Rolled Pipe Fittings
Swagelok has used the thread rolling process for many years to form male fitting threads, both pipe and tube fittings. This process creates threads with a higher shear strength and resistance to galling as compared to cut threads.
Swagelok NPT threads are manufactured to create a leak-tight connection while optimizing the number of threads engaged.
Our design follows the ANSI/ASME B1.20.1 thread standard. We comply, but improve upon this requirement through permissible design conformance by controlling thread truncation to limit root-to-crest interference. This results in a trusted thread rolling process for forming male fitting threads that creates threads with a higher shear strength and resistance to galling compared to cut threads.
Tapered pipe threads work by “interference fit." The tolerances for angles, lengths, heights, etc., can’t be held closely enough to make a seal. Male pipe threads can’t be manufactured to tolerances which will seal on a taper with female pipe threads without a sealant. A good thread sealant is essential. Sealants, such as Swagelok TFE tape or Swak, will fill the voids between the threads and will act as an anti-galling lubricant between the threaded surfaces.
All Swagelok products are backed by our Limited Lifetime Warranty.