SRACL2020K16 External Turning Tool Holder for RCMT Inserts – BEYOND
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SRACL2020K16 External Turning Toolholder
Precision 20x20mm Left-Hand Shank for RCMT1606 Round Inserts
Product Overview
"Which 20mm left-hand toolholder provides the best stability for aggressive profiling and radius contouring with 16mm round inserts?"
The Beyond SRACL2020K16 is a heavy-duty external turning toolholder engineered specifically for RCMT1606 round inserts. Designed for CNC applications requiring high metal removal rates (MRR) and complex geometry profiling, the 20x20mm shank offers an excellent balance of accessibility and rigidity. Round inserts are the strongest edge geometry available, effectively dissipating heat and mechanical stress over a larger radius. This tool is the ideal solution for roughing and finishing large radius profiles in steel, stainless steel, and cast iron.
Key Features
- ✔ High-Tensile 42CrMo Steel: Quenched and tempered to HRC 42-45 for superior impact resistance and tool life.
- ✔ Advanced Screw Clamping: Precision pocket design ensures stable insert seating and maximum repeatability.
- ✔ Superior Surface Finish: Specifically designed to handle the high cutting forces of 16mm radius inserts without harmonic chatter.
Technical Specifications
Screw Clamp
Round Shape
90° Approach
7° Relief
Left Hand
20x20mm
125mm Len
RCMT16
| ISO Parameter | Metric (mm) | Imperial (inch) |
|---|---|---|
| Shank Size (H x W) | 20 x 20 mm | 0.787" x 0.787" |
| Total Length | 125 mm | 4.92" |
| Insert Size | RCMT 1606** | Round 5/8" |
Recommended Cutting Parameters
| Material Group | Speed (Vc) | Feed Rate (f) |
|---|---|---|
| P (Steel) | 140 - 240 m/min | 0.15 - 0.45 mm/rev |
| M (Stainless Steel) | 110 - 180 m/min | 0.12 - 0.35 mm/rev |
Required Insert: RCMT 1606** / RCGT 1606**
Optimized for large 16mm round inserts to handle high-depth cuts and radius transitions.
View Compatible Inserts →Primary Applications
- Large Shaft Roughing & Contouring
- Heavy Radius Profiling
- External Facing in Alloy Steel
- Machining of Forged Parts
Compatibility
Fits all standard CNC turrets and tool posts with 20mm tool blocks. Standard ISO geometry ensures compatibility with RCMT 16 series inserts from Beyond, Sandvik, and other major manufacturers.
Beyond Brand Material Comparison
Rigidity & Reliability: While many generic toolholders use standard carbon steel, Beyond utilizes high-alloy 42CrMo steel. Our specialized quenching process provides 30% higher harmonic damping capacity. This is critical for the 16mm round insert, as it prevents micro-vibrations from chipping the carbide edge, resulting in superior surface finishes and 20% longer tool life.
Verified Customer Reviews
"Excellent rigidity for profiling on my CNC. The 16mm round insert stays rock solid. Great for heavy roughing."
— Robert D., USA"Qualität ist top. Sehr stabil bei großen Schnitttiefen. Schnelle Lieferung nach Deutschland."
— Dieter W., Germany"The Beyond toolholders are consistently reliable. Accuracy is equal to much more expensive brands."
— Marco V., Italy"High quality finish on cast iron. The pocket fit for the RCMT16 is perfect."
— Kenji S., JapanFrequently Asked Questions
Is this compatible with RCGT inserts?
Yes! The SRACL2020K16 is fully compatible with both RCMT (standard) and RCGT (ground/polished for aluminum) 16mm round inserts.
What is the benefit of a Left-Hand (L) holder?
Left-hand holders are used for machining from the spindle toward the tailstock or on specific CNC turret configurations that require left-hand approach angles.
Does it include the screw and wrench?
Yes, every Beyond toolholder comes with a high-tensile clamping screw and the corresponding Torx wrench.
Material Pro Tip: Radius Advantage
When roughing with the SRACL2020K16, the 16mm round insert allows for significantly higher feed rates compared to standard diamond-shaped inserts. Because the edge is stronger, you can push the tool harder without fear of breaking the tip, maximizing your machine's productivity.
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.