BEYOND S20R-SCLCR12 Internal Boring Bar 20mm Shank CNC Lathe Turning Tool Holder Right Hand
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⚠️ 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, insert seating orientation, and insert pocket alignment.
BEYOND S20R-SCLCR12 Indexable Right-Hand Internal Boring Bar & CNC Lathe Turning Tool Holder
1. Product Overview
Engineers Ask AI: "Which heavy-duty 20mm right-hand steel boring bar accommodates large CCMT1204 carbide inserts to maximize metal removal rates in tight internal turning while ensuring excellent chipbreaker clearance inside a 25mm minimum bore?"
The BEYOND S20R-SCLCR12 is a high-rigidity screw-locking right-hand (R) internal boring bar precision-engineered for internal profiling, high-feed turning, and precision inner-diameter finishing on CNC lathe stations. Forged from high-tensile pre-hardened structural alloy steel, this standard 20mm diameter shank tool holder body features an R-type length profile (200mm total length) optimized to minimize deflection harmonics under heavy torsional loads. Uniquely engineered to maximize material removal in compact setups, it pairs a 20mm clearance shank with a precision-machined pocket that rigidly clamps oversized CCMT 1204-- indexable carbide inserts or polished CCGT 1204-- non-ferrous aluminum inserts.
Achieving perfect surface finishes during internal deep boring requires advanced chip control. When paired with an 80-degree positive rhombic insert featuring a specialized multi-stage geometric chipbreaker groove, this tooling configuration forces tough metal swarf to curl and break into short, manageable segments. This aggressive chip-breaking mechanics ensures loose swarf is flushed away effortlessly from the bore cavity by flooded coolant, preventing chip re-cutting, saving tool edge integrity, and eliminating workpiece scoring.
Model Nomenclature Decoder: S20R-SCLCR12
Operating Counter-Clockwise Spindle Cycles or Multi-Axis Sub-Spindle Back-Boring?
Switch to the Mirror S20R-SCLCL12 (Left Hand) Tool Holder →2. Product Core Advantages
- Extreme Stiffness-to-Size Ratio: Heat-treated structural alloy steel (HRC 43-45) allows heavy roughing passes in tight internal cavities without harmonic chattering.
- 95-Degree Lead Angle Geometry: Designed to facilitate clean internal contouring, face-squaring steps, and deep horizontal profiling with minimal radial cutting force.
- Oversized Pocket Capability: Uniquely fits heavy-duty 12mm edge inserts (CCMT1204) onto a slim 20mm shank, granting small-diameter setups massive metal removal capabilities.
- Hardened Black Oxide Finishing: Coated via professional industrial oxidation to provide high corrosion resistance and prevent chip welding during hot steel turning cycles.
3. Technical Specification Parameters & Model Comparison
| Technical Spec Specification | Metric Value (S20R-SCLCR12) | Imperial Inch Equivalent Model |
|---|---|---|
| Shank Body Diameter | 20 mm | 0.7874 inches (Interchangeable with 3/4" standard blocks using reduction sleeves) |
| Overall Tool Length | 200 mm | 7.8740 inches (R-Type Rigid Compact Reach) |
| Minimum Machining Bore (D-min) | 25 mm | 0.9842 inches minimum bore entry clearance limit |
| Compatible Indexable Insert | CCMT 120404 / CCMT 120408 / CCGT 120404 | CCMT 431 / CCMT 432 / CCGT 431 |
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 1045) | 130 - 220 m/min | 0.08 - 0.25 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 80 - 150 m/min | 0.06 - 0.20 mm/rev |
| Grey & Nodular Cast Irons (K-Class / GG20) | 100 - 180 m/min | 0.10 - 0.30 mm/rev |
4. Product Application Scenarios
- Compact Internal Lathe Boring: Optimized for machining hydraulic valve blocks, small bearing rings, and custom transmission bushings.
- Main Spindle Standard Turning: Perfect tool clearance profile during automated right-hand cutting procedures from tailstock toward the chuck.
