管用テーパねじ用タップ　短ねじ形はどんな時に使う？ | オーエスジー

The short thread type (tap product name: S-TPT) is used for screwing elbows, teas, and other items with a short thread length.

 

Since the reference diameter position is shorter than that of the long thread type, it is possible to secure the reference diameter with a short thread length. It is used when the pilot hole depth is not as long as the long thread type.

 

 

The long thread type (tap product name: TPT) is mainly used for connecting pipe-shaped objects.