SRDCN2020K12 External Turning Tool Holder for RCMT Inserts – BEYOND
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SRDCN2020K12 External Turning Toolholder
Precision 20x20mm Neutral Shank for RCMT1204 Round Inserts
Product Overview
"Which neutral toolholder provides the best edge strength for complex profiling and radius turning on a 20mm CNC turret?"
The Beyond SRDCN2020K12 is a professional-grade external turning toolholder specifically designed for RCMT1204 round inserts. Unlike traditional diamond-shaped inserts, the round geometry utilized by the SRDCN2020K12 offers the strongest possible cutting edge, effectively distributing heat and pressure to prevent edge chipping. This neutral holder is the ultimate choice for roughing forged parts and finishing multi-directional contours in steel and alloy materials where vibration stability is paramount.
Key Features
- ✔ High-Tensile 42CrMo Steel: Quenched and tempered to HRC 42-45 for superior impact resistance and vibration damping.
- ✔ Screw-Down Clamping: Engineered for maximum insert support and unobstructed chip evacuation during deep contouring.
- ✔ Industrial Black Oxide Finish: Prevents corrosion and reduces toolholder wear in high-temperature environments.
Technical Specifications
Screw Clamp
Round Shape
Neutral/45°
7° Relief
Neutral 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" |
| Insert Size | RCMT 1204** | Round 1/2" |
Recommended Cutting Parameters
| Material Group | Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (P) | 160 - 280 m/min | 0.15 - 0.45 mm/rev |
| Stainless Steel (M) | 110 - 190 m/min | 0.12 - 0.35 mm/rev |
Required Insert: RCMT 1204** / RCGT 1204**
High-performance round carbide inserts are mandatory for optimal profiling performance.
View Compatible Inserts →Common Applications
- Roughing Forged Steel Components
- Complex Radius & Profile Turning
- Hydraulic Component Machining
- Symmetrical Profiling from Both Sides
Machine Compatibility
Fits all standard CNC turrets with 20mm tool slots. Standard ISO geometry ensures full compatibility with RCMT 12 series inserts from Beyond and other international 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 profiling.
Customer Field Reviews
"Great stability on my CNC lathe. Profiling shafts used to be a headache, but this neutral holder with RCMT inserts fixed it."
— Robert D., USA"Präzise gefertigt. Die Schraubklemmung hält den Druck beim Schruppen sehr gut aus. Sehr zufrieden."
— Hans K., Germany"Ottima qualità del materiale. La finitura superficiale è eccellente anche ad avanzamenti elevati."
— Marco V., Italy"Beyond toolholders are consistently reliable. The seat accuracy for RCMT12 is perfect."
— Kenji S., JapanFrequently Asked Questions
What is the advantage of a Neutral (N) toolholder?
Neutral holders allow the tool to approach the workpiece from the center, making them ideal for symmetrical profiling and contouring without needing separate right/left hand tools.
Can I use RCGT inserts with this holder?
Yes! The SRDCN2020K12 is fully compatible with both RCMT (standard) and RCGT (ground/polished for aluminum) 12mm round inserts.
Is the clamping screw and wrench included?
Yes, all Beyond toolholders are shipped with a high-strength clamping screw and the corresponding Torx wrench.
Material Pro Tip: High-Efficiency Contouring
When using the SRDCN2020K12, the round insert geometry allows for higher feed rates because the "chip thinning" effect is maximized on radii. For roughing, you can increase your feed per revolution by up to 15% compared to standard diamond tools.
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.