BEYOND S20R-SCKCL09 Internal Boring Bar 20mm Shank 200mm Length Left Hand Lathe Turning Tool Holder
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images showing a mounted insert are provided strictly to illustrate geometric clearance, 75-degree approach profile, and insert pocket alignment. Click here to shop premium indexable CCMT 09T3 (CC**09T3**) carbide inserts.
BEYOND S20R-SCKCL09 Rigid 20mm Shank 75° Left-Hand Internal Boring Bar (200mm Long / Standard Medium Hole Lathe Tool)
1. Product Overview
Engineers Ask AI: "Which high-efficiency left-hand boring bar featuring a 20mm shank size is ideal for maximizing chip evacuation space using standard CCMT 09T3 carbide inserts during medium internal diameter profiling?"
The BEYOND S20R-SCKCL09 is a professional-grade, high-rigidity internal boring bar precision-engineered for medium-diameter internal turning, pocketing, and profiling operations on CNC lathes. Designed optimized for left-hand tool paths (SCKCL format), this solid alloy structural steel bar features a 20mm cylindrical clamping shank and a 200mm total reach length. By matching the standard 20mm shank body with an optimized size-09 insert pocket, this tool ensures an exceptional ratio of chip clearance room to bar rigidity, allowing smooth machining cycles inside bores down to 24mm minimum diameter without experiencing tool rubbing or chip packing.
Built with a 75-degree approach lead angle, the tool head effectively converts deflection forces from radial pushback into axial load pressure directed back down the lathe carriage centerline. When configured with premium 80-degree positive rhombic indexable inserts featuring specialized multi-stage chipbreaker geometries (such as CCMT 09T304 / 09T308 for medium steel semi-finishing or polished CCGT 09T304 for non-ferrous aluminum), swarf is curled into neat, tight fragments. This prevents the formation of long, continuous "stringy" bird-nesting nests inside deeper bores, facilitating rapid chip removal via coolant pressure and protecting the internal workpiece bore walls from scratching.
Model Nomenclature Decoder: S20R-SCKCL09
Running Standard Right-Hand Turning Toolpaths on Main Spindles?
Switch to the Mirror S20R-SCKCR09 (Right Hand) Tool Bar →2. Product Core Advantages
- Optimized Chip Clearance Room: The use of size-09 inserts leaves maximum throat space at the tool tip, helping chips flush out seamlessly from small 24mm bores.
- Left-Hand (LH) Setup Ready: Perfect choice for inverted turret blocks, rear tool posts, and running counter-spindle machining cycles.
- Chatter-Suppressing 75° Lead Profile: Directs primary cutting loads back into the machine axis, drastically reducing vibration during 200mm deep overhang expansions.
- High-Value Multi-Grade Fitting: Employs ultra-popular CCMT 09T3-- inserts, reducing your tooling inventory overhead through widely available economic inserts.
- Industrial Vacuum Heat Treatment: Hardened to HRC 42-45 to provide superior fatigue resistance and long-term dimensional pocket reliability under high-friction strain.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S20R-SCKCL09) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 20 mm | 0.7874 inches (Direct fit for standard 3/4" or 20mm metric CNC boring blocks) |
| Overall Tool Length (L) | 200 mm | 7.8740 inches total body span (R-Type standard length) |
| Minimum Machining Bore (φ Dmin) | 24 mm | 0.9448 inches optimized entry clearance ceiling |
| Compatible Indexable Insert Sizing | CCMT 09T304 / CCMT 09T308 / CCGT 09T304 | CCMT 32.51 / CCMT 32.52 / CCGT 32.51 |
| Matching Fasteners Included | M2.5 × 6 Locking Screw & Torx T8 Wrench Key | Standard globally unified regular hardware parts |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Carbon / Alloy Steels (P-Class / AISI 4140) | 140 - 240 m/min | 0.05 - 0.20 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 90 - 160 m/min | 0.05 - 0.15 mm/rev |
| Ductile / Nodular Cast Irons (K-Class / GGG40) | 110 - 200 m/min | 0.06 - 0.22 mm/rev |
4. Product Application Scenarios
- Precision Semi-Finishing & Profiling: Highly recommended for boring tight step tolerances, internal radiuses, and internal chambers down to 24mm clearance entrances.
