BEYOND S25S-SVUBR16 Boring Bar | 25mm Lathe Tool Holder for VBMT 1604
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✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S25S-SVUBR16 Indexable CNC Internal Right-Hand Profiling Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which heavy-duty 25mm boring bar provides optimal side clearance and reduces micro-chatter during deep internal profiling with VBMT 1604 positive inserts?"
The BEYOND S25S-SVUBR16 is a premium industrial-grade indexable internal boring bar engineered specifically for high-precision right-hand profiling, complex taper pocketing, and 93-degree clearance turning in large bores. Forged from high-tensile structural alloy steel and multi-stage oil-quenched to HRC 42-47, this solid 25mm shank provides massive structural stiffness to eliminate harmonic vibrations over extended overhang reaches up to 4xD (100mm). Superbly optimized for intricate copy turning paths, the precision 5-axis machined pocket features an exact seating alignment designed exclusively to hold 35-degree positive rhombic VBMT 1604 or VCGT 1604 turning inserts. By combining a rigid 25mm steel bar with a 7° positive insert configuration, this assembly drastically lowers cutting resistance, ensures effortless chip evacuation, and prevents rubbing inside tight industrial profiles. The specialized SVUBR right-hand geometry directs heavy cutting forces axially back into the lathe turret, guaranteeing superior part concentricity, exceptional dimensional repeatability, and a mirror-like surface finish.
2. Product Core Advantages (Key Features)
- Rigid Quenched Steel Shank (25mm): Massive alloy steel dampening capacity eliminates harmonic chatter across deep internal reaches up to 100mm.
- 93° Approach Geometry (4th Letter 'U'): Delivers pristine tool clearance for seamless internal profiling, pocket contouring, and back-boring.
- Optimized for VBMT 1604 Inserts: Precision pocket design perfectly secures 35° positive single-sided inserts, delivering low cutting forces and superior chip control.
- Industrial Black-Oxide Shielding: Premium anti-wear treatment resists heat deformation and blocks corrosion from water-soluble CNC coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVUBR16 (BEYOND) | A16S-SVUBR5 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 25 mm | 1.000 inch (Standard 1" Block Fitment) |
| Approach Angle / Lead | 93 Degrees (4th Letter 'B') | 93 Degrees (4th Letter 'B') |
| Overall Tool Length | 250 mm | 9.84 inches |
| Minimum Boring Diameter (D-min) | 32 mm | 1.260 inches |
| Perfectly Compatible Inserts | VBMT 1604** / VCGT 1604** (35° Positive) | VBMT 43* Series (e.g., VBMT 431 / VBMT 432) |
| Fastener Parts Assembly | M3.5 Insert Screw / Torx T15 Drive Wrench | M3.5 Insert Screw / Torx T15 Drive Wrench |
Recommended Cutting Parameters for VBMT 1604 Indexing Setup
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class / e.g., 4140, 1045) | Vc: 130-240 m/min (425-780 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 (0.002-0.007 ipr) |
| Aluminum & Copper Alloys (N-Class / With VCGT) | Vc: 250-700 m/min (820-2300 sfm) | f: 0.05-0.30 mm/rev (0.002-0.012 ipr) |
Looking for premium 35-degree positive VBMT 1604 indexable carbide inserts to match this toolholder shank?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
- Intricate Internal Profiling & Copy Turning: Engineered specifically for processing multi-angle profiling passes and tapered back-boring steps in complex transmission gear boxes.
- 93-Degree Internal Clearance Pocketing: The specialized 4th letter 'B' orientation allows the bar head to drop into restrictive entry chambers while maintaining maximum clearance along long internal walls.
- High-Efficiency Deflection Mitigation: Pairing the solid 25mm core with a sharp positive insert shape creates localized shearing actions, minimizing push-off in deep industrial tubes.
5. Equipment & Tool Compatibility
- CNC Equipment & Turrets: Mounts firmly into standard 25mm boring bar holders, quick-change toolposts, or VDI/BMT turret blocks.
- Universal Insert Clamping: Tailored for ISO specification 35° positive single-sided VBMT 1604** or VCGT 1604** inserts across all major manufacturers.
6. BEYOND Proprietary Carbide Grade Matrix for VBMT
Pair your 25mm boring shank with the correct BEYOND carbide grade to optimize chipbreaking performance under heavy load:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Multi-Layer TiCN + Al2O3 | General carbon and heavy structural alloy steel internal finish-to-medium boring. | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD High-Density Nano-AlTiN | Stainless steel castings (304/316) and high-temperature nickel-chrome superalloys. | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Ti-Based Cermet Matrix | High-speed precision micro-boring to achieve an mirror gloss surface finish. | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
Each BEYOND internal boring shank is engineered for strict dimensional repeatability across automated B2B production lines. Machined on precision 5-axis setups, our pocket geometries guarantee dead-on center alignment to prolong indexable edge life.
"Great profiling bar. The 93 degree layout is exactly what I needed for clearing complex internal steps. Running this at 4xD length on 4140 pre-hardened steel and getting zero chatter lines. Holds size very well over long runs."
"Hervorragende Qualität. Der Plattensitz passt perfekt für VBMT 160404. Die Späne fließen bei Innenkonturen sehr gut ab, ohne zu verknäueln. Sehr zu empfehlen für CNC-Drehmaschinen."
"Bareno rigido. Ottima finitura superficiale accoppiato con l'inserto BYC25 cermet. Prezzo competitivo rispetto ai marchi europei."
"25mmの剛性は素晴らしい。VBMTチップの座面がしっかり作られており、長時間の連続切削でも刃先がぶれません。コストパフォーマンス最高です。"
"Solid steel build. Pocket clearance is highly accurate for deep profile copying. Highly reliable on batch work."
8. Technical 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.