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Ductmate Weld Pins are used to permanently secure insulation to the inside of sheet metal ductwork. Designed to work with all the standard resistance welding equipment.
However, NPT threads are tapered and NPS threads are straight (parallel). Both threads have a 60Â° included angle and have flat peaks and valleys. Tapered Pipe Thread is commonly found on ends of pipe, nipples and fittings (i.e. couplings, elbows, tees, etc.). Note: Sharply angled threads are very critical to joint being tight with no leaks. Thread sealant or tape is typically required to complete the seal. Straight Pipe Threads need a gasket or O-ring to create a seal. While NPT and NPS threads will engage, they do not seal properly with each other.