FC-HT recommended to mass production in Cast Iron

【英】困ったときの知恵袋詳細

Cutting Taps Metric Threads Trouble Shooting

We have tapped a small amount of FC 250 cast iron material in the past. Now we have received a much larger order for tapping the same size thread in the same material. The M8 × 1.25 thread has a length of 15mm. Currently, we are tapping with a HT P3 M8X1.25 tap in these castings. The GP-6H GO gauge is wearing early into a NG condition and the frequency of tap changes is increasing and causing a problem. Can you recommend a better tap for this material and job?

The cast iron FC casting material contains a lot of carbon, so the tap is more prone to wear at an early stage. To perform tapping in mass production in cast iron parts, Yamawa recommends you use a FC-HT hand tap that is designed specifically for cast iron. The FC-HT tap was developed for improving the tool life by utilizing the optimum cutting edge shape. The FC-HT taps have a unique surface treatment for cast iron material.
For details, please refer to the explanation on the attached PDF file for details.

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