Engineered for extreme hardness, this premium 4 flute ball nose end mill delivers unmatched precision in profiling hardened steel and chilled cast iron up to HRC68. Featuring a rigid 4-flute design, our solid carbide 4 flute ball nose end mill doubles machining efficiency and tool life over conventional cutters. Durable Mills provides this industrial-grade ball nose milling cutter for mold and die manufacturers worldwide.
Manufactured by Durable Mills, our industrial-grade 4 flute ball nose end mill is engineered specifically for machining high-hardness steels and chilled cast irons up to HRC68. Utilizing premium ultra-fine micro-grain tungsten carbide substrate (grain size 0.3–0.4 μm, HRA 93.2–94) and an advanced nanocomposite thermal barrier coating, this solid carbide ball end mill delivers double the processing efficiency and service life compared to traditional 2-flute designs.
| Workpiece Material | Hardness | Axial Depth (ap) | Radial Width (ae) | Cutting Speed (Vc) | Feed per Tooth (fz) |
|---|---|---|---|---|---|
| Alloy Steel, Hardened Steel, Chilled Cast Iron | 45–65 HRC (Max HRC68) | 0.05 – 0.10 D | ≤ 0.02 D | 70 – 100 m/min | 0.015 D mm/z |
| Model No. | Radius (R / mm) | Flute Length (Lc / mm) | Shank Dia (d / mm) | Overall Length (L / mm) | Flutes |
|---|---|---|---|---|---|
| DM-R1.5*6*3*50*4T | 1.5 | 6 | 3 | 50 | 4 |
| DM-R1.5*6*3*75*4T | 1.5 | 6 | 3 | 75 | 4 |
| DM-R1.5*6*3*100*4T | 1.5 | 6 | 3 | 100 | 4 |
| DM-R0.5*2*4*50*4T | 0.5 | 2 | 4 | 50 | 4 |
| DM-R0.75*3*4*50*4T | 0.75 | 3 | 4 | 50 | 4 |
| DM-R1*4*4*50*4T | 1.0 | 4 | 4 | 50 | 4 |
| DM-R1.25*5*4*50*4T | 1.25 | 5 | 4 | 50 | 4 |
| DM-R1.5*6*4*50*4T | 1.5 | 6 | 4 | 50 | 4 |
| DM-R1.75*7*4*50*4T | 1.75 | 7 | 4 | 50 | 4 |
| DM-R2*8*4*50*4T | 2.0 | 8 | 4 | 50 | 4 |
| DM-R2*8*4*75*4T | 2.0 | 8 | 4 | 75 | 4 |
| DM-R2*8*4*100*4T | 2.0 | 8 | 4 | 100 | 4 |
| DM-R2.5*10*5*50*4T | 2.5 | 10 | 5 | 50 | 4 |
| DM-R2.5*10*5*75*4T | 2.5 | 10 | 5 | 75 | 4 |
| DM-R2.5*10*5*100*4T | 2.5 | 10 | 5 | 100 | 4 |
| DM-R2.5*10*6*50*4T | 2.5 | 10 | 6 | 50 | 4 |
| DM-R3*12*6*50*4T | 3.0 | 12 | 6 | 50 | 4 |
| DM-R3*12*6*75*4T | 3.0 | 12 | 6 | 75 | 4 |
| DM-R3*12*6*100*4T | 3.0 | 12 | 6 | 100 | 4 |
| DM-R3*12*6*150*4T | 3.0 | 12 | 6 | 150 | 4 |
| DM-R3.5*14*8*60*4T | 3.5 | 14 | 8 | 60 | 4 |
| DM-R4*16*8*60*4T | 4.0 | 16 | 8 | 60 | 4 |
| DM-R4*16*8*75*4T | 4.0 | 16 | 8 | 75 | 4 |
| DM-R4*16*8*100*4T | 4.0 | 16 | 8 | 100 | 4 |
| DM-R4*16*8*150*4T | 4.0 | 16 | 8 | 150 | 4 |
| DM-R4.5*18*10*75*4T | 4.5 | 18 | 10 | 75 | 4 |
| DM-R5*20*10*75*4T | 5.0 | 20 | 10 | 75 | 4 |
| DM-R5*20*10*100*4T | 5.0 | 20 | 10 | 100 | 4 |
| DM-R5*20*10*150*4T | 5.0 | 20 | 10 | 150 | 4 |
| DM-R5.5*22*12*75*4T | 5.5 | 22 | 12 | 75 | 4 |
| DM-R6*24*12*75*4T | 6.0 | 24 | 12 | 75 | 4 |
| DM-R6*24*12*100*4T | 6.0 | 24 | 12 | 100 | 4 |
| DM-R6*24*12*150*4T | 6.0 | 24 | 12 | 150 | 4 |
| DM-R6.5*26*14*100*4T | 6.5 | 26 | 14 | 100 | 4 |
| DM-R7*28*14*80*4T | 7.0 | 28 | 14 | 80 | 4 |
| DM-R7*28*14*100*4T | 7.0 | 28 | 14 | 100 | 4 |
A: A 4 flute ball nose end mill features a substantially stronger core cross-section and doubled cutting edges. This allows significantly higher table feed rates, reduces tool deflection under heavy cutting loads, and delivers a superior surface finish in hardened steel 3D contouring.
A: We recommend an axial depth of cut (ap) of 0.05–0.1D, a radial depth (ae) of ≤ 0.02D, and cutting speeds between 70 and 100 m/min. Air blast or mist cooling is highly advised to avoid thermal shock and premature edge chipping.
A: Yes, Durable Mills provides comprehensive OEM and custom fabrication services. We can customize flute lengths, extended overall lengths, necked shanks, and specialized PVD coatings tailored to your specific workpiece requirements.
A: You can submit your inquiry directly through our contact page or reach out directly to our sales team at info@durablemills.com. We typically provide quotations and technical consultations within 12 business hours.
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