BEYOND S12M-SVJBR11 Internal Turning Tool Holder for VBMT 1103 Inserts
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
⚠️ 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.
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.