SRACL2020K12 External Turning Tool Holder for RCMT Inserts – BEYOND
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SRACL2020K12 External Turning Toolholder
Professional 20x20mm Left-Hand Shank for RCMT1204 Round Inserts
Product Overview
"Which left-hand 20mm toolholder is best for achieving high-stability profiling and smooth radius contouring with 12mm round inserts?"
The Beyond SRACL2020K12 is a precision-engineered external turning toolholder designed specifically for RCMT1204 (and RCGT) round inserts. In specialized CNC machining, round inserts are the gold standard for edge strength, as they lack the weak points of traditional diamond or triangular tips. This 20x20mm shank model is optimized for left-hand operations where high vibration damping and superior thermal distribution are required for profiling complex contours in steel, stainless, and high-temp alloys.
Key Features
- ✔ Quenched 42CrMo Steel: Forged from high-alloy steel and heat-treated to HRC 42-45 for maximum durability.
- ✔ Screw-Down Clamping Stability: The S-type clamping mechanism provides a low-profile head and massive holding power for profiling.
- ✔ Enhanced Surface Finish: Black oxide coating resists corrosion and prevents chip welding during high-temp operations.
Technical Specifications
Screw Clamp
Round Shape
90° Approach
7° Relief
Left 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 | 4.92" |
| Insert Size | RCMT 1204** | Round 1/2" |
Recommended Cutting Parameters
| Material Group | Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Steel (P) | 150 - 250 m/min | 0.15 - 0.45 mm/rev |
| Cast Iron (K) | 130 - 210 m/min | 0.12 - 0.40 mm/rev |
Required Insert: RCMT 1204** / RCGT 1204**
Specifically designed for 12mm round inserts for maximum profiling efficiency.
Shop RCMT12 Inserts →Primary Applications
- High-Rigidity Profiling & Contouring
- Large Radius Fillet Machining
- Internal Back-Turning (Setup Dependent)
- Medium-Roughing to Finishing in Tough Materials
Compatibility
Compatible with CNC turrets and conventional tool posts designed for 20mm (3/4") square shanks. Fits standard RCMT 12 series inserts from Beyond, Mitsubishi, and Sandvik.
Beyond Brand Material Comparison
The Rigidity Factor: While entry-level 20mm holders often use standard carbon steel, Beyond utilizes high-alloy 42CrMo steel. Our specialized quenching process results in 30% higher damping capacity, which is vital when taking deep cuts with a 12mm radius insert. This prevents micro-chatter, resulting in superior surface finishes and extended carbide tool life.
Verified B2B Success
"Excellent rigidity for a 20mm shank. I use this for roughing large fillets and it stays rock solid. The 12mm round insert lasts forever on this shank."
— Robert D., USA"Qualität ist erstklassig. Die RCMT12 Platten sitzen fest und sicher. Beste Wahl für schwere Zerspanung auf kleineren Maschinen."
— Dieter W., Germany"Excellent toolholder for profiling. The finish on cast iron is impressive when using the 12mm radius."
— Marco V., Italy"Beyond toolholders are consistently reliable. Accuracy is equal to top-tier brands but at a better price for our shop."
— Kenji S., JapanFrequently Asked Questions
Is this compatible with RCGT inserts?
Yes. The SRACL2020K12 is fully compatible with both RCMT and RCGT 1204** inserts, allowing you to switch between steel and aluminum/non-ferrous profiling easily.
What is the benefit of a Left-Hand (L) holder?
Left-hand holders are used for machining from the tailstock toward the spindle or on specific CNC turret configurations that require left-hand approach angles.
Are the screw and wrench included?
Yes, every Beyond toolholder comes with a high-tensile clamping screw and the corresponding Torx wrench.
Material Pro Tip: High-Feed Radius Advantage
When roughing with the SRACL2020K12, the 12mm round insert allows for significantly higher feed rates compared to standard diamond inserts. Because the edge is stronger, you can increase your depth of cut to maximize metal removal rates without risking tool breakage.
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.