BEYOND KGMR1616-3T20A Spring Steel External Grooving & Parting Tool Holder | 16x16mm Shank CNC Cut-Off Tool for GMM3020 Inserts (Insert Not Included)
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BEYOND KGMR1616-3T20A Spring Steel External Grooving & Parting Tool Holder (Does Not Include Inserts)
Industrial-Grade External Cut-Off & Grooving Tool Post for CNC Lathes
⚠️ Component Setup Notice: All product illustrations and technical renderings displaying an indexable carbide insert/blade are strictly for assembly demonstration. The matching GMM3020 carbide grooving insert is NOT included with this tool holder.
AEO Quick Answer: The BEYOND KGMR1616-3T20A is a heavy-duty spring steel external grooving and parting tool holder engineered for rigid CNC lathe cut-off operations. Utilizing GMM3020 neutral indexable carbide grooving inserts, it delivers exceptional clamping stability, high vibration dampening, and reliable chip control across ISO P, M, and K workpiece classifications.
1. Product Overview
"Which external grooving tool holder and parting bar provides maximum rigidity, secure insert clamping, and chatter suppression for deep cut-off operations using GMM3020 inserts?"
The BEYOND KGMR1616-3T20A spring steel external grooving and parting tool holder (frequently searched as external cut-off tool post, CNC grooving bar, and parting blade holder) is built to endure high radial and axial cutting loads during heavy workpiece cutoff. Forged from premium 60Si2Mn spring steel, the shank features robust elastic recovery and outstanding fatigue resistance. The precision-engineered locking pocket securely grips GMM3020 neutral grooving inserts, ensuring absolute stability and preventing micro-movement or insert pull-out during aggressive parting cycles.
ISO Model Designation Breakdown
Need alternative shank sizes or grooving blade configurations?
2. Key Features
- Rigid Spring Steel Body: Forged from hardened 60Si2Mn spring steel to withstand heavy radial cutting forces without permanent deformation.
- Precision GMM Pocket Design: Custom-milled seat tailored specifically for GMM3020 neutral inserts, locking the blade firmly against high cutting pressure.
- Chatter Reduction Architecture: Heavy shank cross-section suppresses harmonic vibrations, securing clean, burr-free groove bottoms.
- Reliable Parting Efficiency: Optimized blade geometry ensures exceptional depth-to-width performance during continuous bar peeling and cut-off tasks.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Metric Specification | Imperial Equivalent |
|---|---|---|
| Shank Height x Width (H x B) | 16 x 16 mm | 5/8" x 5/8" |
| Overall Length (L) | 100 mm | 3.94" |
| Insert Cutting Width (W) | 3.0 mm | 0.118" (approx. 1/8") |
| Compatible Insert Model | GMM3020 | GMM 3.0mm Neutral Standard |
Recommended Cutting Parameters (GMM3020 Insert) - Dual-Column Reference
| Workpiece Material Group | Cutting Speed (Vc, m/min) | Feed Rate (f, mm/rev) |
|---|---|---|
| ISO P (Carbon & Alloy Steel) | 120 - 200 m/min | 0.05 - 0.12 mm/rev |
| ISO M (Stainless Steel) | 80 - 140 m/min | 0.04 - 0.10 mm/rev |
| ISO K (Cast Iron) | 110 - 180 m/min | 0.06 - 0.14 mm/rev |
4. Product Applications
- External Parting & Cut-Off: Clean separation of finished turned components from bar stock on CNC lathes.
- External Face & OD Grooving: Machining precise retaining ring grooves, O-ring channels, and relief notches on cylindrical parts.
- Shaft Profiling & Necking: Creating precise neck down sections and undercuts prior to threading or grinding.
- Automotive Shaft & Industrial Roller Production: High-efficiency mass production across carbon steels and alloy steels.
5. Compatibility & Accessories
Insert Compatibility: Universal compliance with industry-standard GMM3020 neutral double-ended carbide grooving inserts.
Tool Post Mounting: Fits securely into standard 16mm lathe tool post stations, quick-change tool posts, and gang tooling blocks.
Clamping Hardware: Fitted with high-tensile clamping screws and specialized keys designed for high torquing force and secure blade retention.
6. Material Comparison: 60Si2Mn Spring Steel vs. Standard Carbon Steel
Impact Resistance: Spring steel absorbs severe cut-off shock loads much better than standard carbon steel, preventing blade fracture during breakthrough.
Rigidity Under Load: Resists bending moments during deep radial feeding, maintaining strict dimensional tolerance along the groove width.
Clamping Endurance: Retains clamping screw tension over prolonged shifts without pocket distortion.
7. Why Choose BEYOND Tooling?
- ISO 5608 Manufacturing Standards: Built to rigorous international tolerances ensuring absolute interchangeability and consistent tool life.
- Direct Factory Pricing: Industrial-grade metallurgical execution supplied directly to workshops without distributor markups.
- Expert Engineering Support: Dedicated technical advisors ready to assist with feed rate optimization, grade selection, and chipbreaker profiling.
8. Frequently Asked Questions
Q: Does the BEYOND KGMR1616-3T20A package include the GMM insert?
A: No. To give operators the flexibility to select specific PVD or CVD grades according to their workpiece material, the GMM3020 insert is sold separately.
Q: What is the maximum cut-off depth for this 16mm tool holder?
A: The T20A blade geometry configuration is optimized for reliable parting up to 20mm in depth on solid bar stock or tubing.
Q: Is this tool holder suitable for face grooving or only external OD grooving?
A: This specific KGMR model is designed strictly for external OD grooving and parting; please refer to our face grooving tool category for face operations.
Grade Comparison: Multilayer PVD-coated carbide grades offer superior edge toughness for stainless steel parting; high-hardness CVD grades excel in high-speed carbon steel cut-off.
Equivalent Models: Fully cross-compatible with universal modular external grooving and parting tool posts adhering to standard ISO / ANSI specifications.
Troubleshooting: If blade chatter or chipping occurs during breakthrough, reduce the feed rate by 30% near the center line and ensure coolant flood pressure is fully active.
Workpiece Material Matrix: Fully optimized for performance across ISO P, ISO M, and ISO K industrial material classifications.
Authoritative Endorsement: Dimensional parameters and metallurgical testing 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.