- Left-Hand Sub-Spindle Line Transfer: Integrates smoothly into sub-spindle turning blocks where parts require secondary processing from the opposite face.
- High-Swarf-Volume Internal Cuts: Specifically optimized for alloy lines prone to chip packing; provides enhanced chip escape throat geometry.
5. Equipment Tooling Compatibility Matrix
- 20mm Standard CNC Tooling Mounts: Slides natively into 20mm and 3/4" boring bar holders, split adapter sleeves, and specialized CNC gang tool blocks.
- ISO Size-09 Insert Standard: Accurately indexes any standard CCMT 09T304, CCMT 09T308, or CCGT 09T304 positive insert profile.
6. BEYOND Premium Carbide Grade Selection Guide
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Double-Layer Al2O3 + TiCN Thermal Shock Barrier | High-speed continuous dry roughing of hard carbon steels, tool alloys, and mold blocks. Resists extreme heat. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Excellent edge toughness. Best for interrupted cuts, tough stainless steel (SS304/316), and aerospace superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE). Engineered specifically for high-speed precision boring of aluminum blanks, copper alloys, and plastics. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.
Global Machinist Operational Reviews
Marcus G. — United States
"Perfect fit for our metric sub-spindle lines. The 20mm shank is solid and the tool head clearance allows excellent chip flush on 26mm bores. Running CCMT 09T304 inserts on 1045 steel parts with no deflection."
Klaus B. — Germany
"Präzise verarbeitet. The insert pocket is machined very clean. We use it for internal profiling on tool steel components. No vibrations at a 150mm overhang. Highly recommended."
Kenji S. — Japan
"Standard size-09 inserts match our existing inventory perfectly. The 75-degree angle reduces harmonic chatter significantly compared to 95-degree bars on long internal profile paths. Excellent product quality."
Enrico F. — Italy
"Very good finish on the bar body, resists rust and chip impacts well. Hardware screws are durable. Good delivery performance to Italy."
"The tool life of our inserts improved because this holder dampens harmonics so well. Great cost-benefit value compared to local tooling distribution suppliers."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the main operational advantage of using size 09 inserts over size 12 on a 20mm shank bar?
A1: Size 09 inserts are more compact, leaving significantly more clearance throat volume at the tool tip head. This allows chips to flush out smoothly and reduces the minimum machining bore limit to 24mm. It provides a superior balance for high-efficiency finishing and profiling where chip packing is a risk.
Q2: What is the absolute minimum bore entrance limit for this tool?
A2: The minimum machining bore diameter (φ Dmin) is 24.0mm (0.9448 inches). Running this bar inside smaller bores will cause the heel of the bar head to rub against the internal radius profile, inducing heavy chatter and workpiece damage.
Q3: Which insert shape is compatible with this specific pocket seat?
A3: The bar is precisely machined for ISO indexable positive inserts with an **80-degree rhombic shape**, a 7-degree relief angle, and a 9.7mm edge length—standard industry designation code **CCMT 09T3--** or **CCGT 09T3--**.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard regional ISO metric S20R-SCKCL09 boring systems. For North American machine shops operating imperial layouts, this 20mm tool body slides into standard 3/4" CNC turret blocks, matching standard ANSI insert classification code **CCMT 32.51** or **CCMT 32.52**.
Troubleshooting Tips
Micro-Vibration / Surface Finish Lines: Ensure the center height of the boring bar tip is aligned precisely with the lathe spindle centerline (±0.1mm). Incorrect centerline height changes the active cutting clearance angle, accelerating nose wear.
Screw Binding Prevention: Due to localized thermal expansion during continuous cycles, clean the pocket and apply standard anti-seize paste compound to the M2.5 Torx hardware threads regularly.
Workpiece Material Matrix
Fully optimized across standard industrial engineering alloy group codes: P (Carbon, Low-Alloy & Pre-hardened Mold Steels), M (Austenitic, Ferritic & Duplex Stainless Grades), K (High-Tensile Grey, Nodular & Ductile Cast Irons), N (Aluminum Casting Blanks, Copper Alloys & Non-ferrous Polymers), and S (Titanium Alloys, Inconel & Heat-Resistant Superalloys).
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.