Question 502General Subjects - Assistant Engineer

The correct answer is A) taper tap. When internal threading for piping where the work permits the tap to be run entirely through, a taper tap should be used. Taper taps have a gradual taper at the start of the threads, which allows the tap to be easily started and threaded all the way through the hole. This is the recommended choice when the full depth of the hole can be accessed, as the taper tap can cut the threads from start to finish without any issues. The other options are not correct in this scenario. A finishing tap has a shorter taper and is typically used to refine the threads after initial threading, while a plug tap and a bottoming tap are designed for situations where the full depth of the hole cannot be accessed, requiring a more abrupt taper.