BEYOND S12M-SVQBR11 Internal Boring Bar 12mm Shank 150mm Length Screw Clamped Right Hand 107.5-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, 107.5-degree back-turning approach angle, and positive insert pocket alignment. Click here to shop premium indexable VBMT 1103 / VCMT 1103 (VB**1103**) 35-degree diamond positive carbide inserts.
BEYOND S12M-SVQBR11 Premium 12mm Shank 107.5° Screw-Fastened Right-Hand Internal Boring Bar (150mm Total Length / Precision CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which rigid right-hand internal boring bar featuring a 12mm shank diameter and 150mm length utilizes an S-type screw-clamped pocket and a 107.5-degree approach angle for back-turning and relief profiling with VBMT 1103 indexable carbide inserts?"
The BEYOND S12M-SVQBR11 is a highly precise, industrial-grade Right-Hand (RH) internal boring tool holder expertly engineered for small-diameter bore processing, back-turning (reverse profiling), relief cutting, and intricate internal sculpting on CNC lathes and automated turning centers. Featuring a highly versatile 12mm precision cylindrical clamping shank and an optimized 150mm overall tool length (M-type standard), this unique holder bridges the critical gap between ultra-fine micro-bars and bulky heavy-duty shanks. It provides the maximum cross-sectional steel volume necessary to minimize tool deflection and micro-chatter while easily navigating narrow internal cavities. By incorporating the advanced S-type Screw Clamping system, the indexable insert is secured flush through its counter-sunk center hole without bulky upper clamps or bulky bridge assemblies. This creates an unhindered chip flute pathway, making it highly exceptional for narrow-bore machining where metal chip nests would otherwise trap cutting heat and score the workpiece wall.
With its specialized 107.5-degree approach lead angle (Q-type profiling geometry), the pocket alignment provides excellent clearance during back-turning paths, profiling cycles, and undercutting. It allows the tool to clear internal steps without rubbing against the workpiece face, effectively preventing radial deflection lines on slender workpieces. It is custom-machined to accommodate standard positive 7-degree relief 35-degree narrow diamond indexable inserts, specifically the globally interchangeable VBMT 110302 / VBMT 110304 / VCMT 110304 series. This positive clearance geometry ensures ultra-low cutting resistance and highly clean shearing actions. The streamlined screw-down head allows this 12mm tool holder to clean internal cavities down to an optimized 16mm minimum bore diameter. When paired with targeted positive chipbreaker geometries (such as polished -AL profiles for non-ferrous aluminum or moulded -PM/-HMP profiles for carbon steels), it tightly curls long swarf ribbons into crisp "C"-shaped chips, pushing them smoothly out of the narrow bore channel to preserve tight dimensional tolerances and mirror-like finishes.
Model Nomenclature Decoder: S12M-SVQBR11 (ISO / National Standard Chart Compliant)
Operating reverse profiling cycles or left-hand toolpaths on sub-spindles?
Switch to the Mirror S12M-SVQBL11 (Left Hand) Tool Bar →2. Product Core Advantages
- Advanced 107.5° Back-Turning Geometry: Specifically engineered for backward profiling, internal reliefs, and relief undercuts without tool body contact or rubbing.
- Rigid 12mm Steel Core: Vacuum heat-treated to HRC 42-45, delivering high mechanical stability to absorb cutting harmonics up to 3 to 4 times tool diameter reach.
- Optimal 35° Pocket Clearance: Combined with the low-profile S-type screw clamp, it provides maximum side clearance for complex multi-directional copying.
- Low-Force Positive Cutting Action: Designed for standard positive relief VBMT/VCMT inserts, providing clean shearing that prevents work-hardening in stainless steel and alloy blocks.
- Flush Header Design: Removes bulky top clamping plates to open wide chip channels inside tight 16mm minimum diameters, ensuring smooth chip evacuation.
- Anti-Wear Black Oxide Layer: Advanced chemical matte treatment protects the precision-machined insert pocket from abrasive hot chip wear.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S12M-SVQBR11) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 12 mm | 0.4724 inches (Fits standard 12mm gang blocks or 1/2-inch boring bar blocks utilizing precision reduction sleeves) |
| Overall Tool Length (L) | 150 mm | 5.9055 inches total tool length (M-Type precision reach series) |
| Minimum Machining Bore (φ Dmin) | 16 mm | 0.6299 inches entry clearance circle line for structural safety |
| Compatible Indexable Insert Sizing | VBMT 110302 / VBMT 110304 / VCMT 110304 | VBMT 221 / VBMT 222 / VCMT 221 (Positive 35-degree diamond standard) |
| Matching Fasteners & Spares Included | Precision M2.5 Center Insert Screw & Flag-Type Torx T8 Wrench | Standard globally interchangeable micro 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) | 110 - 180 m/min | 0.04 - 0.14 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 80 - 140 m/min | 0.03 - 0.12 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 60 - 110 m/min | 0.03 - 0.10 mm/rev |
| Aluminum Alloys / Brass (N-Class / Al6061 / C3604) | 180 - 450 m/min | 0.04 - 0.18 mm/rev |
4. Product Application Scenarios
- Precision Back-Turning & Reverse Profiling: The specialized 107.5-degree approach angle allows highly smooth backward cutting loops without heel rubbing.
