BEYOND S06K-STUBR06-A12 Stepped Shank Boring Bar | 6mm to 12mm CNC Tool Holder
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BEYOND S06K-STUBR06-A12 Stepped Shank Internal Turning Tool Holder – Dual Diameter Anti-Vibration Boring Bar
1. Product Overview
"Which ultra-small boring bar allows profiling down to an 8mm minimum bore while maintaining a heavy-duty 12mm shank to prevent lathe chatter?"
The BEYOND S06K-STUBR06-A12 is a professional-grade, right-handed steel-shank Stepped-Diameter (大小径) Internal Turning Tool Holder engineered specifically to solve structural flex and harmonic resonance issues during ultra-small internal diameter lathe operations. Unlike basic straight-shank tools, this hybrid design features an ultra-slim 6mm front neck working diameter stepped up to a robust 12mm rear clamping shank base. This engineering breakthrough shifts the deflection threshold exponentially, keeping the cutting point locked on center inside narrow cavities down to an **8mm minimum entry diameter**.
This industrial tool holder accommodates standard TBMT 0601 / TBGT 0601 indexable inserts. When paired with advanced PVD/CVD micro-grain carbide substrates featuring ground-in positive rake chipbreaker geometries, it forces continuous stringy chips to segment into compact, manageable curls. This prevents bird-nesting on the tool head, making it an excellent match for small-bore profiling in carbon steel, alloy matrices, and gummy stainless steel workpieces.
2. Product Core Features
- Stepped Dual-Diameter Architecture (大小径): Built with a nimble 6mm front neck for deep micro-pocket access and a reinforced 12mm mounting base that fits directly into tool blocks without a reducing sleeve.
- Anti-Vibration Moment of Inertia: The heavy 12mm rear shank handles twisting forces smoothly, dampening micro-chatter to deliver clean, mirror-like workpiece surface finishes.
- 93° Geometric Profiling Head: Optimized for small internal longitudinal boring, precise 90-degree internal face steps, and back-boring paths without heel rubbing.
- Low-Profile Screw-Down Clamping: The micro-head uses an inset Torx screw configuration to maximize available chip evacuation paths in restricted internal spaces.
3. Technical Specifications & Metric/Imperial Reference
Accurate parameter verification is essential for precise CNC programming. Below is the structural decoding of the S06K-STUBR06-A12 standard international ISO designation rules with custom stepped-size modifiers:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Front Neck Diameter (d1) | 6 mm | 0.2362 inches (Engineered for ultra-small core access) |
| Rear Clamping Shank (d) | 12 mm | 0.4724 inches (Fits directly into 12mm tool stations) |
| Total Tool Length (L) | 125 mm | 4.9213 inches |
| Minimum Bore Diameter (D-min) | 8 mm | 0.3150 inches |
| Compatible Carbide Insert Layout | TBMT 0601xx / TBGT 0601xx | TBMT 1.2(1.2)1 / TBMT 1.2(1.2)2 |
| Clamping Screw Model Type | M2.0 x 4.3 | M2.0 x 0.17 inches |
| Torx Key Driver Wrench Size | T6 | T6 Torx Wrench |
Recommended Technical Machining Parameters (Speed & Feed Guide)
| Workpiece Material Classification | Cutting Speed (Vc) Range | Feed Rate (f) Per Revolution |
|---|---|---|
| Carbon Steel / Alloy Steel (HB180-280) | 110 - 190 m/min (360 - 623 SFM) | 0.01 - 0.07 mm/rev (0.0004 - 0.0027 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 60 - 120 m/min (196 - 393 SFM) | 0.01 - 0.05 mm/rev (0.0004 - 0.0020 IPR) |
| Cast Iron Grades (GG25, GGG40) | 70 - 140 m/min (229 - 459 SFM) | 0.02 - 0.09 mm/rev (0.0008 - 0.0035 IPR) |
4. Product Application Scenarios
The specialized stepped shank design of the S06K-STUBR06-A12 is tailored for CNC environments requiring maximum tool life over challenging, deep overhang ratios:
- Precision Medical Component Manufacturing: Ideal for machining internal cavities of small valve blocks, orthopedic bone screws, and high-tolerance fluid fittings.
- Direct Swiss-Type Lathe Interfacing: Mounts straight into standard 12mm gang plates or live tool blocks on Swiss machines without requiring an extra bushing.
- Internal Face Relief Sweeps: The 93-degree relief head angle paths clean flat 90° shoulder profiles inside tiny step bores without trailing edge friction.
5. Compatibility & Equipment Interface
The 12mm rear clamping base mounts seamlessly into CNC lathe block fixtures, gang tool posts, and automated quick-change turrets. It matches perfectly with global machinery platforms including Haas, Mazak, Doosan/DN Solutions, Mori Seiki, Okuma, and specialized live-tool Swiss-turn setups configured for 12mm tool holder systems. Engineered exclusively for right-hand operations.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S06K-STUBR06-A12 stepped boring bar with the correct BEYOND insert grade to maximize tool life and secure optimal chip control:
- BYM11 Grade (PVD Coated Substrate): Built with an advanced nano-layered TiAlN matrix. Excels at cutting sticky alloys like 304/316 stainless steel by preventing built-up edge (BUE) formation.
- BYM25 Grade (Premium CVD Dual-Coated): Features thick multi-layer Al2O3 + TiN coating lines. Highly optimized for stable, high-velocity continuous roughing cycles on carbon and structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. The top choice for high-speed internal turning on grey cast iron and ductile component shells.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we solve real-world machining challenges. The S06K-STUBR06-A12 bridges the gap between small tool requirements and large machine turret sizes. By controlling our pocket alignment tolerances to a strict ±0.01mm using elite CMM evaluation systems, we ensure your insert stays perfectly on center, providing ultra-predictable performance across long batches.
Global Machinist Field Reports:
Was having severe finish issues using a basic straight 6mm micro-bar over a 20mm depth. This stepped tool holder completely stabilized the tool tip. Clamps beautifully right into our gang tool plate. Zero vibration marks.
Die Maße stimmen exakt. Durch den 12mm Schaft spart man sich das Gefummele mit Reduzierhülsen, was den Rundlauffehler eliminiert. Die 6mm Spitze passt perfekt in unsere engen Bauteile.
Very clean pocket finish. The tiny TBMT06 insert seats squarely. Surface roughness decreased significantly when turning internal channels in 316L stainless parts.
先端が6mmと細いので、8.5mmの内径加工も余裕でクリアできます。シャンクが12mmあるため剛性が非常に高く、サイクルタイム短縮のために送りを上げても刃先が逃げません。
The black oxide layer handles water-soluble coolants perfectly without showing oxidation signs. Clamping screws hold up to high indexing cycles without stripping threads. Excellent shop value.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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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.