S20R-STUNR16 Internal Boring Bar High-Quality Alloy Steel, Compatible with TNMG Inserts, for CNC Machines
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S20R-STUNR16 CNC Boring Bar Tool Holder | Internal Turning Tools
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Overview
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Specifications
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Applications
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Advantages
The S20R-STUNR16 CNC boring bar tool holder is designed for high-precision internal turning operations. Featuring a 93° cutting edge angle and zero-degree blade relief, it ensures exceptional performance on CNC machine tools and lathes.
Detail Page:
- Material: Alloy Steel
- Type: S20R-STUNR16
- Diameter of Handle: 20mm
- Total Length: 200mm
- Length of Cutting Blade: 16mm
- Screw: M3.5*13T
- Wrench: T15
- Compatible Blades (Inserts):TNMG160404, TNMG160408, TNMG160412, TNMG160416 TNMG331, TNMG332, TNMG333
Application:
This tool holder is primarily used in CNC machine tools and CNC lathes for internal turning applications. It accommodates a range of carbide inserts, providing versatility in machining operations.
Advantages:
- Precise internal turning with a 93° cutting edge angle.
- Durable alloy steel construction ensures longevity.
- Zero-degree blade relief for optimal cutting performance.
- Compatible with multiple carbide inserts for versatility.
- Designed for efficiency and accuracy in CNC machining.
5-Point Description:
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Precision Machining: Provides a 93° cutting edge angle for accurate internal turning operations, ensuring high precision and surface finish.
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Durable Construction: Made from alloy steel for strength and durability, suitable for long-term use in CNC machining environments.
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Efficient Design: Features a 20mm diameter handle and a total length of 200mm, optimized for stability and performance during machining.
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Versatile Compatibility: Compatible with TNMG carbide inserts, including TNMG160404 to TNMG333, making it versatile for machining various materials.
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Application: Ideal for CNC machine tools and lathes, perfect for use in boring bar setups and internal turning applications.
Package Includes:
- S20R-STUNR16 Tool Holder
- Compatible Screws, and Wrenches
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.