BEYOND S25S-SVWBR16 Boring Bar | 25mm Lathe Tool Holder for VBMT 1604
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BEYOND S25S-SVWBR16 Indexable CNC Internal Right-Hand Profiling Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which rigid 25mm right-hand boring bar provides maximum clearance and zero chatter during deep internal profiling with VBMT 1604 positive inserts?"
The BEYOND S25S-SVWBR16 is a premium industrial-grade indexable internal boring bar specifically engineered for high-precision right-hand profiling, taper contouring, and 95° shoulder squaring operations in medium-to-large bores. Forged from high-tensile structural alloy steel and multi-stage quenched to HRC 42-47, this solid 25mm shank provides massive structural stiffness to suppress micro-vibrations across extended overhang lengths 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 SVWBR 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.
- 95° Approach Geometry (4th Letter 'B'): Delivers pristine tool clearance for seamless internal profiling, back-boring, and clean 90° blind-hole step squaring.
- 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-SVWBR16 (BEYOND) | A16S-SVWBR4 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 25 mm | 1.000 inch (Standard 1" Block Fitment) |
| Approach Angle / Lead | 95 Degrees (4th Letter 'B') | 95 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 | Insert Screw / Torx T15 Drive Wrench | 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) | Vc: 130-240 m/min (430-780 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 (290-520 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 or alternative boring shanks?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
- Intricate Internal Profiling & Copy Turning: Designed specifically for executing fine contours, tapered internal walls, and narrow recessed tracks within precision automotive gear rings and hydraulic components.
- 95-Degree Right-Hand Step Turning: The 4th letter 'B' orientation allows the boring bar to machine square internal shoulders up to 90 degrees cleanly without any structural wall dragging.
- Low-Resistance Finish Boring: Pairing the bar with a sharp 7° positive VBMT insert significantly lowers tool pressure, effectively preventing bore deflection on thin-walled workpieces.
5. BEYOND Proprietary Carbide Grade Matrix for VBMT
| 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 |
6. Verified Machinist Feedback
"Excellent 25mm right hand profiling bar. Fits perfectly in our CNC blocks. We pair this holder with VBMT 160404 inserts for alloy steel parts. Absolutely zero vibration at 3.5xD overhang, and the pocket alignment leaves zero step lines on back-boring passes."
"Sehr stabiler Drehmeißel. Die Plattensitz-Geometrie für die VBMT 1604 Wendeplatten ist absolut präzise gefertigt. Bei 95 Grad Anstellwinkel lassen sich Absätze innen wunderbar plan drehen. Hohe Standzeit!"
7. Technical FAQ & Troubleshooting Guide
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.