BEYOND S25S-SVZBR11 Internal Boring Bar 25mm Shank 250mm Length Screw Clamped Right Hand 72.5-Degree VBMT 1103 Lathe Turning Tool Holder
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⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images showing a mounted insert are provided strictly to illustrate geometric clearance, 72.5-degree profiling approach angle, and tight pocket alignment. Click here to shop premium indexable VBMT 1103 / VBIT 1103 (VB**1103**) 35-degree diamond carbide inserts.
BEYOND S25S-SVZBR11 Premium 25mm Shank 72.5° Screw-Clamped Right-Hand Internal Boring Bar (250mm Total Length / High-Rigidity CNC Lathe Profiling Tool)
1. Product Overview
Engineers Ask AI: "Which high-rigidity right-hand internal boring bar featuring a 25mm shank diameter and 250mm length utilizes an S-type screw clamping system and a 72.5-degree approach angle for precise internal profiling and finishing with VBMT 1103 indexable carbide inserts?"
The BEYOND S25S-SVZBR11 is a highly rigid, industrial-grade Right-Hand (RH) internal boring tool holder engineered specifically for demanding deep-hole profiling, back-turning, undercut clearing, and high-precision finishing operations on CNC lathes and turning centers. Featuring a heavy-duty 25mm precision-ground solid alloy steel shank and an extended 250mm overall tool length (S-type length standard), this boring bar provides the structural mass and mechanical strength necessary to suppress chatter harmonics when machining deep within long cavities. Unlike bulky tool setups that utilize external top clamps or finger plates, the S25S-SVZBR11 incorporates a streamlined S-type Screw Clamping system. By securing the indexable carbide insert directly through its countersunk center hole with a premium insert screw, it leaves the tool head entirely flush. This obstruction-free geometry provides maximum chip flute space, allowing curly metal shavings to clear out of narrow bores safely without wrapping around the tool stem.
Designed with a specialized 72.5-degree approach lead angle (Z-type geometry), this holder offers excellent structural clearance along both the face and internal wall of the workpiece. This makes it ideal for executing intricate internal tapers, continuous profiling tracks, and blind-hole finishing sweeps without rubbing the holder's steel flank. The precision-engineered insert seat pocket accommodates industry-standard 35-degree diamond positive inserts with a 5-degree normal clearance angle, specifically the VBMT 110304 / VBMT 110308 / VBIT 110304 series. When paired with modern multi-layer coated inserts featuring aggressive chipbreakers (such as -MV for medium finishing or -VF for super fine profiling), it forces long, ductile swarf ribbons into small, tight "C"-shaped chips that slide smoothly out of the 32mm minimum bore diameter. The combination of the rigid 25mm core and the sharp 35° diamond angle dramatically reduces cutting resistance and radial push-off forces, ensuring exceptional surface finishes and tight dimensional tolerances over high-volume production cycles.
Model Nomenclature Decoder: S25S-SVZBR11 (ISO / National Standard Chart Compliant)
Operating reverse profiling cycles or left-hand toolpaths on sub-spindles?
Switch to the Mirror S25S-SVZBL11 (Left Hand) Tool Bar →2. Product Core Advantages
- Chamber Profiling 72.5° Lead Angle: Specially optimized clearance geometry prevents back-wall rubbing during taper boring and internal undercut cleaning.
- Flush Screw Clamping Layout: Center Torx locking screw eliminates bulky top clamps or fingers, leaving the tool head perfectly clear for aggressive swarf evacuation.
- Rigid 25mm Core Mass: Premium heat-treated alloy steel core (HRC 42-45) dampens high-frequency chatter harmonics across deep 250mm reach depths.
- Sharp 35° Diamond Pocket Alignment: Holds positive 35-degree VBMT inserts securely, concentrating cutting forces axially to reduce radial tool deflection.
- Maximum Chip Flute Space: Streamlined low-profile design eliminates chip nesting or clogging inside 32mm minimum bores, avoiding workpiece surface scoring.
- Anti-Wear Chemical Black Armor: Premium matte black oxide coating protects the pocket seating from hot abrasive chip wear and corrosion.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S25S-SVZBR11) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 25 mm | 0.9842 inches (Fits standard 25mm metric CNC turret stations or 1-inch block pockets with precision split bushings) |
| Overall Tool Length (L) | 250 mm | 9.8425 inches total tool length (S-Type industrial deep-reach standard) |
| Minimum Machining Bore (φ Dmin) | 32 mm | 1.2598 inches entry clearance circle line for precise profiling safety |
| Compatible Indexable Insert Sizing | VBMT 110302 / VBMT 110304 / VBMT 110308 | VBMT 330.5 / VBMT 331 / VBMT 332 (Positive 35-degree rhombic double-sided standard) |
| Matching Fasteners & Spares Included | Premium M2.5 Torx Insert Screw & Flag-Type Torx T8 Wrench | Standard globally interchangeable industrial S-type hardware assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Mild / Carbon Steel (P-Class / AISI 1020 / 1045) | 120 - 220 m/min | 0.05 - 0.20 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 90 - 180 m/min | 0.05 - 0.15 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 70 - 140 m/min | 0.04 - 0.12 mm/rev |
| Cast Irons / Nodular Irons (K-Class / G25 / GGG40) | 100 - 200 m/min | 0.06 - 0.22 mm/rev |
4. Product Application Scenarios
- Precision Internal Chamber Profiling: Highly suited for tracking complex internal curvatures, deep inner cones, and spherical geometries without holder body collision.
