Tapping Hard Material of 50 HRC

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Cutting Taps Trouble Shooting

We are producing internal threads on plastic injection molds in sizes from M3 to M12 by using YAMAWA carbide taps N-CT FC with a 3P chamfer. The work piece material is SKD 61 pre-hardened steel with a hardness of 50 HRC. Do you have any other type of carbide taps you would recommend for this material? We are using machining centers with synchronous feed system to tap.

The carbide hand taps you are currently using are for cast iron. In the past, we only had 2 types of carbide hand taps, N-CT LA for light alloys and N-CT FC for cast iron. At that time, the best choice was our N-CT FC taps. Recently, we added some new lineups of carbide taps for different applications. The best choice in carbide hand taps for high hardness steels is our EH-HT which is shown in the picture below.

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