FR Series Face Seal Fittings


  • Metal-to-metal seal to provide perfect leak-tight service for working conditions from critical vacuum to high pressure
  • Precision manufactured gasket to ensure best performance
  • Test port at nut for easy leak testing
  • Silver-plated female threads
  • Standard surface roughness finished to an average of Ra 10 μin. (0.25μm) or electropolished to Ra 5 μin. (0.13 μm) optional
  • All seal faces and male threads protected with plastic caps
  • Every gland and body marked with size, material and heat code

Technical Data

  • Sizes range from 1/16″ to 1″ and 6 mm to 18 mm
  • Thread Specifications
Thread TypeSpecifcation
NPTASME B1.20.1,SAE AS71051
Unified ASME B1.1, SAE J475

Working Pressure:

  • Working pressures shown in the catalogue are calculated according to ASME B31.1 at ambient temperature.

Working Temperature:

ComponentMaterialMax Temperature
Fittings316 SS
316L SS
1000°F (538°C)
Gaskets316L SS
1000°F (538°C)
400°F (204°C)
600°F (316°C)

Installation Instructions

  1. Assemble the gland, nut, gasket and male nut as below. Finger tight the nut.
  2. For fittings the 316L SS and Nickel gaskets, tighten the nut 1/8 turn with a wrench while holding the male nut or the fitting body steady. Tighten the nut 1/4 turn for those with copper gaskets.


  • Dimensions are for reference only and are subject to change.
  • Over-tightening will damage the sealing beads and lead to possible leak.
  • Utilise a new gasket for each assembly.
  • Tungsten Inert Gas Welding (TIG) is recommended
  • Always apply proper thread sealants on tapered pipe threads.
  • Do not loosen or tighten fittings when system is pressurised.