BEYOND S12M-SSSCL09 Left Hand Boring Bar | 12mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts
✓ In Stock & Fast Dispatch: Order processing: typically 1–3 business days after confirmation.
✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S12M-SSSCL09 Left Hand Boring Bar – 12mm Rigid Steel Screw Locking CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which left-hand boring bar is best optimized to eliminate harmonic vibration during small internal pocketing and reverse profiling in 16mm+ clearance diameters while using SCMT 09T3 square inserts?"
The BEYOND S12M-SSSCL09 is a highly specialized, industrial-grade Solid Alloy Steel Left Hand Internal Turning Boring Bar engineered for precise counter-clockwise spindle or back-turning operations on CNC lathes. Featuring an engineered 12mm shank diameter and a compact 150mm total length, this tool holder provides exceptional structural resistance against bending deflection in narrow, deep-hole setups. It fills a critical gap for workshops processing small-diameter chambers, offering a stable, anti-vibration tool body that prevents part scrap and holds tight structural tolerances.
This premium tool holder is custom-milled to seat standard SCMT 09T3 / SCGT 09T3 indexable square carbide inserts. The integration of a 75-degree approach angle ensures that radial push-back forces are redirected axially down the tool shank, vastly lowering micro-chatter in restricted diameters. When loaded with micro-grain carbide substrates featuring advanced ground positive-rake chipbreaker geometries, it smoothly shears stubborn metal fibers. The specialized pocket geometry promotes instantaneous chip breaking, turning continuous stringy ribbons into short, tight coils that evacuate seamlessly without packing the narrow bore or scoring precision finishes.
2. Product Core Features
- Specialized 12mm Left-Hand Layout: Engineered specifically for sub-spindle handoffs, reverse-spindle profiling, and back-facing inside tight clearance setups.
- Quenched & Hardened Alloy Steel Shank: High-tensile steel core processed via advanced thermal induction to absorb high-frequency harmonics and prevent deflection under sudden cutting loads.
- 75° Strategic Side Cutting Lead Angle: Balances mechanical forces between axial and radial directions, allowing stable shoulder squareness and smooth internal profiling transitions.
- Low-Profile Screw Clamping Mechanism: Uses a high-tensile M3 Torx screw system that completely eliminates bulky top clamps, leaving the maximum cross-sectional space open for clear chip flow.
3. Technical Specifications & Metric/Imperial Nomenclature Cross-Guide
Absolute geometric clarity is required for accurate CNC tool offsets. Below is the precise international ISO classification breakdown for the S12M-SSSCL09 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 12 mm | 0.4724 inches (Fits standard metric blocks or imperial holders via sleeves) |
| Total Tool Length (L) | 150 mm | 5.9055 inches (Compact format optimized for rigidity in shallow holes) |
| Minimum Bore Diameter (D-min) | 16 mm | 0.6299 inches (Excellent for tight, micro-internal cavities) |
| Compatible Carbide Insert Layout | SCMT 09T3xx / SCGT 09T3xx | SCMT 3(2.5)1 / SCMT 3(2.5)2 (3/8" IC Square Size) |
| Clamping Screw Model Type | M3.0 x 7.0 / 8.0 | M3.0 x 0.2756 inches |
| Torx Key Driver Wrench Size | T9 / T10 | T9 / T10 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) | 100 - 180 m/min (328 - 590 SFM) | 0.05 - 0.20 mm/rev (0.0020 - 0.0078 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 60 - 120 m/min (196 - 393 SFM) | 0.04 - 0.15 mm/rev (0.0015 - 0.0059 IPR) |
| Cast Iron Grades (GG25, GGG40) | 80 - 140 m/min (262 - 459 SFM) | 0.06 - 0.22 mm/rev (0.0024 - 0.0086 IPR) |
4. Product Application Scenarios
The highly compact 12mm tool diameter makes the S12M-SSSCL09 highly effective for precise internal profiles across complex manufacturing setups:
- Precision Internal Step Turning: Ideal for machining small step-bores, inner lips, and precise relief tracks inside miniature valve sleeves.
- Sub-Spindle Back Boring: Perfect for completing reverse-spindle internal tracks on multi-axis turning centers to avoid manual part flipping.
- Small Machined Bushings & Hubs: Widely applied in medical devices, automotive sensors, and pneumatic component lines where the inner diameter sits strictly between 16mm and 22mm.
5. Compatibility & Equipment Interface
The ground 12mm cylindrical shank fits perfectly into standard metric CNC lathe turrets, static VDI blocks, and precise split-sleeve tool blocks. When loaded into larger metric or imperial CNC configurations, it easily aligns via standard multi-size reduction bushes. It works seamlessly across premium CNC equipment brands including Haas, Mazak, DN Solutions/Doosan, Citizen, Star, and specialized live-tooling lathes configured for precise reverse-spindle machining cycles.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S12M-SSSCL09 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Structured with micro-hard TiAlN coatings. Optimized to stop built-up edges (BUE) on sticky materials like 304 stainless steel and high-temp titanium alloys.
- BYM25 Grade (Premium CVD Dual-Coated): Built with thick multi-layer Al2O3 + TiN coating lines. The benchmark standard for continuous, high-speed internal roughing passes on carbon structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. Custom-engineered for high-speed internal profiling of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
At BEYOND, structural integrity is our baseline. The S12M-SSSCL09 undergoes rigorous multi-axis automated induction hardening and automated pocket milling. By locking insert seat tolerances down within a strict ±0.01mm limit, we eliminate micro-movements under heavy impact. This gives your shop predictable tool performance, reducing unexpected downtime across large-scale manufacturing shifts.
Global Machinist Field Reports:
Hard to find high-quality 12mm boring bars, especially left-handed. BEYOND nailed this tool. The steel is exceptionally stiff for its size, and clamping SCMT 09T3 inserts is dead-accurate. Vibration completely disappeared on my carbon steel tubes.
Die 12mm-Ausführung ist perfekt für unsere engen Bauteile. Sehr robuster Plattensitz. Guter Späneabfluss, da der Schraubkopf extrem flach gehalten ist. Absolut empfehlenswert für CNC-Drehmaschinen.
Great bar for tight counter-boring. Used on a sub-spindle setup and the dimensions are holding rock steady within 0.01mm across long batches. Fast shipping to Europe.
内径16mm超の狭いボス加工に導入しました。鋼シャンクですが150mmと絶妙な長さで、チャタリングが全く発生しません。SCMTチップのクランプが極めて安定しています。
The screw clamping gives perfect open clearance. When combined with steady flood lines, chips lift right out of the 17mm entry holes without binding.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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.