BEYOND S05K-STUBR06-A12 Stepped Shank Boring Bar | 5mm to 12mm CNC Tool Holder
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BEYOND S05K-STUBR06-A12 Stepped Shank Internal Turning Tool Holder – Dual Diameter Anti-Vibration Boring Bar
1. Product Overview
"Which extreme micro boring bar allows precise profiling down to a 7mm minimum bore entry while providing a heavy-duty 12mm shank to fully eliminate deflection chatter?"
The BEYOND S05K-STUBR06-A12 is an industrial-grade, right-handed steel-shank Stepped-Diameter (大小径) Internal Turning Tool Holder engineered specifically to solve high structural deflection and tool tip resonance challenges in ultra-small internal diameter CNC lathe operations. Unlike basic straight micro boring bars that easily flex under minimal load, this high-rigidity hybrid design pairs an ultra-slim 5mm front neck working diameter with a robust 12mm rear clamping shank base. This architectural step dynamically boosts the tool's moment of inertia at its mount, keeping tool tracking dead-on center during deep operations inside tight cavities down to a 7mm minimum entry diameter.
This premium tool holder accommodates standard TBMT 0601 / TBGT 0601 indexable inserts. When combined with advanced micro-grain carbide substrates featuring ground-in positive rake geometries, it forces continuous stringy chips to segment into tight, manageable curls. This optimized chip formation prevents bird-nesting on the small tool head, guaranteeing smooth evacuation paths and preventing surface scratching when turning carbon steels, sticky alloys, and stainless steels.
2. Product Core Features
- Stepped Dual-Diameter Architecture (大小径): Features an ultra-narrow 5mm front neck for extreme sub-compact pocket entry alongside a reinforced 12mm mounting base that clamps directly into tool turrets without thin bushing sleeves.
- Anti-Vibration Moment of Inertia: The heavy 12mm rear section absorbs mechanical vibration frequencies smoothly, preventing 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 intricate relief profiling without heel dragging.
- Low-Profile Screw-Down Clamping: Uses an inset Torx screw setup to maintain a streamlined profile head, maximizing the available space for safe chip evacuation in narrow internal bores.
3. Technical Specifications & Metric/Imperial Reference
Accurate parameter verification is vital for flawless CNC code execution. Below is the structural decoding of the S05K-STUBR06-A12 standard international ISO designation rules with custom stepped-size modifiers:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Front Neck Diameter (d1) | 5 mm | 0.1968 inches (Engineered for extreme ultra-small micro-boring) |
| Rear Clamping Shank (d) | 12 mm | 0.4724 inches (Fits directly into standard 12mm turret blocks) |
| Total Tool Length (L) | 125 mm | 4.9213 inches |
| Minimum Bore Diameter (D-min) | 7 mm | 0.2756 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 - 0.06 mm/rev (0.0004 - 0.0024 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 60 - 120 m/min (196 - 393 SFM) | 0.01 - 0.04 mm/rev (0.0004 - 0.0016 IPR) |
| Cast Iron Grades (GG25, GGG40) | 70 - 140 m/min (229 - 459 SFM) | 0.02 - 0.08 mm/rev (0.0008 - 0.0031 IPR) |
4. Product Application Scenarios
The specialized stepped shank layout of the S05K-STUBR06-A12 excels in CNC environments requiring structural rigidity over narrow, deep overhang ratios:
- Precision Instruments & Aerospace Elements: Tailored for cutting miniature valve parts, micro-fittings, and aerospace sensing housings with extreme wall precision.
- Direct Swiss-Turn Lathe Configurations: Slides straight into standard 12mm slide plates or sub-spindle tool posts on Swiss-style automatics without a loose reducer sleeve.
- Small-Bore Shoulder Turning: The 93-degree cutting angle profiles clean 90° inner flat lips cleanly, ensuring smooth corner relief without clearance rub.
5. Compatibility & Equipment Interface
The precision-ground 12mm rear clamping base mounts directly into CNC lathe blocks, gang tooling rows, and quick-change toolposts. It functions flawlessly across international machine builder systems such as Haas, Mazak, Doosan/DN Solutions, Citizen, Star, Tsugami, and specialized live-tooling Swiss arrays configured for 12mm tool shank baselines. Optimized for right-hand operation.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S05K-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 S05K-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 getting terrible chatter using standard 5mm straight bars inside small hydraulic blocks. This 5mm front to 12mm rear stepped bar completely eliminated the vibration. Parts come out with a perfect finish now.
Der 12mm Schaft passt ohne Reduzierhülse direkt in die Werkzeugplatte. Dadurch hat man absolut keinen Rundlauffehler. Der 5mm Hals dringt mühelos in sehr kleine Bohrungen ein.
The pocket geometry is cut perfectly. The TBMT insert sits absolutely flat. Roughness values on our internal stainless parts dropped instantly. Very strong base shank.
先端が5mmなので7.5mmの内径切削が非常にスムーズです。根元が12mmと太いため工具剛性が圧倒的で、超硬ボーリングバイトに近い安定感があります。コストパフォーマンス最高です。
The black oxide coating holds up against sulfurized cutting oils perfectly. Threads are solid and don't deform after continuous insert indexing. Highly recommended for any small precision shop.
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.