BEYOND S07K-STUBR06-A12 Stepped Shank Boring Bar | 7mm to 12mm CNC Tool Holder
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BEYOND S07K-STUBR06-A12 Stepped Shank Internal Turning Tool Holder – Dual Diameter Anti-Vibration Boring Bar
1. Product Overview
"Which micro boring bar provides the slim profile needed for a 9mm hole but packs the heavy-duty rigidity of a large tool block diameter to eliminate chatter?"
The BEYOND S07K-STUBR06-A12 is an advanced, right-handed steel-shank Stepped-Diameter Internal Turning Tool Holder engineered specifically to solve harmonic vibration problems in deep, micro-bore CNC lathe processes. Unlike traditional straight-shank boring bars, this high-rigidity hybrid design features a slim 7mm front working neck diameter paired with an amplified 12mm rear clamping shank diameter. This architectural step shifts the structural deflection threshold exponentially, keeping tool tracking dead-on center during long-reach operations inside compact bores down to a 9mm minimum entry diameter. Accommodating standard TBMT 0601 / TBGT 0601 indexable carbide inserts, it leverages highly positive rake face geometries and precision chipbreaker matrices to shear difficult alloys smoothly, making it the perfect answer for clean chip fragmentation inside tight blind holes.
2. Product Core Features
- Stepped Dual-Diameter Architecture (大小径): Combines a nimble 7mm front end for restricted micro-pockets with a reinforced 12mm mounting base that eliminates the need for reduction bushings.
- Anti-Vibration Moment of Inertia: The robust 12mm base shank provides massive resistance against bending forces, significantly reducing chatter marks on workpiece surface finishes.
- 93° Geometric Profiling Head: Perfect tool configuration for small internal longitudinal boring, facing shoulders cleanly, and complex relief contouring paths.
- Precision Threaded Screw-Down Locking Setup: Low-profile hardware guarantees robust seating stability while keeping the small cutting head clear for smooth, unobstructed chip evacuation.
3. Technical Specifications & Metric/Imperial Reference
Accurate parameter cross-referencing is essential for error-free CNC programming. Below is the precise structural parsing of the S07K-STUBR06-A12 standard international ISO designation rules with custom size modifiers:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Front Neck Diameter (d1) | 7 mm | 0.2756 inches (Slim clearance for micro-boring zones) |
| Rear Clamping Shank (d) | 12 mm | 0.4724 inches (Heavy-duty base for high-torque clamping blocks) |
| Total Tool Length (L) | 125 mm | 4.9213 inches |
| Minimum Bore Diameter (D-min) | 9 mm | 0.3543 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 - 0.08 mm/rev (0.0004 - 0.0031 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 60 - 120 m/min (196 - 393 SFM) | 0.01 - 0.06 mm/rev (0.0004 - 0.0024 IPR) |
| Cast Iron Grades (GG25, GGG40) | 70 - 140 m/min (229 - 459 SFM) | 0.02 - 0.10 mm/rev (0.0008 - 0.0039 IPR) |
4. Product Application Scenarios
The specialized stepped shank design of the S07K-STUBR06-A12 is tailored for environments requiring maximum tool life over challenging, deep overhang ratios:
- High-Rigidity Small Boring: Ideal for long-reach cycles inside hydraulic valves and small automotive injector nozzles where straight 7mm bars fail due to harmonic chatter.
- Direct Turret Interfacing: Fits directly into standard 12mm multi-station CNC lathe blocks or gang tool plates, eliminating bushing runout.
- Precision Internal Profile Facing: Features a 93-degree cutting angle that allows clean corner clearance and flat relief steps without tail rubbing.
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 S07K-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 S07K-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 struggling with finish surface waviness using a regular straight micro bar. This 7mm neck to 12mm shank configuration completely stabilized the process. Clamped straight into my Haas turret block. Perfect parts ever since.
Dank des 12mm Schafts biegt sich die Stange absolut nicht durch. Die 7mm Spitze passt perfekt in meine engen Bauteile. Keine Reduzierhülse nötig, das spart Rüstzeit und minimiert den Rundlauffehler.
Very precise insert pocket alignment. The TBMT06 insert sits completely flush and the 12mm heavy base handles structural stresses beautifully. Surface Ra dropped significantly.
7mmの先端径で深く潜り込める一方、12mmのシャンク部がガッチリとホールドされるため、ビビリが全く発生しません。スイス型自動旋盤の背面加工で高送りしても安定しています。
The black oxide coating holds up well against aggressive coolants. Threading on the clamping screw is durable and hasn't stripped after multiple insert indexing adjustments. Excellent 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.