Our high-precision micro ball end mill is specifically engineered for 3D contour copying and profiling on materials up to HRC65. Utilizing 0.4 μm sub-micron tungsten carbide, this 2 flute micro ball end mill delivers maximum tool rigidity and edge sharpness. Durable Mills provides every micro ball end mill cutter with an advanced nano coating for superior thermal protection and extended service life.
Manufactured by Durable Mills, this series of high-precision micro ball end mill tools provides exceptional durability and stability in complex contour milling. Formulated from premium ultra-fine grain solid carbide (grain size: 0.4 μm, cobalt content: 12%, substrate hardness: HRA92.5–93), this cutter is designed for continuous, high-efficiency machining across pre-hardened and quenched steels up to HRC65.
| Model Number | Radius (R / mm) | Flute Length (Lc / mm) | Shank Diameter (d / mm) | Overall Length (L / mm) | Flutes |
|---|---|---|---|---|---|
| DM-R0.1*0.4*4*50 | 0.10 | 0.4 | 4 | 50 | 2 |
| DM-R0.15*0.6*4*50 | 0.15 | 0.6 | 4 | 50 | 2 |
| DM-R0.2*0.8*4*50 | 0.20 | 0.8 | 4 | 50 | 2 |
| DM-R0.25*1*4*50 | 0.25 | 1.0 | 4 | 50 | 2 |
| DM-R0.3*1.2*4*50 | 0.30 | 1.2 | 4 | 50 | 2 |
| DM-R0.35*1.4*4*50 | 0.35 | 1.4 | 4 | 50 | 2 |
| DM-R0.4*1.6*4*50 | 0.40 | 1.6 | 4 | 50 | 2 |
| DM-R0.45*1.8*4*50 | 0.45 | 1.8 | 4 | 50 | 2 |
| Workpiece Material | Axial Depth (ap) | Radial Width (ae) | Cutting Speed (Vc m/min) | Feed per Tooth (fz mm/z) |
|---|---|---|---|---|
| Carbon Steel / Alloy Steel (<35 HRC) | ap ≤ 1.5D | ae ≤ 0.15D | 170 | 0.008D |
| Gray Cast Iron / Ductile Iron (<32 HRC) | ap ≤ 1.5D | ae ≤ 0.15D | 150 | 0.0065D |
| Alloy Steel / Hardened Steel (45–65 HRC) | ap ≤ 0.05D – 0.2D | ae ≤ 0.05D – 0.1D | 120 – 160 | 0.003D – 0.006D |
Micro ball cutters feature miniature radii (R0.1 to R0.45 mm) engineered specifically for tiny internal fillets, precision engraving, electrode fabrication, and intricate optical mold profiling that standard tools cannot reach.
Sub-micron carbide grains paired with 12% cobalt create a denser molecular bond. This structure significantly increases transverse rupture strength, preventing edge chipping when machining tough steels up to 65 HRC.
We recommend high-speed spindles (20,000–40,000 RPM) paired with precision thermal-shrink or hydraulic toolholders to maintain a dynamic runout under 0.003 mm.
Yes. Durable Mills manufactures customized overall lengths, extended necks, and custom coatings for B2B distributors. Reach out directly through our Contact Page or email info@durablemills.com.
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