BEYOND S25S-SVXCL16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVXCL16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which 25mm left-hand indexable boring bar provides optimal flank clearance and high rigidity for back-boring or reverse internal profiling using 35-degree VCMT or VCGT 1604 inserts?"
The BEYOND S25S-SVXCL16 is a professional-grade, high-rigidity left-hand indexable internal boring bar engineered for demanding profiling, back-boring, and semi-finishing operations on CNC lathes. Vacuum-quenched to optimize its core microstructure and mechanical toughness, this high-mass 25mm diameter tool holder provides exceptional dynamic stability, making it highly effective at neutralizing harmonic vibrations across extended deep-hole overhangs up to 4xD. It is specifically designed to accept standard 35-degree rhombic indexable inserts—such as the VCMT 1604 and VCGT 1604 series. By positioning a 35° diamond profile at a precise 113-degree approach angle, this geometry offers excellent flank clearance, enabling machinists to execute steep internal tapers, deep undercuts, and intricate profiling cuts where standard 55° or 80° bars would experience heel rub. Secured by a highly rigid screw-down clamping mechanism, it ensures optimal pocket positioning under variable chip loads, resulting in superior geometric repeatability and excellent surface finishes.
2. Product Core Advantages (Key Features)
- Premium Vacuum-Heat Treated Alloy Steel (HRC 42-47): Heavy-duty, high-tensile steel shank absorbs harmonic chatter during long-reach internal operations, ensuring dimensional accuracy.
- SVXCL 113-Degree Lead Angle Engineering: Specifically designed for left-hand deep undercutting, reverse internal contours, and back-boring. The narrow 35° insert profile allows smooth tracing of intricate contours without tool deflection or dragging.
- Precision-Machined Insert Pocket: Flawlessly micro-milled seating ensures uniform contact along the VCMT/VCGT insert edges, maximizing insert tool life and reducing edge chipping.
- Anti-Wear Matte Black Oxide Skin: Advanced anti-corrosion chemical coating shields the bar from rust, moisture, and chip welding when subjected to high-temperature friction or aggressive water-soluble coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVXCL16 (BEYOND) | A16S-SVXCL3 (Standard Inch Style) |
| Shank/Clamping Diameter | 25 mm | 1.000 inch (1" Round Boring Bar) |
| Overall Tool Length | 250 mm | 9.84 inches |
| Minimum Boring Hole (D-min) | 32 mm | 1.260 inch |
| Compatible Indexable Inserts | VCMT 1604** / VCGT 1604** | VCMT 33* / VCGT 33* Series (e.g., 331 or 332) |
| Fastener Screw / Drive Key | M3.5 * 9.0 / Torx T15 | M3.5 * 9.0 / 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: 140-260 m/min (460-850 sfm) | f: 0.08-0.25 mm/rev (0.003-0.010 ipr) |
| Stainless Steel Alloys (M-Class / 316) | Vc: 100-180 m/min (330-590 sfm) | f: 0.06-0.18 mm/rev (0.0024-0.007 ipr) |
| Aluminum & Copper Alloys (N-Class) | Vc: 200-500 m/min (650-1640 sfm) | f: 0.08-0.30 mm/rev (0.003-0.012 ipr) |
Looking for premium matching 35-degree VCMT/VCGT inserts or alternative sizes?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Combining a high-rigidity 25mm shank with a high-precision 16mm insert pocket, the S25S-SVXCL16 is optimized for modern CNC lathes and multi-tasking turning centers:
- Internal Taper & Contour Profiling: Tracing complex inside curves and tight geometric transitions down to a 32mm entry diameter with zero chatter.
- High-Depth Back-Boring (Left-Hand): Reaching past large internal shoulder walls in a left-hand orientation to machine rear faces and wide relief undercuts under heavy chip loads.
- Precision Automotive & Hydraulic Valve Machining: Creating fine finishes on multi-step fluid ports and smooth chamfer seating zones inside carbon steel castings and forgings.
5. Equipment & Tool Compatibility
- CNC Machine Integration: Clamps securely into standard 25mm block holders, boring sleeves, split bushings, or CNC turret clamping blocks.
- Insert Standardization: Universally compatible with all ISO/ANSI standard 35° diamond profile inserts with thick cross-sections, accepting VCMT 160404, VCMT 160408, and mirror-polished VCGT variants for high-speed aluminum machining.
6. BEYOND Proprietary Grade Optimization Matrix
Equip your boring bar with the correct BEYOND specialized insert grade to guarantee chip breaker functionality and extended tool lifecycle margins:
| 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 is dedicated to building structural reliability into high-performance CNC machining workflows. Our S25S-SVXCL16 boring bars are ground on high-accuracy 5-axis platforms to guarantee the pocket seating angle matches standard ISO positions. This tight manufacturing tolerance minimizes radial tool-tip runout and secures accurate tool center-height positions during automated cell changeovers.
"Perfect 25mm left hand tool holder for back boring routines on our sub-spindle setups. Holds the VCMT 1604 insert rigidly with zero chatter."
"Ausgezeichnete Stabilität. Der Plattensitz für VCMT ist präzise gefräst. Der Spanfluss bei tiefer Innenbearbeitung ist tadellos."
"Ottimo stelo da 25mm sinistro. Ideale per la profilatura interna profonda dove serve un angolo di scarico ottimale."
"内径逆倣い加工用に左勝手(L)を購入。25mmシャンクの剛性もしっかりしており、VCMT1604チップとの相性も抜群です。"
"The black matte surface finish repels chip welding extremely well during high temperature deep-hole boring runs."
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.