BEYOND S12M-SDWCL07 Internal Boring Bar 12mm Shank CNC Lathe Turning Tool Holder Left Hand
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ OPERATIONAL NOTICE: The cutting insert is NOT included with this tool holder body. Indexable carbide inserts shown in our product photography are intended strictly for setup reference and visual application mapping.
BEYOND S12M-SDWCL07 Premium Internal Boring Bar & CNC Lathe Tool Holder
1. Product Overview
Engineers Search: "Which rigid 12mm left-hand boring bar cuts smooth internal diameters using compact 55-degree diamond DCMT0702 inserts in tight CNC lathe blocks?"
The BEYOND S12M-SDWCL07 is a high-precision, screw-on internal boring bar engineered for left-hand (L) CNC lathe internal profiling, pocket copying, and demanding semi-finishing routines. Machined from premium tempered alloy steel, the 12mm shank diameter provides high rigidity for micro-pocket configurations, allowing smooth entries into narrow bore openings down to a minimum clearance diameter of 15mm. This tool holder features a specialized 55° pocket geometry that securely seats DCMT 0702-- indexable carbide inserts (such as DCMT 070204 or DCMT 070202), preventing tool deflection on tight internal paths.
When paired with appropriate carbide inserts featuring a positive rake angle and custom-molded chipbreaker troughs, this tool holder achieves exceptional chip control. The insert's geometric chipbreaker splits long, stringy swarf into short, manageable segments, ensuring fluid evacuation out of deep blind holes without packing or binding against the newly turned surface finish.
2. Product Core Features
- Hardened Structural Alloy Steel Shank: Heat-treated to HRC 42-45 to withstand complex deflection stresses in deep internal cavities.
- Ultra-Compact 12mm Shank Design: Engineered to provide reliable clearance paths for small-diameter boring applications down to 15mm minimum bore.
- 93° Dynamic Lead Geometry ($X$): Optimizes chip break paths by rolling swarf forward out of the bore, keeping the freshly machined surface clean.
- Anti-Corrosive Black Oxide Finish: Protects the tool body from abrasive chip rubbing and chemical wear caused by high-pressure cutting fluids.
Model Nomenclature Decoder: S12M-SDWCL07
Steel Shank Body
12mm Shank Dia.
150mm Total Length
Screw Clamping System
55° Diamond Insert Shape
93° Tool Cutting Edge Angle
7° Relief Clearance Angle
Left Hand Orientation
7mm Insert Edge Size
Looking for the Mirrored Right-Hand (R) Companion Unit for Your CNC Setup?
Explore the S12M-SDWCR07 (Right Hand) Tool Holder →3. Technical Specifications & Dimension Comparison
| Technical Variable | Metric Model (S12M-SDWCL07) | Imperial / Inch Conversion Equivalence |
|---|---|---|
| Shank Diameter ($d$) | 12 mm | ~ 0.4724 inches (Closest standard: 1/2" shank class) |
| Overall Length ($L$) | 150 mm | ~ 5.9055 inches |
| Minimum Bore Clearance ($D_{min}$) | 15 mm | ~ 0.5905 inches |
| Matching Insert Index | DCMT 070202 / DCMT 070204 Series | DCMT 21.50.5 / DCMT 21.51 industrial equivalence |
| Fasteners (Included) | M2.0 Pocket Screw + T6 Torx Key | M2.0 Hardened Screw + T6 Structural Wrench |
Optimal Industrial Machining Parameters
| ISO Workpiece Material Group | Cutting Speed ($V_c$) Recommended | Feed Rate per Revolution ($f$) |
|---|---|---|
| Steel Alloys / Low Carbon (P-Class) | 130 - 220 m/min | 0.03 - 0.12 mm/rev |
| Stainless Steel Grades (M-Class) | 80 - 160 m/min | 0.03 - 0.10 mm/rev |
| Cast Iron / Nodular Iron (K-Class) | 90 - 180 m/min | 0.04 - 0.15 mm/rev |
4. Industrial Applications
- Micro-Bore Profile Turning: Perfectly optimized for machining tight inner chambers down to 15mm, where larger 16mm or 20mm tools cannot clear the walls.
- Blind Hole Copying & Profiling: The 93° tool cutting edge angle ensures exceptional clearance paths for complex, step-by-step pocket routines.
- Medium-Depth Boring Operations: The "M" length class (150mm) strikes an ideal balance, offering structural stiffness for mid-depth cavities up to 45mm without risking severe overhang deflection.
