BEYOND MCBNL2020K12 Left-Hand External Turning Tool Holder - M-Type
Price shown is a starting point. Contact us for a precise quote based on your requirements.
MCBNL2020K12
Professional Left-Hand M-Type External Turning Tool Holder
Brand: BEYOND | Origin: China | High-Rigidity Industrial Grade
⚠️ NOTICE: The tool holder includes all spare parts. Inserts (Blades) are NOT included.
Model Identification Guide
Clamping: Multi-lock
Shape: 80° Diamond
Approach: 75°
Clearance: 0°
Hand: Left Hand
20x20mm Shank
Length: 125mm
Insert: CNMG1204
Technical Specification & Spare Parts List
Detailed specifications for the MCBNR / MCBNL Series (All Sizes):
| Model Type (R/L) | Compatible Insert | Shank(hxb) | Shim | Pin | Clamp | Screw | Wrench |
|---|---|---|---|---|---|---|---|
| MCBNR/L 2020K12 | CNMG 1204xx | 20 x 20 | MC1204 | CTM617 | HL1813 | ML0625 | L3.0 |
| MCBNR/L 1616H12 2525M12 / 3232P12 |
16x16 / 25x25 / 32x32 | ||||||
| MCBNR/L 2525M16 / 3232P16 | CNMG 1606xx | 25x25 / 32x32 | MC1604 | CTM822 | HL2217 | ML0830 | L3.0/L4.0 |
| MCBNR/L 3232P19 | CNMG 1906xx | 32 x 32 | MC1904 | CTM1025 | HL2724 | ML1035 | L5.0 |
Cutting Data Recommendations
Carbon & Alloy Steel (P)
Cutting Speed (Vc): 160 - 280 m/min
Feed Rate (fz): 0.15 - 0.50 mm/r
Stainless Steel (M)
Cutting Speed (Vc): 120 - 210 m/min
Feed Rate (fz): 0.12 - 0.35 mm/r
Unit Reference & Shank Size Conversion
| Metric: 2020K12 (20mm) | Imperial Equivalent: 12-4C (3/4") | Metric: 1616H12 (16mm) | Imperial Equivalent: 10-4B (5/8") |
| Metric: 2525M12 (25mm) | Imperial Equivalent: 16-4D (1") | Metric: 3232P19 (32mm) | Imperial Equivalent: 20-4E (1-1/4") |
Global Verified Feedback
⭐⭐⭐⭐⭐ "The MCBNL2020K12 is extremely robust. Perfect for my left-hand turning operations. The 20mm shank is very stable." - Markus, Germany
⭐⭐⭐⭐⭐ "Fast shipping to UK. The M-type clamping is superior for heavy roughing. BEYOND quality is excellent." - Robert, UK
⭐⭐⭐⭐ "Good tool life and the accessories (shim, clamp) are high precision. Fits my CNMG inserts perfectly." - Jason, Canada
⭐⭐⭐⭐⭐ "Zero vibration at recommended feeds. Great value compared to big brands." - Liam, Australia
⭐⭐⭐⭐⭐ "The finish I get with this tool holder is impressive. Highly recommend the 20x20mm series." - S. Watanabe, Japan
Frequently Asked Questions (FAQ)
Q: What is the difference between MCBNR and MCBNL?
A: MCBNR is a Right-hand tool holder, while MCBNL is the Left-hand version. Both use the same 80° CNMG inserts.
Q: Is this holder suitable for internal boring?
A: No, this is an external turning tool holder. For internal work, please see our boring bar category.
Q: Does the holder come with a wrench?
A: Yes, all BEYOND tool holders include the appropriate wrenches and spare parts as listed in the technical table.
Industrial Clamping Guide:
Long-tail Search Keywords: MCBNL2020K12, CNC External Turning Tool, Left Hand Lathe Holder, CNMG12 Indexable Bar, BEYOND Tools China, 20mm Turning Shank.
© BEYOND Cutting Tools - Professional Industrial Machining Solutions.
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.