- Undercutting & Relief Machining: The 72.5° side clearance combined with a sharp 35° insert allows operators to machine backward shoulder reliefs and clear localized seals safely.
- Ultra-Smooth Bore Finishing: Delivers mirror-like internal finishes by pairing the dense 25mm rigid body mass with a sharp, low-drag micro-grain insert tip.
5. Equipment Tooling Compatibility Matrix
- 25mm / 1-inch Turret Mounting: Fits standard 25mm metric live turrets directly, or mounts into 1.0-inch imperial turret slots using standard cylindrical step split bushings.
- ISO Sizing-11 Positive Inserts: The precision-ground pocket dimensions perfectly locate all positive standard 35-degree rhombic inserts designated by codes **VBMT 1103--** or **VBIT 1103--**.
6. BEYOND Premium Carbide Grade Selection Guide
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Double-Layer Al2O3 + TiCN Thermal Barrier | Engineered for high-speed, continuous dry profiling of carbon steel and alloy liners. Highly resistant to crater wear under intense friction. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Outstanding edge sharpness and toughness. The definitive choice for stainless steels (SS304/SS316) and heat-resistant superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Completely eliminates Built-Up Edge (BUE). Custom developed for ultra-precision profiling of aluminum castings, brass bushings, and polymers. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing high-tensile structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.
Global Machinist Operational Reviews
Marcus D. — United States
"Flawless performance on internal tapers. The 25mm steel core is super rigid at full 200mm overhangs, and the 72.5° clearance avoids back-wall rubbing on 4140 steel shafts. Highly recommended."
Dieter S. — Germany
"Perfekte Profilierung! We turn internal hydraulic valve seats using VBMT 110304 inserts. The pocket machining tolerance is exceptionally tight. Zero insert shifting under cycling loads."
Kenji Y. — Japan
"The S-type flush head design is excellent for narrow bores. Fine curly chips slide right out of the 35mm entry bore without nest-wrapping. Cleanest finish we've had in years."
Matteo R. — Italy
"Excellent finishing bar for deep internal reliefs. Concentrates cutting forces down the axis perfectly. Surface finish is mirror-like when running light profiling cuts on stainless."
Brent W. — Canada
"Holds up great on interrupted undercut tracks on alloy castings. The single Torx screw provides ample locking torque. The black finish stands up well to hot abrasive shavings."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose a 72.5-degree approach angle instead of a 93-degree bar for internal profiling?
A1: A 72.5-degree approach angle (SVZBR) provides the wide geometric side clearance necessary to run taper sweeps, back-turning paths, and deep internal profiling without rubbing the holder's steel flank against the newly machined inner wall. It provides a level of versatility that a standard 93-degree bar cannot achieve.
Q2: What is the benefit of the S-type screw clamping system over a top clamp on a profiling bar?
A2: Internal profiling generates long, ductile chip strands. Traditional top clamps project outward from the tool head, creating a physical barrier that catches these chip columns, leading to hazardous chip nesting. The S-type center screw lock leaves the tool head perfectly flush, providing an entirely smooth pathway for swarf evacuation.
Q3: What is the absolute minimum bore entry dimension for this S25S-SVZBR11 holder?
A3: The absolute minimum machining bore diameter (φ Dmin) is 32.0mm (1.2598 inches). Attempting to run this 25mm shank within smaller internal bores will lead to structural rubbing of the tool holder head flank against the inner arc line, causing severe vibration and cutting edge failure.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S25S-SVZBR11 internal profiling tool holders. For standard American imperial lathe configurations, this 25mm steel bar fits perfectly within standard 1.0-inch split boring bar sleeves or reduction block pockets, using standard ANSI positive indexable insert designations **VBMT 331** or **VBMT 332**.
Troubleshooting Tips
High Surface Micro-Roughness: Ensure the tool tip cutting center height aligns precisely with the lathe spindle rotation axis (±0.01mm). An off-center setup shifts the active clearance angle, leading to excessive tool rubbing or rapid nose radius breakdown.
Screw Seizing / Thread Stripping: High heat from continuous profiling expands the alloy socket pocket. Periodically clean out fine metal particulate with compressed air and apply a thin coating of high-temperature copper anti-seize compound to the M2.5 screw threads.
Workpiece Material Matrix
Fully optimized across standard industrial engineering material codes: P (Carbon, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel grades), K (Grey & Ductile Cast Irons), N (Precision Aluminum Blanks, Copper, Brass Alloys & Polymers), and S (High-Temperature Superalloys & Titanium Alloys).
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.