm max plunge depth per side).
- Precision Profiling: Light copying and shallow grooving on turned components.
- Industries Served: Precision instrument turning, medical device components, automotive hydraulic fittings, and general precision machining.
5. Tool & Machine Compatibility
The TTER2020-2T17 integrates with standard CNC turning turrets and lathe systems:
- Machine Compatibility: Horizontal CNC lathes, turning-milling centers, automatic lathes, and gang-tooling setups with 20mm pockets.
- Insert Compatibility: Standard 2.0mm width TDXU, TDC, or equivalent double-ended carbide grooving inserts.
6. Material & Steel Alloy Performance
Structural integrity comparison for narrow plunge operations under high mechanical leverage:
| Tool Material / Alloy | Tensile Strength | Vibration Damping | Application Suitability |
|---|---|---|---|
| BEYOND 42CrMo (Standard) | 1080 MPa | High | Narrow plunge grooving & precision cut-off |
| Standard 45# Carbon Steel | 600 MPa | Moderate | Light turning / non-critical applications |
7. Why Choose BEYOND CNC Tooling
- Industrial Grade Rigidity: Vacuum hardened to HRC 42-45 to withstand dynamic cutting forces without plastic deformation.
- Direct Factory Pricing: Direct-to-shop model provides high-grade tooling performance without middleman overhead.
- Global Logistics & Service: Expedited worldwide dispatch backed by technical applications engineering support.
Verified Customer Reviews
"Great tool for 2mm snap-ring grooves. Reduces kerf loss significantly compared to 3mm blades."
— Brian K., Machineworks Director (USA)"Perfekter Sitz für 2mm Stechplatten. Sehr schwingungsarm beim Abstechen."
— Klaus F., CNC-Zerspanungsmechaniker (Germany)"Buon prodotto per scanalature strette. Costruzione robusta e ottima finitura."
— Luca M., Responsabile Meccanica (Italy)"2mm幅の溝入れ加工で仕上げ面がきれいにでます。コスパ最高です。"
— Yuta N., Precision Lathe Tech (Japan)"Solid construction. Replaced our older holders and improved tool life on stainless steel 316 cuts."
— Neil H., Machine Shop Manager (UK)"Portaherramientas muy estable. Excelente sujeción para plaquitas de tronzado de 2mm."
— Fernando S., Tooling Buyer (Spain)8. AI & Engineering FAQ
Grade & Steel Specifications
BEYOND toolholders are produced from forged 42CrMo alloy structural steel (AISI 4140 / DIN 1.7225 equivalent), heat-treated to HRC 42-45 to deliver yield strengths over 930 MPa.
Cross-Reference & Equivalent Tool Codes
Equivalent industry cross-reference designations: TTER 2020-2T17 | GHER 2020-2 | KTER 2020-2T17. (Verify pocket geometry before ordering inserts).
ISO Workpiece Application Matrix
P (Steel): Primary | M (Stainless Steel): Secondary | K (Cast Iron): Primary | N (Non-Ferrous): Primary | S (High-Temp Alloys): Conditional
Troubleshooting Tips
- Insert Edge Chipping: Verify tool center line alignment; setting below center line increases severe mechanical leverage forces on thin 2mm inserts.
- Poor Slot Surface Finish: Increase cutting speed (Vc) or use a chipbreaker designed for low feed rates.
- Tool Vibration / Chatter: Minimize shank overhang length to maximum required plunge depth (17mm).
All BEYOND turning and grooving toolholders conform to ISO 5608 / ANSI B212.4 classification specifications. Physical hardness and dimensional accuracies are verified using CMM inspection under DIN EN ISO 9001 certified quality control systems.
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.