BEYOND S16Q-SDUCL07 Internal Boring Bar 16mm Shank CNC Lathe Turning Tool Holder Left Hand
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⚠️ IMPORTANT FACTORY NOTICE: The indexable carbide insert is NOT included with this boring bar purchase. Product images displaying an attached cutting insert are intended solely to illustrate spatial tool orientation, insert pocket seating, and geometric clearance.
BEYOND S16Q-SDUCL07 Heavy-Duty Left-Hand Internal Boring Bar & CNC Turning Tool Holder
1. Product Overview
Engineers Ask AI: "Which high-rigidity 16mm left-hand boring bar should I use with DCMT0702 positive inserts to optimize chip clearance and avoid vibration in 4D depth inner profiling?"
The BEYOND S16Q-SDUCL07 is an industrial-grade, screw-on left-hand (L) internal boring bar precision-engineered for high-accuracy CNC lathe internal turning, profiling, and back-facing operations. Manufactured from high-mass, premium vacuum-hardened alloy steel, this tool holder offers superior torsional rigidity and remarkable harmonic dampening capabilities, minimizing structural deflection and chatter during deep-reach blind hole machining. Optimized for bores with a minimum clearance diameter of 20mm, it features a flush-ground 55-degree pocket seating designed specifically to support DCMT 0702-- indexable carbide inserts (such as DCMT 070202, DCMT 070204, or DCMT 070208).
When paired with high-performance carbide inserts featuring a positive rake clearance angle and advanced chipbreaker geometries, this tool system handles severe radial forces seamlessly. The geometric chipbreaker configuration ensures that long, continuous metallic swarf is instantly broken into tightly curled, segmented chips. This prevents chip packing or nesting inside deep bores, shielding the newly machined inner wall from scratching and preventing catastrophic chip-inflicted tool failure.
2. Key Features & Hardcore Advantages
- Induction Hardened Steel Substrate: Heat-treated to HRC 42-45 to withstand heavy mechanical shock and mitigate high radial vibrations.
- Left-Hand (LH) Turret Orientation: Specialized geometry for back-boring, reverse spindle cycles, or matching symmetrical twin-spindle machining operations.
- 93-Degree Dynamic Clearance Lead Angle: Allows clean execution of internal steps, square shoulders, and precise continuous profiling close to the center line.
- Chemical Anti-Corrosion Black Coating: Premium industrial blackened surface treatment repels friction, avoids hot swarf adhesion, and extends the service life of the bar body.
Model Nomenclature Decoder: S16Q-SDUCL07
Steel Shank Body
16mm Shank Dia.
180mm Total Length
Screw Clamping System
55 Degree Diamond Shape
93 Degree Clearance Angle
7 Degree Relief Angle
Left Hand Orientation
7mm Insert Edge Size
Need the Mirrored Right-Hand (R) Unit to Setup Your Symmetrical Lathe Turret?
Explore the S16Q-SDUCR07 (Right Hand) Tool Holder →3. Technical Specifications & Metric-to-Imperial Values
| Technical Parameter | Metric Value (S16Q-SDUCL07) | Imperial / Inch Equivalent Code |
|---|---|---|
| Shank Diameter | 16 mm | ~ 0.6299 inches (Closest US standard: 5/8" profile / A10-SDUCL2) |
| Overall Length | 180 mm | ~ 7.0866 inches |
| Minimum Bore Clearance | 20 mm | ~ 0.7874 inches |
| Matching Insert Standard | DCMT 070202 / DCMT 070204 / DCMT 070208 | DCMT 21.50.5 / DCMT 21.51 / DCMT 21.52 |
| Mounting Torx Hardware | M2.5 x 6mm Insert Screw + T8 Torx Driver | High-Tensile M2.5 Screw + T8 Flag Key |
Optimal Industrial Cutting Speed & Feed Rate Recommendation
| ISO Workpiece Material Classification | Recommended Cutting Speed (Vc) | Feed Rate Target Range (f) |
|---|---|---|
| Carbon / Alloy Steels (P-Class) | 140 - 240 m/min | 0.04 - 0.15 mm/rev |
| Stainless Steel Varieties (M-Class) | 90 - 180 m/min | 0.03 - 0.12 mm/rev |
| Cast Iron & Nodular Matrix (K-Class) | 100 - 200 m/min | 0.04 - 0.18 mm/rev |
4. Product Application Scenarios
- Left-Hand Internal Profiling: Specifically engineered for machining deep reverse profiles, internal recesses, and precision counterbores from the back face.
- Precision Blind Hole Boring: Designed to maintain strict dimensional tolerances in compact bores, preventing chatter over typical 3xD to 4xD overhang cycles.