5. Equipment & Tooling Compatibility
- CNC Turning Centers: Seamlessly mounts inside standard 12mm round boring block blocks or via split reduction adapter sleeves on CNC tool turrets.
- Conventional Engine Lathes: Highly compatible with standard mini or midi quick-change tool post blocks.
- Global Insert Standardization: Pocket seat is precisely manufactured to ISO tolerances, ensuring an exact fit for 55° positive DCMT 0702-- carbide inserts across all major cutting tool brands.
6. BEYOND Brand Grade Optimization Guide
Match your specific workpiece material with the corresponding BEYOND insert grade to ensure maximum tool longevity and chipbreaker performance:
| BEYOND Insert Grade | Substrate Coating Treatment | Ideal Application Material Focus |
|---|---|---|
| BYM11 (CVD) | Thick Multilayer TiN + Al2O3 Shielding | Engineered for stable, high-speed continuous cuts in carbon steels, pre-hardened alloys, and mold materials. |
| BYS25 (PVD) | Nano-Structured TiAlN Ultra-Hard Finish | High resistance to thermal shock. Built for interrupted cuts, tough scale, and 300/400 series stainless steels. |
| BYK15 (Uncoated) | Mirror-Polished Ultra-Micro Grain Substrate | Designed for high-sfm machining of non-ferrous materials like aluminum alloys, structural brass, and polymers. |
7. Why Choose BEYOND CNC Tools?
BEYOND designs rigid tool holders for automated manufacturing plants globally. By maintaining strict quality controls over insert pocket positioning and utilizing advanced heat-treated alloy steel, our boring tools limit structural chatter, reduce insert wear, and lower production costs.
Global Machinist Feedback
Markus T. — United States
"Finding standard 12mm bars can be tough, but this one fits my sleeve perfectly. I'm boring 16mm holes in 4140 steel with zero chatter at a 35mm depth."
Hans S. — Germany
"Hervorragende Passform. The pocket position is perfectly flat, allowing clean center height calibration. Perfect for small automated machine blocks."
Giovanni M. — Italy
"Il corpo in acciaio è rigido. Good chip clearing room. Excellent performance on finishing passes when using high-fluid pressures."
Kenji O. — Japan
"内径15mmで干渉なく使えます。 The compact 12mm shank structure handles detailed corner radii remarkably well."
Lucas P. — France
"The included M2 screw seats tight and flush. Robust black finish effectively prevents premature abrasive rubbing lines."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the maximum safe boring depth overhang for this 12mm tool body?
A1: For solid steel alloy bodies, the recommended max structural projection limit is **3x to 4x the shank diameter**. For this 12mm bar, your optimal rigid extension target falls between **36mm and 48mm**. Staying within this range prevents harmonic micro-deflections.
Q2: Can I mount larger DCMT 11T3 inserts into this tool holder pocket?
A2: **No.** This pocket is precisely machined to ISO standard tolerances exclusively for the smaller **DCMT 0702--** series inserts (7mm cutting edge length). Attempting to mount a larger insert will compromise or crack the pocket walls.
Q3: What makes an "M" length class bar different from a standard "Q" length class bar?
A3: Length classes follow ISO metrics designation rules. An **"M" class bar indicates a total length of 150mm**, whereas a **"Q" class bar is 180mm long**. The shorter 150mm length increases tool rigidity and dampens structural harmonics on small-diameter applications.
9. Technical Maintenance & Diagnostic Guidelines
Equivalent Industry Models
Interchangeable with global industrial metrics standard coding **S12M-SDWCL07**. Serves as a high-precision drop-in replacement for standard 12mm or ~1/2" tool blocks utilizing 55-degree diamond DCMT pocket layouts.
Troubleshooting Tips
Micro-Chatter at Max Extension: Slightly decrease cutting speed ($V_c$) and increase your feed rate ($f$) to properly load the tool body profile and break chips quickly.
Rapid Pocket Wear: Check that the M2.0 clamping screw is completely clear of micro-debris and torqued to 0.5-0.6 Nm to prevent high force shifting.
Workpiece Material Matrix
Fully optimized across standard groups: **P** (Alloy & Structural Steels), **M** (Stainless Steel alloys), **K** (Grey & Ductile Cast Iron), **N** (Aluminum/Copper Non-ferrous series), and **S** (High-temp superalloys).
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.