BEYOND S12M-SVJBR11 Internal Turning Tool Holder for VBMT 1103 Inserts
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ PLEASE NOTE: TOOL HOLDER ONLY
The carbide insert shown in the tool holder images is for demonstration purposes only and is NOT included in the purchase. Please order your compatible inserts (VBMT 1103 / VCMT 1103) separately.
BEYOND S12M-SVJBR11 Internal Turning Tool Holder
1. Product Overview
User Query Context: "Which micro-diameter indexable internal boring bar is best for finishing 90-degree square profiles inside a 16mm minimum bore without causing vibration or chip nesting?"
The BEYOND S12M-SVJBR11 is a highly precise, compact steel internal boring bar engineered for demanding profiling and turning applications within narrow bore diameters. Built with an ultra-secure screw-down clamping layout, it perfectly seats standard 35-degree rhombic VBMT 1103 or VCMT 1103 carbide inserts. Its 93° approach angle allows the machinist to turn deep internal square shoulders with maximum structural clearance. By channeling cutting forces axially down the 12mm shank, this tool holder reduces radial deflection and harmonic chatter, creating ample clearance space for flawless chip evacuation in carbon steels, alloys, and stainless steel workpieces.
2. Product Key Features
- Premium Cr-Mo Alloy Steel Construction: Forged using premium-grade chromium-molybdenum alloy steel and quenched to HRC42-45, ensuring exceptional core resilience and anti-deflection properties during deep-hole entry.
- Engineered 93° Lead Angle: Purpose-built for right-hand internal step turning and complex undercut profiling paths, eliminating the risk of tool-body rubbing against fresh workpiece boundaries.
- Low-Profile Screw Clamping Pocket: High-precision pocket design utilizes a top-down alloy insert screw to maintain complete insert stability under intensive cutting friction.
- Vibration-Damping Black Matte Finish: Treated with a specialized anti-corrosive burnished layer that dampens small micro-vibrations, resulting in a significantly smoother surface finish.
3. Technical Specifications & Cutting Parameters
Model Designation Nomenclature Decoder
Steel Shank
12mm Shank
150mm Length
Separator
Screw Clamp
35° Insert Geometry
93° Lead Angle
Normal Clearance
Right-Hand Tool
For VBMT 11..
| Specification Metric | Metric Value | Inch Equivalent System | Inch Value |
|---|---|---|---|
| Model Number | S12M-SVJBR11 | ANSI / Inch Model | A08M-SVJBR3 |
| Shank Diameter (d) | 12 mm | Shank Diameter (Inch) | 0.500" (1/2 inch) |
| Overall Length (L) | 150 mm | Overall Length (Inch) | 5.91" |
| Minimum Bore (D min) | 16 mm | Minimum Bore (Inch) | 0.630" |
| Compatible Insert | VBMT 1103.. / VCMT 1103.. | ANSI Insert Designation | VBMT 33.. |
Recommended Cutting Parameters
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon/Alloy Steel (P) | 100 - 200 m/min | 0.05 - 0.15 mm/rev | 0.1 - 1.0 mm |
| Stainless Steel (M) | 70 - 140 m/min | 0.04 - 0.12 mm/rev | 0.1 - 0.8 mm |
Looking for matching high-performance turning inserts?
🛒 Browse Compatible VBMT 1103 Inserts Collection4. Product Applications
The S12M-SVJBR11 tool holder provides high efficiency across small-scale internal lathe routines:
- Micro-Bore Profile Turning: Ideal for tight internal passages down to 16mm ($D\min$), keeping clearance margins perfectly secure.
- 90-Degree Stepped Cavities: The 93° lead geometry lets you cut sharp interior shoulders cleanly without risking part taper.
- Broad Industry Utility: Perfect for small-diameter pneumatic valve sleeves, instrumentation bushings, hydraulic fittings, and high-precision CNC machine shop configurations.
5. Compatibility Guide
- CNC Turret Interface: Mounts firmly into standard CNC lathe turret blocks, Swiss-type gang blocks, or standard boring bar sleeve reducers tailored for 12mm round shanks.