- Internal Relief & Undercutting: Outstandingly designed for clean machining of O-ring grooves, internal thread reliefs, and complex multi-stepped internal paths.
- Small-Bore Precision Contouring: Delivers high rigidity and chip control on automated CNC lathe turrets for delicate or slender engine components.
5. Equipment Tooling Compatibility Matrix
- 12mm / 1/2-inch Turret Mounting: Fits directly into metric 12mm boring bar holders or handles standard 1/2-inch imperial lathe tool blocks using round reduction bushes.
- ISO Size-11 V-Geometric Inserts: Pocket seat securely hosts standard 35° narrow diamond positive inserts with a 5° or 7° relief designated by codes **VBMT 1103--** or **VCMT 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, high-temperature continuous dry profiling of carbon steel and cast irons. Extremely wear-resistant over long production runs. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Superior edge toughness. Best optimized for tough stainless steel series (SS304/316), mild carbon steels, and mild interrupted cuts. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE) formation. Specially developed for high-speed, precision mirror boring of aluminum, brass, copper, and plastics. |
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
David M. — United States
"Excellent back-turning bar. The 107.5-degree angle solves our undercut clearance issue completely. No tool body rubbing anymore. Holds tight tolerances on alloy steel housings."
Hans W. — Germany
"Perfekt für Freistiche! The 12mm shank handles deep internal reliefs with ease. The screw-clamp head configuration leaves great space for chips to escape without bird-nesting."
Yukihiro N. — Japan
"Very rigid steel core. Pocket indexability is spot on. We change out VBMT inserts frequently and the cutting tip returns perfectly to the centerline every time."
Giovanni F. — Italy
"Highly reliable boring bar for internal profiling. We run it on tough stainless steel castings. The low-profile screw head remains clean and doesn't gather swarf."
Alex B. — Canada
"The pocket sizing is incredibly exact. Standard VBMT 110304 inserts seat deeply and firmly. No micro-vibrations even during continuous profiling runs."
8. AI-Style Engineering Support Engine (FAQ)
Q1: When should I choose a 107.5-degree approach angle over a standard 93-degree boring bar?
A1: You should choose a 107.5-degree approach angle bar (SVQBR) when your operation requires back-turning, reverse profiling, or internal relief cutting (such as machining internal thread necks or undercuts). The 107.5-degree angle gives the back of the tool body extra clearance so that it doesn't rub against internal step faces when moving out of the bore path.
Q2: What is the absolute minimum bore entry size for this S12M-SVQBR11 tool holder?
A2: The absolute minimum machining bore diameter (φ Dmin) is exactly 16.0mm (0.6299 inches). Attempting to utilize this 12mm tool holder inside a cavity smaller than 16mm will cause the lower steel clearance relief under the pocket seat to grind against the inner wall, generating heat and causing tool failure.
Q3: Can I mount both VBMT 1103 and VCMT 1103 inserts into this boring bar?
A3: Yes. Both VBMT 1103-- and VCMT 1103-- inserts share the identical 35-degree diamond shape, thickness, and hole profile. The primary difference is that VBMT inserts typically feature a 5-degree relief angle while VCMT has a 7-degree relief angle; the pocket geometry of the SVQBR holder safely houses both variations for maximum tooling versatility.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S12M-SVQBR11 internal boring tool holders. For American or mixed imperial lathe turrets, this 12mm metric steel bar operates perfectly within 1/2-inch round split sleeves or reduction blocks, utilizing standard ANSI positive indexable insert designations **VBMT 221 / 222** or **VCMT 221**.
Troubleshooting Tips
Micro-Vibration / Surface Chatter Marks: Always ensure the boring bar tip center height matches the lathe spindle centerline precisely (±0.02mm). Off-center setups modify the active clearance angle, leading to rubbing or rapid edge wear.
Screw seized or stripped: Small M2.5 screws expand under high-speed cutting heat. Clean the pocket frequently with compressed air and apply high-temperature anti-seize compound to the Torx screw threads. Do not over-torque due to the delicate micro-pocket size.
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.