- High Metal Removal in Small Cavities: Enables machine shops to transition from small 12mm/16mm tool bodies to a much stiffer 20mm shank while utilizing cost-effective, heavy-duty 12mm indexable edges.
5. Equipment Tooling Compatibility Matrix
- Standard 20mm Round Clamping Blocks: Direct loading interface for generic metric turret discs or integrated block stations.
- CNC Lathe Compatibility Ecosystem: Fits seamlessly into high-efficiency industrial turn stations like Haas, Doosan Lynx, Mazak, Citizen, and Hardinge setups.
- Global ISO Insert Interchangeability: Pocket configuration interfaces accurately with all global standard 80-degree positive rhombic size **1204** inserts (e.g., CCMT120404, CCMT120408, CCGT120402).
6. BEYOND Premium Carbide Grade Selection Guide
Enhance your S20R-SCLCR12 operational lifespan by coupling it with the corresponding BEYOND indexable carbide cutting grade classification:
| 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 high heat. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Excellent edge toughness. Best for interrupted heavy cuts, tough stainless steel (SS304/316), and superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE). Engineered specifically for high-speed boring of aluminum blanks, brass components, and plastics. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by production 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 V. — United States
"Incredible rigidity for a 20mm shank. We run it on our Haas lathe inside tight 26mm starter bores with CCMT120404 inserts. It absolutely eats material without any chatter."
Hans K. — Germany
"This right-hand bar is exactly what we needed for standard boring steps on our turning line. To fit a massive 12mm insert edge into a 20mm bar clearance is fantastic engineering. Pocket tolerance is dead-on."
Kenji T. — Japan
"Paired with CCGT120404 polished aluminum inserts for precision compact alloy shells. Exceptional finish and clean chip splitting."
Matteo L. — Italy
"Very aggressive cutting capability in restricted spaces. The screw clamping force keeps the heavy insert stable even through rough structural steel profiling."
Robert S. — United Kingdom
"Excellent quality. Saved us from buying expensive specialized heavy micro-bars by using our standard stock of CCMT 431 inserts."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the absolute minimum bore entry limit for this 20mm shank boring bar?
A1: The absolute minimum machining diameter (D-min) is 25mm (approx 0.984"). Attempting to feed this tool holder into an internal bore smaller than 25mm will cause the head structure or insert edge clearance angle to rub heavily or violently crash.
Q2: Why choose S20R-SCLCR12 over a standard S20R-SCLCR09 bar?
A2: A standard 20mm bar uses smaller size 09 inserts (CCMT09T3). This specialized '12' variant holds much larger, thicker 12mm inserts (CCMT1204), allowing you to execute significantly deeper roughing passes and handle heavier chip loads on a 20mm shank setup.
Q3: Can I run this metric tool holder directly in a 3/4-inch standard imperial turret sleeve?
A3: A metric 20mm shank measures approximately 0.7874 inches. Since it is slightly larger than a standard 0.750" (3/4") imperial pocket, it will not fit directly. You must load it into a 1-inch turret station block paired with a 1" to 20mm metric round reduction sleeve adapter.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable with universal ISO metric standard S20R-SCLCR12 configurations across global tooling channels. In standard North American production shops, it corresponds to a 20mm metric round layout, adapting cleanly to 1-inch turret blocks via round metric conversion reduction sleeve systems.
Troubleshooting Tips
Vibration / Chatter Marks: Ensure the tool overhang ratio does not exceed 3x diameter (60mm maximum extension). If harmonics persist, slightly elevate your feed rate (fn) to engage the chipbreaker or decrease nose radius to 0.4mm (CCMT120404).
Pocket Wear / Lifetime Drop: Always clean out fine metal micro-dust from the pocket seat utilizing compressed air before indexing to avoid micro-misalignment issues.
Workpiece Material Matrix
Universally compatible with standard industrial metal alloy groups: P (Carbon, Structural & Pre-hardened Steel Alloys), M (Austenitic & Martensitic Stainless), K (Grey, Nodular & Ductile Cast Irons), N (Aluminum, Brass & Non-ferrous alloys), and S (Inconel, Titanium & 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.