- Indexable Carbide Standard: Fully compatible with standard indexable VBMT 110302, VBMT 110304, or VCMT 110304 insert profiles from BEYOND or any major international industrial tooling brand.
6. BEYOND Premium Grade Comparison Matrix
Pair your S12M-SVJBR11 holder with the ideal BEYOND insert carbide grade matching your raw stock material requirements:
| BEYOND Carbide Grade | Coating Technology | Primary Application Field | Hardness Range |
|---|---|---|---|
| BY8150 | Nano-PVD TiAlN | Universal General Steel Finishing & Profiling | HRC 20 - 45 |
| BY8200 | Thick CVD TiCN + Al2O3 | Continuous Cutting & Long Tool Life Cycles on Carbon Steels | HRC 25 - 50 |
| BY9030 | Premium PVD AlTiCrN | Stainless Steel Profiles, Duplex, & Superalloys | HRC ≤ 38 |
7. Why Choose BEYOND CNC Tools
BEYOND specializes in manufacturing industrial-grade metal cutting tools that combine close-tolerance dimensional accuracy with exceptional value. Our tooling parts are fully compatible with mainstream ISO parameters, ensuring a seamless drop-in fit into your ongoing operations while helping optimize consumable expenses.
Global Customer Reviews (Verified Tooling Purchases)
"Perfect for Small CNC Lathes"
Fits beautifully into our standard 12mm tool blocks. Holds a very tight center height alignment and inserts sit perfectly flat in the seat pocket.
— Marcus V., United States 🇺🇸"Sehr formstabil und präzise"
Excellent dimensional stability for a standard 12mm steel shank. Swapped out a much more expensive brand bar on our production run, same exact tolerances.
— Dieter S., Germany 🇩🇪"Ottimo per piccoli fori"
Clears micro chips flawlessly in narrow 17mm ports. Hardened alloy steel threads don't strip under load. Fast delivery.
— Lorenzo M., Italy 🇮🇹"仕上げ面が非常に綺麗"
Remarkably low chatter signature on stainless steels. Achieved a highly consistent mirror-like finish inside our internal valve profiles.
— Kenji Y., Japan 🇯🇵Hardware wrench provided is robust. Pocket precision holds standard VBMT 110304 insert points accurately across shifts.
— Neil T., United Kingdom 🇬🇧8. Expert Engineering FAQ
❓ Q1: Why does a 12mm bar like the S12M use an 11-size insert (VBMT 1103) instead of a smaller alternative?
💡 A: Pairing a 12mm shank diameter with a standard VBMT 1103 cutting edge balances tool pocket structural thickness with optimal edge strength, allowing you to execute both fine surface finishing and light roughing cuts within minimal bore clearances down to 16mm.
❓ Q2: What chipbreaker style provides the cleanest chip control inside deep blind holes?
💡 A: For tight internal chambers, a positive ground chipbreaker configured with a narrow land (such as our -HF or -EF series) is highly recommended. It breaks micro-chips into small curls, preventing them from wrapping around the bar shank.
❓ Q3: What is the maximum safe structural overhang extension length for this 12mm shank?
💡 A: For premium alloy steel shanks, the maximum recommended extension limit is up to 3 times the shank diameter ($36\text{ mm}$ overhang from the tool holder clamping edge). Exceeding this length increases radial elasticity and can lead to harmonic chatter signatures.
💡 Technical Maintenance & Troubleshooting Advice
Equivalent Model Cross-Reference: Sandvik Coromant: A12M-SVJBR11 | ISCAR: A12M-SVJBR-11 | Kennametal: A12MSVJBR11D | Walter Tools: A12M-SVJBR11
Troubleshooting Deflection & Chatter: If you experience minor dimensional taper or vibration lines on your internal workpiece walls, try shifting from a 0.4mm corner nose radius down to a sharp 0.2mm configuration (VBMT 110302). This reduces radial tool contact area and lowers pushback forces.
All BEYOND production tool holder bars go through rigorous dimensional inspections before leaving the line. Always clean out the pocket with compressed air before seating a new insert.
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.