High Performance 2 Flute Ball Nose End Mills

Processed Materials	Pre-Hardened Steel 40~50HRC				Hardened Steel 50~60HRC				Hardened Steel 60~68HRC
Ball Head Radius (mm)	Rotational Speed (min-1)	Feed Speed (mm/min)	ap (mm)	ae (mm)	Rotational Speed (min-1)	Feed Speed (mm/min)	ap (mm)	ae (mm)	Rotational Speed (min-1)	Feed Speed (mm/min)	ap (mm)	ae (mm)
R0.5	40000	1900	0.01	0.05	36000	1500	0.01	0.05	32000	1400	0.01	0.05
R1.0	33000	3100	0.02	0.075	26000	2100	0.02	0.075	24000	2000	0.02	0.075
R1.5	29000	4100	0.03	0.1	23000	2900	0.03	0.1	21000	2600	0.03	0.1
R2.0	22000	3900	0.04	0.15	17000	2500	0.04	0.15	15500	2100	0.04	0.15
R2.5	17500	3500	0.05	0.15	13500	2200	0.05	0.15	13000	2000	0.05	0.15
R3.0	15000	3100	0.06	0.2	11500	1700	0.06	0.2	10500	1500	0.06	0.2
R4.0	11000	2500	0.08	0.25	8600	1600	0.08	0.25	8000	1400	0.08	0.25
R5.0	9000	2000	0.1	0.3	7000	1400	0.1	0.3	6000	1200	0.1	0.3
R6.0	7500	1800	0.1	0.35	5700	1300	0.1	0.35	5300	1200	0.1	0.35
R8.0	5500	1800	0.1	0.4	4300	1300	0.1	0.4	4000	1200	0.1	0.4
R10.0	4500	1800	0.1	0.5	3500	1300	0.1	0.5	3200	1200	0.1	0.5
Maximum Cutting Depth

1. Please use high-precision and high rigidity equipment and fixtures.
2. When the rigidity of the machine tool and workpiece installation is poor, vibration and abnormal sound may occur. In this case, the speed and feed rate in the table above should be reduced year-on-year.
3. Please use air cooling or MQL (minimum amount of oil mist cooling).
4. It is recommended to use sequential milling for side milling.
5. Minimize the tool suspension length as much as possible without interference.

The NNH-2B high-performance 2-flute ball nose end mill series is available in a variety of specifications, ranging from 1mm to 20mm in diameter. This flexibility enables users to select the most appropriate tool for their machining requirements, whether for fine engraving or deep cavity milling. Each variant is carefully optimized with its flute length and overall dimensions to ensure precision and efficiency in a variety of applications.

Designed with a ball nose geometry, this end mill provides a smoother transition in 3D surface machining compared to flat nose milling cutters. This shape helps reduce cutting resistance and improve tool stability. The 30° helix angle enhances chip evacuation while minimizing vibration, ensuring stable machining performance. In addition, the 2-flute structure allows for better chip removal in high-speed machining, making it ideal for efficient material removal.

This product uses advanced AlTiSiN coating technology, paired with a substrate with ultra-fine particles (0.4μm). This significantly improves wear and heat resistance, allowing the tool to maintain performance even in high-hardness machining applications. NNH-2B end mills are made of high-hardness carbide and are precision-ground to obtain sharp cutting edges, which can reduce cutting forces and improve machining accuracy.

The NNH-2B series is suitable for a wide range of materials and performs well in high-speed and high-hardness applications. It performs very well in machining hardened steel, tool steel, stainless steel up to 55HRC. In addition, it is also very effective in precision machining of non-ferrous metals such as copper alloys.