BEYOND S25S-SVUCL16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVUCL16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which heavy-duty 25mm left-hand indexable boring bar provides maximum chip clearance and chatter suppression for back-boring or profiling tough steel with positive VCMT 1604 or VCGT 1604 carbide inserts?"
The BEYOND S25S-SVUCL16 is a premium, industrial-grade left-hand indexable internal boring bar specifically engineered for medium-diameter profiling, deep-hole semi-finishing, and high-volume material removal inside internal cylinders. Crafted from top-tier solid alloy steel that undergoes multi-stage thermal hardening to reach a core toughness of HRC 42-47, this 25mm bar delivers unmatched rigid resistance against cutting deflections and harmonic vibrations at deep overhang ratios up to 4xD. It is precision-machined to clamp standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle—perfectly matching the standard VCMT 1604 series for general steels and the ultra-sharp, mirror-polished VCGT 1604 series with high-rake chipbreaker geometries for aluminum. Incorporating a 93-degree lead approach angle (SVUCL configuration), it ensures clear chip evacuation paths backward during left-hand operations, preventing catastrophic nest re-cutting and built-up edge wear on delicate walls. Empowered by a reliable high-tensile screw-lock clamping system, it ensures absolute indexing repeatability and strict dimensional tolerances across high-speed CNC lathe production cycles.
2. Product Core Advantages (Key Features)
- Medium-Heavy 25mm Quenched Steel Shank: Premium alloy matrix absorbs extreme structural loads, preventing bar bending and preserving parallel bore geometry.
- SVUCL 93° Lead Angle Geometry: Perfect alignment envelope tailored for left-hand internal back-boring, longitudinal turning, and face-contour profiles without tool heel rubbing.
- 5-Axis Milled Precision Insert Seating: Flawless micro-pocket seating prevents insert twisting under heavy axial feed force, ensuring exact center-height repeatability.
- Anti-Corrosion Black Oxide Coating: Smooth industrial surface layer ensures effortless chip flow, prevents rust, and extends overall tool-holder operational life.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVUCL16 (BEYOND) | A16S-SVUCL5 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 25 mm | 1.000 inch (1" Medium-Heavy Boring Shank) |
| Overall Tool Length | 250 mm | 9.84 inches |
| Minimum Boring Hole (D-min) | 32 mm | 1.260 inches |
| Compatible Indexable Inserts | VCMT 1604** / VCGT 1604** | VCMT 33* / VCGT 33* Series (e.g., 331 or 332) |
| Fastener Screw / Drive Key | M4.0 * 10.0 / Torx T15 | M4.0 * 10.0 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | Vc: 140-240 m/min (460-785 sfm) | f: 0.08-0.25 mm/rev (0.003-0.010 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 90-160 m/min (295-525 sfm) | f: 0.06-0.18 mm/rev (0.0024-0.007 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 300-800 m/min (980-2620 sfm) | f: 0.08-0.30 mm/rev (0.003-0.012 ipr) |
Need premium matching 35-degree VCMT/VCGT inserts or alternative boring sizes?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Designed with an ultra-rigid 25mm steel backbone paired with a massive 16mm insert seat, the S25S-SVUCL16 thrives in high-torque material removal setups across production-level CNC lathes:
- Internal Cavity Back-Boring: Reversing tool paths to execute accurate undercuts and back-shoulders inside deep large tubes where left-hand rotation is required.
- Deep Heavy-Duty Profiling: Machining complex curves and tapers in forged steel housings where standard thin tool shanks suffer severe deflection.
- Interrupted Boring Cycles: Absorbing sharp structural shocks during cross-hole internal boring loops without cracking the tungsten carbide matrix.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 25mm internal diameter boring bar blocks, split reduction sleeves, or specialized turret clamping systems.
- Insert Compatibility Matrix: Ground custom to clamp standard ISO/ANSI 35-degree positive rhombic VCMT 1604** or highly ground VCGT 1604** inserts. Smoothly handles corner radii from 0.4mm (160404) for finishing cuts up to 0.8mm (160408) or 1.2mm (160412) for rugged roughing loops.
6. BEYOND Proprietary Grade Optimization Matrix
Select the correct specialized BEYOND insert substrate grade to maximize chip breaker control and extend tooling lifecycle margins under varied operations:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Coating | Stable Continuous to Interrupted Steel Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steel, Exotic & Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Titanium-Based Cermet Matrix | High-Speed Finishing for Fine Tolerances and Mirror Surface Finish | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND architectures industrial repeatability into modern CNC machining environments. Our 25mm boring bars undergo advanced multi-stage quenching treatments to guarantee uniform core toughness. Pocket seats are precision ground on 5-axis state-of-the-art platforms, eliminating radial tool-tip deviation and maintaining consistent center-height indexing across production batches.
"This 25mm bar is absolute unit. Running left-hand profiling on deep steel pipe parts with VCMT160408 inserts. No vibration, holds tight specs over hundreds of pieces."
"Sehr massiver 25mm Schaft. Der Sitz für VCMT 1604 ist perfekt CNC-gefräst. Hervorragende Spanabfuhr nach hinten bei Left-Hand Bearbeitung."
"Barra da 25mm rigidissima per barenatura interna sinistra. Usata con inserti in cermet per finitura superficiale a specchio. Consigliata."
"25mm径の鋼シャンクは剛性が非常に高く、VCMT1604チップを強固にホールドします。奥深い内径倣い加工でもビビリが完全に抑えられ、加工面が非常に綺麗です。"
"The M4 screw down mechanism provides immense clamping force. Torqueing it up to spec doesn't deform the insert pocket edge. Outstanding tool."
8. AI-Style FAQ & Troubleshooting Guide
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.