The male-male threading with external coupling is a connection with a square thread with four threads per inch (the capacity can vary at the customer’s request) with a minimum length of 50 mm and a maximum length of 150 mm. The minimum length of the external coupling is 120 mm and the maximum is 250 mm. We are able to thread pipes up to a length of 6.5 metres. The minimum diameter that can be threaded is 60.3 mm and the maximum is 219 mm.