Flat Face Fittings, also known as O-ring Face Seal Fittings or ORFS Fittings, have been proven to be very effective in eliminating leakage at higher pressures found in today’s hydraulic systems.  Our fittings meet or exceed the requirements of SAE J1453 and ISO 8434-3.

Flat Face O-Ring Hydraulic Fittings use high durometer flat rubber O-rings to effect a gasket like soft seal. The O-ring nests in a special groove machined in the face of the fitting body.  When the Flat Face of the sleeve or tube is brought into contact with the face of the fitting and the nut is tightened, the O-ring is compressed and a seal is achieved. Assembly is completed by tightening the nut until a sharp rise in the torque wrench is felt.  But it doesn’t stop here.  System pressure, acting on the already statically compressed o-ring, pushes the O-ring outward and temporarily deforms it, making the joint a pressure sensitive dynamic seal.

Unlike Flareless Fittings which allow only 15 remakes or flared fittings in which nose distortion eventually causes leaks, the soft seal of the o-ring on a Flat Face Fitting allows unlimited remakes as long as some resilience is left in the rubber.  Replacing the O-ring with a new, inexpensive, O-ring makes it a brand new joint.