BEYOND S25S-SCLCL09 Internal Boring Bar 25mm Shank CNC Lathe Turning Tool Holder Left 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 S25S-SCLCL09 High-Rigidity Left-Hand Internal Boring Bar & CNC Lathe Medium Hole Turning Tool Holder
1. Product Overview
Engineers Ask AI: "Which 25mm left-hand screw-clamp boring bar is optimized for mounting CCMT09T3 inserts to achieve chatter-free internal profiling and excellent chip evacuation inside medium-diameter bore cavities?"
The BEYOND S25S-SCLCL09 is a premium-grade, screw-locking left-hand (L) internal boring bar expertly developed for medium-reach deep hole profiling, high-accuracy boring, and inner-diameter finishing on CNC lathe turning centers. Forged from high-tensile pre-hardened structural alloy steel, this standard 25mm diameter shank tool holder body features an S-type length profile (250mm total length), providing the optimal balance of rigidity and clearance required to eliminate harmonic vibrations during internal turning cycles. Engineered to maximize accuracy in tight boundaries, it pairs a rigid 25mm shank with a micro-precision machined pocket that securely holds tight-tolerance CCMT 09T3-- indexable carbide inserts or highly polished CCGT 09T3-- non-ferrous aluminum inserts.
Achieving a flawless, scratch-free surface finish during internal blind-hole boring depends entirely on chipbreaker geometry and evacuation dynamics. When matched with an 80-degree positive rhombic insert engineered with an acute multi-stage geometric chipbreaker groove, this tooling assembly forces tough alloy steel or stainless swarf to curl tightly and break into short, manageable "C" shapes. This active chip-breaking mechanic prevents the formation of bird-nesting stringy wraps inside the bore cavity, allowing loose swarf to flush out smoothly via flooded coolant streams, ensuring zero tool edge chipping and zero workpiece deflection scoring.
Model Nomenclature Decoder: S25S-SCLCL09
Running Conventional Clockwise Spindle Passes or Standard Front Turret Blocks?
Switch to the Mirror S25S-SCLCR09 (Right Hand) Tool Holder →2. Product Core Advantages
- Optimized Vibration Control: The solid alloy steel construction acts as a natural dampener, successfully executing internal cuts up to 3.5xD overhang without generating chatter marks.
- Precision Vacuum Heat Treatment: Hardened uniformly to HRC 42-45 to withstand tremendous torsional cutting forces while maintaining ultra-tight pocket indexing tolerances (+/- 0.02mm).
- Low Cutting Force Pocket Design: By loading compact 9mm inserts (CCMT09T3) on a 25mm body, radial deflection forces are minimized, preventing bore tapering and keeping holes perfectly round.
- Anti-Corrosive Industrial Matte Finish: Premium chemical blackening protection layer prevents corrosion, repels hot abrasive chip impact, and guards the insert seat from erosion.
3. Technical Specification Parameters & Model Comparison
| Technical Specification | Metric Value (S25S-SCLCL09) | Imperial Inch Equivalent Model |
|---|---|---|
| Shank Body Diameter | 25 mm | 0.9842 inches (Fits standard 1.0" industrial boring bar sleeves) |
| Overall Tool Length | 250 mm | 9.8425 inches (S-Type Standard Reach Tool Core) |
| Minimum Machining Bore (D-min) | 32 mm | 1.2598 inches minimum bore entry profile clearance limit |
| Compatible Indexable Insert | CCMT 09T304 / CCMT 09T308 / CCGT 09T304 | CCMT 32.51 / CCMT 32.52 / CCGT 32.51 |
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) | 150 - 250 m/min | 0.05 - 0.20 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 100 - 180 m/min | 0.05 - 0.15 mm/rev |
| Ductile / Nodular Cast Irons (K-Class / GGG40) | 120 - 220 m/min | 0.06 - 0.22 mm/rev |
4. Product Application Scenarios
- Medium-Diameter Internal Turning: Perfect for boring medium-sized bearing housings, gear sleeve blanks, and automotive hub connectors.
