Beyond STFCL2020K11 CNC Left Hand External Turning Tool Holder
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✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
Beyond STFCL2020K11 CNC Left Hand External Turning Tool Holder
Product Overview
"Which 20mm square-shank left-hand tool holder is best optimized for smooth external profiling, high-precision facing, and intricate contouring using positive 60° triangular carbide inserts on CNC turning centers?"
The Beyond STFCL2020K11 is an industrial-grade, indexable external left-hand turning tool holder engineered for high-precision lathe operations, finishing runs, and light-to-medium roughing cycles. Forged from high-tensile, heat-treated alloy steel, this tool incorporates a precise 91-degree approach angle (Lead Angle). The insert pocket is machined to a micron-level tolerance specifically to host TCMT1102-- (ANSI TCMT21.5--) positive triangular carbide inserts. Combining a heavy-duty 20x20mm square shank with a compact 11mm insert footprint, it offers an extreme degree of clearance and structural stiffness that suppresses harmonic vibrations across carbon steels, alloy steels, and sticky stainless steels.
ISO Naming Standard & Blueprint Breakdown
Every design metric of this turning bar follows rigorous international standard nomenclature:
Screw-On Lock
Triangle (60°)
91° Lead Angle
7° Positive Angle
Left Hand (L)
20mm x 20mm
125mm (K)
11mm (TCMT1102)
Product Key Features & Performance Advantages
- Quenched Alloy Substrate (HRC 42-45): Crafted from premium 42CrMo structural alloy steel subjected to specialized heat treatment to maximize fatigue life and structural resilience under continuous chip loads.
- Precision Pocket Pocketing & Seat Rigidity: Form-fitted precisely for the compact TCMT1102 size parameters, preventing micro-shifting under heavy load vectors and ensuring uniform wear patterns.
- 91° Left-Hand Clearance Configuration: Facilitates seamless left-hand longitudinal turning paths and clean perpendicular shoulder facing steps without rear-wall dragging.
- Anti-Wear Finish Protection: Coated in an industrial-grade matte black oxide layer to resist atmospheric rust, minimize micro-abrasion, and encourage unobstructed chip evaluation.
Technical Specifications & Metric vs Imperial Matrix
Maximize your machine's output with perfectly matched cutting inserts. Click the link button below to access our selection of premium triangle inserts:
✦ Shop Compatible TCMT1102 (TCMT21.5) Carbide Inserts ✦| Dimension Property Parameter | Metric Specification (ISO System) | Imperial System Equivalent (ANSI) |
|---|---|---|
| Tool Holder Naming Code | STFCL2020K11 | STFCL12-2C (Functional Size Match) |
| Shank Cross-Section Height & Width | 20 mm x 20 mm | 0.787" x 0.787" (Approx. 3/4 Inch Shank) |
| Overall Shank Length (L) | 125 mm | 4.921" |
| Applicable Insert Profiling | TCMT 1102-- (e.g., TCMT110204 / 110208) | TCMT 2(1.5)1 / TCMT 2(1.5)2 |
| Fastener Clamping Screws | Central Torx Screw M2.5 (T8 Wrench) | Heavy-Duty Insert Screw Equivalent |
| Cutting Hand Direction | Left Hand (L) | Left Hand (L) |
Recommended Industrial Cutting Parameters Matrix
| Workpiece Material Matrix | Cutting Velocity (Vc) Range | Feed Per Revolution (fn) Range |
|---|---|---|
| Carbon & Alloy Steels (P-Class) | 180 - 320 m/min (590 - 1050 SFM) | 0.05 - 0.22 mm/rev (0.002 - 0.009 ipr) |
| Stainless Steel Alloys (M-Class) | 120 - 230 m/min (395 - 755 SFM) | 0.04 - 0.18 mm/rev (0.0016 - 0.007 ipr) |
| Grey / Nodular Cast Iron (K-Class) | 140 - 260 m/min (460 - 850 SFM) | 0.06 - 0.25 mm/rev (0.0024 - 0.010 ipr) |
Industrial Product Applications
The STFCL2020K11 tool bar is engineered for nimble metal removal and stable processing across standard production setups:
- Precision External Profiling: The larger 20mm shank combined with a smaller 11mm insert gives programmers unique clearance paths when negotiating intricate contours or step-downs.
- 90-Degree Facing & Under-Cutting: The 91° approach angle allows clean 90-degree square shoulder steps to be faced seamlessly in a left-hand feeding path.
- High-Accuracy Finishing Cycles: Engineered primarily for light finishing steps and profiling passes where chip thickness control and low tool pressures are critical.
Machinery & Equipment Compatibility
Universally compatible with standard CNC automatic turrets, mid-sized production tool blocks, and conventional lathe quick-change tool posts (QCTP) utilizing standard 20mm (3/4 inch) tooling slots.
Beyond Brand Tooling Grade Comparison Matrix
| Beyond Holder Grade Line | Base Material Chemistry & Metallurgy | Primary Optimization Target | Anti-Chatter Rating |
|---|---|---|---|
| BY-Eco Class (HRC 40) | Standard 40Cr Structural Carbon Steel | Light maintenance, manual prototyping | ★★★☆☆ |
| BY-Pro Class (HRC 45) [This Model] | Premium Forged 42CrMo Steel Alloy | High production loops, high-feed processing | ★★★★★ |
| BY-Extreme Master (HRC 48) | Hardened Tool Steel + Special Treatment | Severe interrupted cuts, high-nickel alloys | ★★★★☆ |
Why Choose Beyond CNC Tooling?
Beyond delivers field-proven accuracy for modern production spaces. Through specialized CNC pocket pocketing, our indexable bars provide absolute seat positioning stability, reducing dimensional drift and extending carbide insert life under varied cutting parameters.
Worldwide Customer Experiences (Verified Toolrooms)
Using a 20mm shank with an 11mm insert gives incredible structural rigidity while still allowing room for tight corner profiles. Zero flex observed at high speeds.
Our machine shop pairs this left-hand holder with sharp ground inserts for high-precision facing loops. The surface finish quality remains exceptionally stable.
The pocket milling precision is top tier. The screw seats perfectly straight, holding down small TCMT1102 tips without any shifting issues.
Even under continuous production running conditions, the black oxide film layer handles hot chips effectively. Beyond tools are a permanent staple in our turret blocks.
AI-Style FAQ Assistant
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.