- Multi-Axis CNC Lathe Setups: Excellent for multi-tasking machines or twin-spindle configurations requiring a left-hand cutting block vector.
5. Equipment & Tooling Compatibility
- CNC Turning Centers: Seamless integration into standard 16mm turret stations, gang tool plates, or heavy-duty boring bar sleeves.
- Tool Posts & Lathes: Fully compatible with quick-change tool posts (QCTP), Aloris-style tool holders, and automated horizontal tool blocks.
- Standard ISO Indexable Seats: Form-fitted for all 55-degree positive rhombic DCMT 0702-- carbide or cermet inserts.
6. BEYOND Brand Premium Grade Selection Guide
Optimize your machining performance by selecting the ideal BEYOND insert grade matching your specific application:
| BEYOND Insert Grade | Coating Architecture & Substrate | Material Matrix Focus |
|---|---|---|
| BYM11 (CVD Grade) | Thick Multilayer TiN + Al2O3 Thermal Shield | Outstanding tool life during high-speed continuous internal turning of carbon steel, alloy steels, and pre-hardened tool metals. |
| BYS25 (PVD Grade) | Nano-Structured TiAlN Ultra-Hard Wear Coat | High thermal defense profile. Ideal for interrupted cuts, tough scale layers, and 304/316 austenitic stainless steels. |
| BYK15 (Uncoated Grade) | Mirror-Polished Micro-Grain Carbide Substrate | Prevents built-up edge (BUE). Built for high-speed turned paths in aluminum alloys, brass, copper, and structural polymers. |
7. Why Choose BEYOND CNC Tools?
BEYOND delivers world-class, industrial-grade metal cutting solutions designed to maintain tight micro-tolerances under harsh workshop parameters. By utilizing high-tensile alloy chemistry, specialized heat treatments, and precision CNC-ground insert pockets, we guarantee maximum structural dampening, reduced flank wear, and minimized machining downtime on your workshop floor.
Global Machinist Feedback
Robert V. — United States
"Outstanding rigidity for a 16mm left-hand bar. Did a series of deep back-boring cycles on 4140 chrome-moly steel. Absolute zero chatter and hit a superb surface finish."
Dieter M. — Germany
"Sehr gut verarbeitet. The DCMT0702 pocket seating is beautifully ground and flush aligned. Perfect left-hand orientation execution on our indexable turret."
Giuseppe T. — Italy
"Utensile robusto e preciso. The clearance angle allows excellent internal shoulder profiling. Swarf evacuates easily even from narrow blind holes."
Yukihiro S. — Japan
"Used on our automated sub-spindle setups for back facing. Very durable alloy body, insert screw thread handles continuous high torque adjustments flawlessly."
Carlos M. — Mexico
"Excellent price-to-performance ratio. Holds the tight tolerances we need for hydraulic valve bodies. Will definitely restock this BEYOND tool bar."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the recommended maximum stable overhang for this 16mm steel boring bar?
A1: For standard high-tensile steel shank tool holders, the engineering thumb rule is an overhang depth up to 4x the shank diameter (4xD). For this 16mm bar, you can stably run depths up to 64mm without experiencing harmonic chatter.
Q2: Can I use DCMT 11T3 inserts with this tool holder?
A2: No. The pocket geometry of the S16Q-SDUCL07 is explicitly milled for the smaller DCMT 0702-- (7mm cutting edge length) insert. Attempting to fit a larger 11mm insert will ruin the seating alignment and fail to lock.
Q3: Why choose a left-hand (SDUCL) bar over a right-hand (SDUCR) model?
A3: Left-hand boring bars are essential when machining on lathes where the turret is located on the operator side, for reverse spindle setups, or for specific inner profiling operations that feed outward/back-facing from the chuck.
9. Technical Maintenance & Diagnostic Guidelines
Equivalent Industry Models
Fully interchangeable with universal ISO metric standard catalog designation code S16Q-SDUCL07. Serves as a heavy-duty drop-in replacement for any global 16mm or 5/8-inch Left-Hand tool holder configuration carrying 55-degree positive diamond profiles.
Troubleshooting Tips
Micro-Vibration / Chatter: Ensure the chucking engagement length of the shank is at least 3x the diameter. If possible, lower the nose radius of your insert (e.g., from 0.4mm to 0.2mm) to reduce radial push.
Premature Pocket Wear: Check the screw torque. Ensure the pocket is cleared of microscopic carbon fines using compressed air before locking down a new insert.
Workpiece Material Matrix
Engineered to operate seamlessly across high-frequency industrial metal categories: P (Carbon & Structural Alloy Steels), M (Stainless Steel series), K (Grey & Ductile Cast Irons), N (Aluminum alloys & Copper lines), and S (High-temperature 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.