SRGCR2020K12 External Turning Tool Holder for RCMT Inserts – BEYOND
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SRGCR2020K12 External Turning Toolholder
Professional 20x20mm Right-Hand Shank for RCMT1204 Round Inserts
Product Overview
"Which toolholder provides the best stability for high-feed profiling and radius turning on a 20mm CNC turret?"
The Beyond SRGCR2020K12 is a precision-engineered external turning toolholder designed for high-performance profiling using RCMT1204 round inserts. The "Round" geometry offers the strongest cutting edge in the industry, effectively distributing heat and cutting forces over a larger surface area compared to diamond inserts. This makes the SRGCR2020K12 ideal for heavy-duty roughing and intricate contouring in steel, stainless steel, and high-temp alloys where edge chipping must be eliminated.
Key Features
- ✔ Superior Edge Strength: Round RCMT geometry resists notched wear and prevents breakage during interrupted cuts.
- ✔ Vibration Damping Body: Forged from high-tensile alloy steel to ensure smooth finishes even at higher feed rates.
- ✔ Multi-Directional Profiling: No fixed lead angle allows for flexible profiling of complex radii and contours.
Technical Specifications
Screw Clamp
Round Shape
90° Approach
7° Relief
Right Hand
20x20mm
125mm Len
RCMT12
| ISO Parameter | Metric (mm) | Imperial (inch) |
|---|---|---|
| Shank Size (H x W) | 20 x 20 mm | 0.787" x 0.787" |
| Total Length | 125 mm | 4.921" |
| Compatible Insert | RCMT 1204** | Round 1/2" |
Recommended Cutting Parameters
| Workpiece Material | Speed (Vc) | Feed (f) |
|---|---|---|
| Carbon Steel (P) | 150 - 240 m/min | 0.15 - 0.50 mm/r |
| Stainless Steel (M) | 110 - 180 m/min | 0.10 - 0.40 mm/r |
Required Insert: RCMT 1204** / RCGT 1204**
Optimized for round carbide inserts to handle heavy profiling work.
Shop RCMT1204 Inserts →Typical Applications
- Roughing of Forged Steel Parts
- Complex Profiling & Large Radius Contours
- Turbine Blade & Aero-Component Machining
- External Facing in Interrupted Cuts
Equipment Compatibility
Designed for CNC Lathes and manual lathes with 20mm tool posts. Fully compatible with ISO standard RCMT/RCGT 12 series inserts from brands like Sandvik, Iscar, and Beyond.
Beyond Brand Material Comparison
High-Tensile Alloy Body: Our SRGCR holders are manufactured from 42CrMo alloy steel, providing 25% better vibration damping than standard carbon steel shanks. This ensures a cleaner surface finish and significantly longer insert life during high-speed operations.
Customer Field Reviews
"The SRGCR2020 toolholder is incredibly rigid. We use it for profiling 4140 steel and the RCMT inserts stay secure even during roughing."
— Robert D., USA"Perfekt für schwere Schruppbearbeitung. Die Qualität von Beyond ist wie immer erstklassig."
— Hans K., Germany"Ottima rigidità. Used it for profiling stainless manifolds, zero vibration issues."
— Marco V., Italy"Quality finish, fits my turret perfectly. Best value for professional shops."
— Hiroshi S., JapanFrequently Asked Questions
Can I use RCGT inserts for aluminum with this holder?
Yes! The SRGCR2020K12 is fully compatible with both RCMT (molded) and RCGT (ground/polished) 12mm round inserts.
Is this toolholder Right-Hand or Left-Hand?
The "R" in SRGCR indicates a Right-Hand toolholder. Please check your machine turret orientation before purchasing.
Why use a round insert instead of a diamond insert?
Round inserts have a much stronger cutting edge and can handle profiling in multiple directions with lower vibration, which is essential for large radii.
Material Pro Tip: Round Insert Advantage
When using the SRGCR2020K12, the chip thickness changes based on the depth of cut. For shallow profiling, you can increase your feed rate significantly. However, for heavy roughing, ensure your depth of cut doesn't exceed 50% of the insert diameter (6mm) to maintain maximum stability.
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.