SRGCR2020K08 External Turning Tool Holder for RCMT Inserts – BEYOND
Price shown is a starting point. Contact us for a precise quote based on your requirements.
SRGCR2020K08 External Turning Toolholder
Precision 20x20mm Right-Hand Shank for RCMT0803 Round Inserts
Product Overview
"Which right-hand toolholder provides the best stability for heavy roughing and high-feed profiling on a 20mm shank CNC turret?"
The Beyond SRGCR2020K08 is an industrial-grade external turning toolholder designed specifically for RCMT0803 round inserts. Unlike traditional diamond-shaped inserts, the round geometry of the RCMT series offers the strongest cutting edge, distributing heat and pressure across a larger radius. This minimizes edge chipping and makes the SRGCR2020K08 the ultimate solution for machining forged parts, complex radii, and multi-directional contouring in steel and stainless steel.
Key Features
- ✔ High-Rigidity 42CrMo Steel: Forged for maximum tensile strength to eliminate vibration during high-load turning.
- ✔ Screw Clamping System: High-precision seat ensures zero insert displacement, allowing for consistent profiling accuracy.
- ✔ Versatile Geometry: The 90° approach angle combined with round inserts provides maximum flexibility for contouring.
Technical Specifications
Screw Clamp
Round Shape
90° Approach
7° Relief
Right Hand
20x20mm
125mm Len
RCMT08
| 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 0803** | Round 5/16" |
Recommended Cutting Parameters
| Material Group | Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Steel (P) | 160 - 240 m/min | 0.15 - 0.45 mm/rev |
| Stainless (M) | 110 - 180 m/min | 0.10 - 0.35 mm/rev |
Required Insert: RCMT 0803** / RCGT 0803**
High-performance round carbide inserts are mandatory for optimal profiling performance.
View Compatible Inserts →Common Applications
- Roughing Forged Steel Components
- Complex Radius & Profile Turning
- Turbine Blade & Flange Machining
- Continuous & Interrupted Cutting
Compatibility
Designed for CNC turrets with standard 20mm tool slots. ISO Standard geometry ensures seamless compatibility with RCMT/RCGT 08 series inserts from Beyond or other major brands.
Beyond Brand Material Comparison
High-Performance 42CrMo Body: Unlike budget carbon steel holders, Beyond uses premium 42CrMo alloy steel, quenched and tempered to HRC 42-45. This results in 30% higher fatigue resistance and superior damping capacity, extending your carbide insert life by reducing chatter during radius turning.
Customer Field Reviews
"Great stability on my CNC lathe. Profiling stainless shafts used to be a headache, but this holder with RCMT inserts fixed it."
— Robert D., USA"Präzise gefertigt. Die Schraubklemmung hält den Druck beim Schruppen sehr gut aus."
— Hans K., Germany"Ottima qualità del materiale. La finitura superficiale è eccellente anche ad avanzamenti elevati."
— Marco V., Italy"Very reliable for profiling high-hardness steel. Fast delivery to Tokyo."
— Takashi S., JapanFrequently Asked Questions
Can I use RCGT inserts for aluminum with this holder?
Yes! The SRGCR2020K08 is fully compatible with both RCMT (standard) and RCGT (ground/polished for aluminum) 08mm round inserts.
Is this toolholder Right-Hand or Left-Hand?
The "R" in SRGCR stands for Right-Hand. Please check your turret rotation before purchasing.
Why use a round insert for profiling?
Round inserts have the strongest geometry, preventing edge chipping and providing superior surface finish at high feed rates on radii.
Material Pro Tip: High-Feed Radius Machining
When using the SRGCR2020K08, remember that actual chip thickness is less than the feed per revolution. For radius finishing, you can increase your feed rate by up to 25% compared to conventional tools, significantly reducing cycle times while maintaining a perfect finish.
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.