Dielectric Fittings

Superlok Tube Fittings are the industry leader in dual ferrule compression fittings.  Their Ra32 internal polish is the industry best ensuring that you will always get a leak tight fit.  Superlok has a lifetime warranty. They are 100% intermixeable and interchangeable with all other brands of compression fittings including but not limited to:

  • Swagelok
  • Parker
  • SSP
  • Tylok 
  • Bi-Lok
  • DK-Lot
  • Fit-ok
  • Ham-Let
  • Hi-Lok

Dual Ferrule Compression Fittings are made of 316SS, with a short and long ferrule they are designed to crimp onto the stainless steel or carbon steel tube/pipe and withstand pressure of up to 10,000psi. 


The Superlok® Dielectric Fittings are designed to insulate subsystems from electrical current, voltages and static charges. Installed on impulse lines ahead of monitoring stations in natural gas pipelines, the fittings interrupt cathodic current flow while permitting full fluid flow.

Metal components are machined from 316 stainless steel for use in rugged environments.  Thermoplastic insulation with excellent electrical, chemical and ultraviolet resistance. Low water absorption maintains dielectric strength and integrity over a wide range of operating and climatic conditions.  Gaugeable SUPERLOK® Tube Fitting or tapered pipe thread end connections provide direct connection to tubing or piping system.


  • Materials: 316 Stainless Steel
  • Insulator: PEEK
  • O-Ring Material: 70 Durometer VITON
  • Back-Up Washer: Virgin PTFE
  • Pressure Rating: 5000 PSIG
  • Temperature Rating: -40°F – 200°F

Dielectric Fittings Downloads