O-Ring Face Seal

Assembly Instructions

  1. Lubricate the threads and the entire surface of the face seal o-ring
  2. Install o-ring into face seal groove.
  3. Place matting face seal flange against o-ring and finger tighten face seal flange nut.
  4. Torque flange nut to the value in the following table.

Dash Size
Flared Thread Size
Torque Foot/Lbs.
1 3/16-12
1 7/16-12
1 11/16-12

Torque Values: The torque values provided are to provide benchmarks that we believe give optimum results for leak free connections. Actual torque values should be based on individual applications

Alternate Assembly Method
  1. If torque method not possible, follow steps 1-3 above, then proceed to the steps below.
  2. Lightly wrench tighten the nut until there is firm resistance.
  3. Place a wrench on wrench pad next to nut as near the 6 O’clock as possible
  4. Place second wrench on nut as near the 3 O’clock position as possible.
  5. Turn nut clockwise to no less than half way to the 4 O’clock position and no more than the 6 O’clock position.

Why Wet Torque?

Due to the difference in plating types and thickness, materials, and thread quality of different components, the coefficient of friction varies greatly on any given assembly. Lubrication not only produces a more consistent coefficient of friction, it increases clamping force on sealing area with less torque on the threads. Overtightening causes threads to yield, deform and lose their ability to maintain an adequate load or clamping force on the seating area. Extended operation and severe conditions cause further yielding which results in leaks. Overtightening is the single greatest cause for leaks in metal to metal seat hydraulic connections. It is our firm position, that to not wet torque, is to compromise consistency and quality for convenience.