Two-edge end mills are usually used for rough machining and grooving of non-ferrous metals and low-carbon steel. Large helix angle and large chip flutes make cutting brisk and smooth chip removal. Two-edge end mills have a large helix angle, generally over 30 degrees. The keyway milling cutter is also two-edged, mainly the face edge is involved in the cutting, which can directly cut down the keyway milling cutter with a small helix angle (20 degrees), groove depth, approximate straight line folding back, and a bit similar to a twist drill.

The main difference between a two-edged end mill and a keyway milling cutter is that the end face of the two-edged end mill has a center hole, while the end face of the keyway milling cutter has no center hole. Therefore, the end mill cannot directly feed the tool downwards, and the center hole will withstand it if it goes deep downwards. The keyway milling cutter can feed directly downwards. In addition, the keyway milling cutter, as the name suggests, is used for milling the keyway, so the dimensional accuracy of its outer diameter is very high, generally reaching an accuracy of about 0.01mm. However, two-edged end mills are more suitable for plane machining. The two-edged end mills of the German KHC brand have high hardness and strong cutting force, which can increase the speed and feed rate, increase productivity, make the knife inconspicuous, and can process stainless steel and titanium. Slotting of difficult-to-machine materials such as alloys has a high customer satisfaction rate.