厚鋼電線管ねじ　＜ねじ規格＞ ctg　～あつこうでんせんかんねじ～ 　 | オーエスジー

As a symbol for the thread, it is represented as "CTG".
* Please note that there is also a standard called "CTC" thin steel conduit screw, which is easy to make a mistake.

Taps for PF and PS cannot be used to process CTG threads.
There are no standard stock products for both taps and gauges, and special products are supported.
If you are dealing with special items, please contact OSG through the trading company you usually do business with.