R4 (8mm) Steel Chamfer End Mill carbide end milll
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BEYOND R4 (8mm) Steel Chamfer End Mill – Arc Type Up & Down Chamfer Cutter
The BEYOND R4 (8mm) Steel Chamfer End Mill is a high-performance cutting tool designed for precise edge rounding and chamfering on steel components. The unique arc-type up & down blade geometry allows both top and bottom chamfering in a single pass, improving productivity and achieving a fine surface finish.
Key Features
- Cutting Diameter (d1): 8mm
- Chamfer Radius (R): R4
- Shank Diameter (d2): 8mm
- Overall Length (L): 60mm
- Material: Ultra-fine tungsten carbide for durability and precision.
- Design: Arc-shaped up & down edges for dual-side chamfering.
- Coating: AlTiN/TiAlN for heat and oxidation resistance.
- Applications: Carbon steel, alloy steel, die steel, pre-hardened steel.
- Tool Type: CNC chamfering, edge-finishing, and deburring tool.
Technical Specifications
| Model | Radius (R) | Cutting Diameter (d1) | Shank Diameter (d2) | Overall Length (L) | Material |
|---|---|---|---|---|---|
| R4-8MM | R4 | 8mm | 8mm | 60mm | Tungsten Carbide |
Advantages
- Performs simultaneous top and bottom chamfering for efficient processing.
- Arc geometry ensures smooth and burr-free edge transitions.
- High precision cutting suitable for steel and hard materials.
- Stable performance at high-speed CNC operations.
- Extended tool life due to premium carbide and advanced coating.
Recommended Cutting Parameters
- Cutting Speed (Vc): 100–160 m/min
- Feed per Tooth (fz): 0.02–0.05 mm/tooth
- Depth of Cut (ap): 0.4–1.2 mm
Applications
The R4 (8mm) Steel Chamfer End Mill is widely used for chamfering, rounding, and deburring of steel parts in mold making, die finishing, and precision mechanical component production. Its dual-side cutting function reduces tool changes and enhances efficiency for mass production.
Why Choose BEYOND?
BEYOND delivers precision CNC cutting tools engineered for accuracy and durability. Each chamfer cutter is made from premium carbide with strict quality control, ensuring excellent results in demanding metalworking environments.
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.