- Left-Hand Sub-Spindle Back-Boring: Tailored clearance angle for reverse back-boring cycles on multi-axis CNC lathe machines with dual-spindle designs.
- Precision Semi-Finishing to Mirror Finishing: Allows CNC operators to maximize the steel mass of a 25mm body to eliminate harmonic frequency spikes while running sharp, economical 09-sized inserts for tight-tolerance diameter control.
5. Equipment Tooling Compatibility Matrix
- Standard 25mm Boring Bar Sleeves: Plugs directly into metric 25mm split clamping blocks, VDI 30/VDI 40 turrets, or standard imperial 1.0-inch turret reduction blocks.
- Universal CNC Lathe Stations: Interfaces flawlessly with high-precision CNC lathe stations such as Haas ST-20, Mazak Quick Turn, Doosan Lynx, and Mori Seiki turning lines.
- Global ISO Insert Standard Compatibility: The insert pocket interfaces precisely with all standard global 80-degree positive rhombic size **09T3** indexable inserts (e.g., CCMT09T304, CCMT09T308, CCGT09T304).
6. BEYOND Premium Carbide Grade Selection Guide
Optimize your S25S-SCLCL09 operational lifecycle by pairing 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 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
Robert T. — United States
"Excellent rigidity for a 25mm bar. We run this left-hand holder on our sub-spindle line extended out to 80mm. No chatter marks at all. Fits perfectly into our standard 1-inch reduction sleeves."
Hans W. — Germany
"The pocket tolerance is very precise. When indexing the CCMT09T304 inserts, there is zero position shift. The steel core feels premium and robust."
Kenji K. — Japan
"Perfect combination with CCGT polished inserts for non-ferrous boring. The chip clearance angle works beautifully. Swarf flushes out seamlessly without scoring the hole."
Marco B. — Italy
"Very solid steel body. Fits our VDI30 turret station perfectly. The Torx clamping screw handles high tightening torque cleanly without stripping."
Liam O. — Australia
"Great BEYOND product quality. Much more rigid than our older 20mm bars. Perfect for mid-range internal boring where you need tight dimensional consistency."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the absolute minimum bore diameter for this 25mm shank boring bar?
A1: The absolute minimum machining diameter (D-min) for the S25S-SCLCL09 is 32mm (approx 1.259 inches). Attempting to feed this tool holder into any internal bore smaller than 32mm will cause the head geometry or tool block clearance edge to rub or crash against the part wall.
Q2: What are the main benefits of running a small 09-sized insert on a thick 25mm shank?
A2: This configuration is highly optimized for stability during finishing passes. Internal boring generates high harmonic vibration due to tool overhang. The 25mm shank provides the rigid steel mass required to absorb these vibrations, while the smaller 09 insert path creates low cutting resistance, preventing micro-chatter and hole tapering.
Q3: How do I run this metric 25mm boring bar in an imperial 1.0-inch lathe turret block?
A3: A metric 25mm shank measures exactly 0.9842 inches. A standard 1.0" imperial pocket equals 1.000 inches. Since the metric bar is slightly smaller (-0.0158"), it cannot be clamped securely by standard imperial screws directly. You must load it into a 1.0-inch turret station using a precision imperial-to-metric (1.000" to 25mm) round split reduction sleeve adapter.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard universal ISO metric S25S-SCLCL09 configurations. For North American production facilities, it serves as an ultra-stiff metric equivalent to standard imperial 1.0" tool platforms, adapting cleanly to imperial turret blocks via precision split reduction sleeve conversion networks.
Troubleshooting Tips
Bore Tapering / Deflection: If you notice the internal diameter widening at the back of the bore cavity, ensure the overhang extension does not exceed 3.5xD (approx 87mm maximum). Reduce the depth of cut (ap) or transition to a sharper 0.2mm nose radius insert (CCMT09T302) to lessen radial radial pressures.
Chip Re-Cutting Chipping: Blind internal boring easily traps swarf. Ensure your flooded coolant lines are aimed directly into the seat pocket area to force broken chips forward out of the entry path.
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.