SRGCL2020K12 External Turning Tool Holder for RCMT Inserts – BEYOND
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💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
SRGCL2020K12 External Turning Toolholder
Precision 20x20mm Left-Hand Shank for RCMT1204 Round Inserts
Product Overview
"What is the best 20mm toolholder for vibration-free profiling and radius turning with round inserts?"
The Beyond SRGCL2020K12 is a professional-grade external turning toolholder designed for high-performance profiling using RCMT1204 round inserts. The 20x20mm shank provides a perfect balance of agility and rigidity for medium-sized CNC lathes. By utilizing round insert geometry, the SRGCL series offers a stronger cutting edge than traditional diamond shapes, allowing for multi-directional cutting and exceptional heat dissipation in tough-to-machine alloys.
Key Features
- ✔ High Rigidity Design: Forged from high-tensile alloy steel to suppress vibration during deep profiling.
- ✔ Screw-Down Clamping: Ensures the RCMT12 insert remains perfectly stationary under high radial loads.
- ✔ Profiling Versatility: No fixed lead angle allows for smooth radii and contouring in both directions.
Technical Specifications
Screw Clamp
Round Shape
90° Approach
7° Relief
Left Hand
20x20mm
125mm Len
RCMT12
| Technical Data | Metric (mm) | Imperial (inch) |
|---|---|---|
| Shank Size | 20 x 20 mm | 0.787" x 0.787" |
| Overall Length | 125 mm | 4.921" |
| Compatible Insert | RCMT 1204** | Round 1/2" |
Recommended Cutting Parameters
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (P) | 150 - 230 m/min | 0.15 - 0.45 mm/rev |
| Stainless Steel (M) | 110 - 170 m/min | 0.10 - 0.35 mm/rev |
Required Insert: RCMT 1204** / RCGT 1204**
Specifically designed for 12mm round inserts for maximum profiling agility.
Shop RCMT1204 Inserts →Applications
- Complex Shaft Profiling
- Radii Turning & Contouring
- Heavy Roughing of Castings
- Semi-finishing in Stainless Steel
Compatibility
Fits all standard CNC Turrets with 20mm tool slots. Fully compatible with ISO standard RCMT/RCGT 12mm round inserts from brands like Sandvik, Mitsubishi, and Beyond.
Beyond Material Comparison
Forged Steel Shank: Our toolholders are manufactured from 42CrMo alloy steel, quenched and tempered to HRC 42-45. Compared to standard 45# carbon steel shanks found in budget alternatives, Beyond toolholders offer significantly higher impact resistance and thread durability.
Customer Field Reviews
"Great stability for profiling stainless parts. The 20mm shank fits perfectly in our HAAS turret."
— John M., USA"Halter ist sehr präzise gefertigt. RCMT1204 Platten passen spielfrei. Top Preis-Leistung."
— Dieter W., Germany"Excellent rigidity for radii turning. Much better tool life than using diamond inserts for profiling."
— Marco P., Italy"Precision manufacturing. Fits our Japanese lathe turrets perfectly."
— Kenji S., JapanFrequently Asked Questions
Can I use RCGT inserts for aluminum in this holder?
Yes! The SRGCL2020K12 is designed for both RCMT (standard) and RCGT (ground/polished) 12mm round inserts.
Is this toolholder Left-Hand or Right-Hand?
The "L" in SRGCL indicates a Left-Hand toolholder. Ensure this matches your machine's turret and spindle rotation.
Why use a round insert for profiling?
Round inserts have the strongest cutting edge and allow for multi-directional cutting without chipping, which is ideal for complex contours.
Material Pro Tip: Round vs. Diamond Profiling
While diamond inserts (CNMG/DNMG) are great for straight turning, round inserts on an SRGCL holder are superior for materials with hard skins or scales. By distributing the cutting force over a larger radius, you significantly increase tool life and process stability in interrupted cuts.
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.