BEYOND S25S-SVWCR16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVWCR16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which heavy-duty 25mm right-hand indexable boring bar provides optimal back-boring clearance and superior stability for high-feed profiling using 35-degree positive VCMT 1604 or VCGT 1604 carbide inserts?"
The BEYOND S25S-SVWCR16 is a premium, industrial-grade right-hand indexable internal boring bar engineered for demanding profiling, semi-finishing, and high-volume material removal inside large bores. Built from a robust 25mm solid alloy steel shank subjected to advanced multi-stage tempering to achieve a core hardness of HRC 42-47, this tool holder effectively dampens high-frequency harmonic vibrations and eliminates chatter during deep internal machining up to 4xD overhang. It is specifically designed to accommodate standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle—including the standard VCMT 1604 series and the free-cutting, polished ground VCGT 1604 aluminum profiling series. Featuring a dedicated 72.5-degree approach angle (SVWCR configuration), it offers an optimal clearance envelope that prevents heel-rubbing and catastrophic tool dragging when executing deep internal contouring, step profiles, and intricate undercuts. Supported by a high-tensile screw-down design, it provides an uncompromising insert lock that withstands extreme radial forces, guaranteeing precise dimensional repeatability and superior surface finishes.
2. Product Core Advantages (Key Features)
- Rigid 25mm Quenched Alloy Steel Shank: High-density steel construction drastically minimizes elastic deflection under heavy chip loads, extending insert tool-life and maintaining straightness.
- SVWCR 72.5° Lead Angle Envelope: Purpose-built for right-hand internal copy turning and longitudinal profiling, allowing smooth entry and exit into deep shoulders with minimal radial push.
- Precision CNC Ground Insert Seating Pocket: Mirror-milled pocket alignment holds VCMT/VCGT 1604 inserts with absolute spatial accuracy, eliminating center-height migration and protecting the delicate 35° nose radius.
- Thermal-Chemical Matte Black Coating: Premium industrial surface treatment provides superb chip-evacuation slickness, limits built-up edge (BUE) formation, and resists high-pressure coolant erosion.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVWCR16 (BEYOND) | A16S-SVWCR4 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 25 mm | 1.000 inch (1" Standard Boring Shank) |
| Overall Tool Length | 250 mm | 9.84 inches |
| Minimum Boring Hole (D-min) | 35 mm | 1.378 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 a rigid 25mm steel backbone paired with a massive 16mm insert seat, the S25S-SVWCR16 thrives in heavy-duty structural metal removal setups across production-level CNC lathes:
- Internal Copy Profiling: Machining challenging internal profiles on large metal blanks where positive 35° VCMT inserts are preferred for low cutting forces and smooth chip fracture.
- High-Depth Step Boring: Turning crisp internal square shoulders and complex multi-diameter bores without facing structural chatter or tool taper.
- Medium-to-Rough Finishing Loops: Exploiting robust chip breaker geometries to fracture long, stringy chips inside deep steel bores, ensuring trouble-free automated operation.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 25mm ID internal turret blocks, direct tool clamps, or specialized split boring bar sleeves.
- Insert Compatibility Matrix: Custom ground to accept all standard ISO/ANSI 35-degree positive rhombic VCMT 1604** or high-rake VCGT 1604** inserts. Accommodates various corner radii from 0.4mm (160404) for finishing up to 0.8mm (160408) for roughing cuts.
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.
"Excellent 25mm bar for internal profiling. Running positive VCMT1604 inserts gives us a beautiful finish with almost zero chatter on deep bores. Solid build."
"Sehr stabiler 25mm Schaft. Der Plattensitz für VCMT 1604 ist perfekt gefräst. Späne fließen super ab und es gibt kein ratterndes Geräusch bei tiefen Bohrungen."
"Gambo da 25mm molto rigido. Usato con inserti VCGT lucidi per profilatura interna su alluminio. Prestazioni eccellenti, ottimo rapporto qualità-prezzo."
"VCMT1604チップの保持力が素晴らしいです。25mmの太いシャンクのおかげで、内径切削時のビビリが完全に止まりました。精度が出しやすいです。"
"The screw clamping mechanism is solid and handles heavy torque. The black oxide coating works nicely against synthetic emulsion coolants."
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.