DIE NUT, 1/2″ NPT, HSS

Goliath solid High Speed Steel (HSS) Dienuts are used for cutting of new threads as well as extending/cleaning/resizing of existing threads where a button die is not suited due to work space restrictions and/or on site thread accessability.

HSS Dienuts have a vastly longer tool life than Carbon dies as well as producing more accurate threads.

NPT (NATIONAL PIPE TAPERED)

NPT is a US standard for tapered threads used to join pipes and fittings. ANSI/ASME standard B1.20.1 covers threads of 60° form with flat crests and roots. The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other. However a clearance remains between the crests and roots of the threads, resulting in a leakage around this spiral. This means that NPT fittings must be made leak free with the aid of thread seal tape or a thread sealant compound. For each 12″ increase in distance from the end, the diameter increases by 3/4″.