BEYOND TTER2020-3T20 CNC Grooving Toolholder | 20mm (3/4") Shank
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BEYOND TTER2020-3T20 External Grooving & Parting Toolholder — 20mm × 20mm Shank, Max Cut Depth 20mm (Imperial Equivalent: TTER 12-3T20)
1. Product Overview
Customer Question Focus: "Which toolholder is best suited for high-precision external grooving, parting off, and profiling on medium-alloy steels with a 20mm (3/4 in) turret setup and 3mm insert width?"
The BEYOND TTER2020-3T20 is an industrial-grade, right-hand external grooving and parting-off toolholder engineered for CNC turning centers and manual lathes. Crafted from high-strength 42CrMo alloy steel and heat-treated to HRC 42–45, this toolholder minimizes dynamic deflection under severe radial cutting forces during plunge grooving operations.
Designed to accommodate 3.0mm width indexable carbide inserts (such as TD chipbreaker geometries), the rigid top-clamp screw mechanism delivers maximum clamping force, preventing insert lateral displacement during heavy side-turning and chatter-free face parting.
ISO / ANSI Standard Designation Breakdown: TTER2020-3T20
2. Product Key Features
- Premium 42CrMo Alloy Steel Body: Quenched and tempered to HRC 42–45 for maximum toughness, superior vibration damping, and resistance to thermal deformation during deep plunging.
- High-Rigidity Screw Clamping: Direct-down locking bolt distributes load evenly, extending insert edge life by up to 35% compared to friction-fit holders.
- Black Oxide Surface Finish: Provides outstanding corrosion resistance, reduced friction, and slick chip evacuation during deep grooving cycles.
- Sub-Millimeter Indexing Repeatability: Precision-milled seat pocket guarantees insert positioning accuracy within ±0.01mm (±0.0004 in).
- Dual Metric/Imperial Versatility: Direct fit for standard 20mm ISO block toolposts and 3/4" open tool positions.
This toolholder requires 3.0mm Width Indexable Grooving Inserts.
Click Here to View Compatible Grooving Carbide Inserts (TD..3 / TDC3 / TDM3)
3. Technical Specifications & Cutting Parameters
Metric vs. Imperial Specification Comparison
| Parameter | Metric Standard | Imperial Equivalent |
|---|---|---|
| Model Designation | TTER2020-3T20 | TTER 12-3T20 |
| Shank Height (H) × Width (B) | 20 mm × 20 mm | 0.787 in × 0.787 in (3/4" Toolholder) |
| Overall Length (L1) | 125 mm | 4.921 in |
| Insert Width (W) | 3.0 mm | 0.118 in (1/8" nominal groove) |
| Max Cut Depth (Ar) | 20 mm | 0.787 in |
Recommended Machining Parameters (Speeds & Feeds)
| Workpiece Material (ISO Group) | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| P — Carbon & Alloy Steel (1045, 4140) | 120 – 220 m/min (390 – 720 SFM) | 0.08 – 0.18 mm/rev (0.003 – 0.007 IPR) |
| M — Stainless Steel (304, 316L) | 90 – 160 m/min (295 – 525 SFM) | 0.06 – 0.14 mm/rev (0.002 – 0.005 IPR) |
| K — Cast Iron (GG25, Ductile) | 100 – 190 m/min (330 – 620 SFM) | 0.08 – 0.20 mm/rev (0.003 – 0.008 IPR) |
| N — Non-Ferrous (Aluminum 6061) | 250 – 500 m/min (820 – 1640 SFM) | 0.10 – 0.25 mm/rev (0.004 – 0.010 IPR) |
4. Industrial Applications
- External Parting & Cut-off: Clean separation of turned components from bar stock up to 40mm solid diameter (Dmax = 40mm).
- O-Ring & Circlip Ring Grooving: Machining precision seal channels and retaining ring slots to exact ISO tolerances.
- External Profiling & Contour Turning: Roughing and finishing complex stepped shafts using 3D chipbreaker grooving inserts.
5. Machine & Insert Compatibility
CNC Machine Tools: Mounts directly into standard 20×20mm CNC turret blocks, Swiss-type gang tool posts, quick-change toolposts (AXA/BXA holders with 3/4" capacity), and engine lathe tool posts.
Cross-Insert Interchangeability: Compatible with ISO standard 3mm grooving inserts including BEYOND TD..3, Korloy MGMN300, TaeguTec TDC3, Iscar GDM3, and Sandvik equivalent 3mm parting inserts.
6. Material Quality Comparison
| Property / Metric | BEYOND 42CrMo Steel Shank | Generic Carbon Steel (45#) Shank |
|---|---|---|
| Tensile Strength (Rm) | ≥ 1080 MPa | ≥ 600 MPa |
| Hardness Level | HRC 42 – 45 (Quenched & Tempered) | HRC 20 – 25 (Unhardened) |
| Chatter Resistance | High (Damps Resonance by 40%) | Low (Prone to Tool Chatter) |
7. Why Choose BEYOND & Verified Global Customer Reviews
"Bought 4 of these TTER2020-3T20 holders for our Haas ST-20 machines. Insert seating pocket accuracy is spot on. We ran 4140 pre-hardened steel at 160 m/min all week with zero pocket deformation. Excellent value."
"Die Passgenauigkeit der 20mm Vierkant-Schaft ist hervorragend. Top rigidity during parting off 35mm 316L stainless steel bars."
"Ottimo utensile per scanalatura. Used with MGMN300 inserts for deep grooving on hydraulic pistons. Zero vibration at 20mm max plunge depth."
8. Frequently Asked Questions (FAQ)
A: No. As per standard industrial practice, the TTER2020-3T20 package includes the 20×20mm tool shank, clamping screw, and adjustment key. Carbide inserts are selected separately based on workpiece material.
A: The letter "R" designates Right-Hand orientation (spindle running forward / main spindle operation), while "L" in TTEL indicates Left-Hand orientation.
A: The "3" designates compatibility with 3.0mm (0.118") insert width, and "T20" specifies the maximum depth of radial cut (Ar = 20mm).
• ISO 1832:2017 — Indexable inserts for cutting tools — Designation.
• ANSI B212.4-2002 — Standard for Cutting Tools — Identification System for Indexable Inserts.
• Machinery's Handbook (31st Ed.) — Speeds and Feeds for Metal Grooving & Cut-Off Operations (Industrial Press).
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.