4 Flute Flat Head End Mills

Processed Materials	Cast Iron Nodular Cast Iron		Carbon Steel, Alloy Steel ~750N/mm²		Carbon Steel, Alloy Steel ~30HRC		Pre-Hardened Steel, Quenched and Tempered Steel ~40HRC		Stainless Steel		Pre-Hardened Steel, Quenched and Tempered Steel ~50HRC
Diameter (mm)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)
1	20000	250	20000	250	20000	200	20000	200	20000	90	20000	150
2	15000	400	15000	400	15000	360	15000	350	11150	100	13000	225
3	14000	680	14000	680	13000	630	10600	525	7500	120	8500	410
4	10800	700	10800	700	10000	640	8000	535	5500	125	6500	420
5	8200	730	8200	730	7600	670	6400	560	4500	125	5000	440
6	7000	750	7000	750	6400	690	5300	575	3700	135	4200	450
8	5200	740	5200	740	4800	680	4000	565	2800	135	3200	460
10	4200	730	4200	730	3800	670	3200	560	2200	135	2500	435
12	3500	730	3500	730	3200	670	2650	560	1850	135	2100	435
14	3000	680	3000	680	2700	630	2300	525	1600	125	1800	410
16	2600	680	2600	680	2400	630	2000	525	1400	120	1600	410
18	2300	670	2300	670	2100	620	1800	515	1250	105	1400	405
20	2050	670	2050	670	1900	620	1600	515	1100	105	1250	405
Maximum Cutting Depth
									Tool Diameter	Cutting Depth ap
									∅1<D<∅3	0.15D
									∅3<D	0.3D

The above table shows the standard values for side milling machining. When cutting grooves with the tool, the speed should be 50%~70% of the above table, and the feed rate should be 40%~60% as the standard value.
2. Please use high-precision machine tools and tool holders.
3. Please use air cooling or cutting fluid that is less likely to produce smoke.
4. It is recommended to use sequential milling for side milling.
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.
6. Minimize the tool overhang length as much as possible without interference.

The NNC-4T 4 Flute Flat Head End Mills has a variety of diameters from 1 mm to 20 mm, and can be matched with different blade lengths and total lengths, helping processors to flexibly use it in different scenarios such as narrow spaces or large cutting surfaces. By combining different size solutions, a good balance can be achieved between processing efficiency and surface finish, suitable for diverse production needs.

It adopts a four flute flat head design with a 35° helix angle. The tool rake angle and back angle are carefully optimized to effectively reduce cutting resistance. It has a wider range of general performance, uniform cutting edge distribution, and can maintain lower vibration and smoother chip removal during cutting, while still ensuring stable cutting performance during high-speed processing.

In terms of manufacturing, NNC-4T flute flat head end mills uses high-precision CNC grinding technology to ensure sharp edges and strictly controlled dimensional tolerances. The surface coating uses the latest chromium-aluminum composite coating, which has excellent high-temperature hardness and oxidation stability, thereby extending the tool life and improving the quality of the processed surface.

This milling cutter is suitable for processing a variety of materials such as carbon steel, alloy steel, mold steel, stainless steel and cast iron, especially for workpieces with a hardness not exceeding 45HRC.