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South Bend, IN 360001


T-Lon Solutions

GRM Metric Bi-Directional Rod Seal

The GRM metric rod seal is a proven reliable seal for both low and high pressure systems. The GRM seal is a bi-directional seal and filled T-LON® PTFE compound with an oring elastomer energizer designed for reciprocating applications. The filled PTFE seal ring is manufactured with an interference fit with the rod and optimum compression with the o-ring energizer. The optimized sealing surface allows a fluid film to form between the seal and rod during reciprocating motion with excellent sealability for static holding applications.

Face Grooves (Optional): For applications of high pressure rise rates, pressure spikes, and rapid change of direction, the seal is apt to experience blow-by. To prevent blow-by and to energize the seal rapidly, face grooves are added to both sides of the seal.


  • Low seal drag/friction (Minimize energy loss)
  • No Stick-slip (Smooth Operation)
  • Long seal life from T-LON® filled PTFE compounds
  • Available for rods up to 500 mm


  • Hydraulic Rams/Presses
  • Hydraulic & Pneumatic Valves
  • Injection Molding Machines

Technical Data: 

(1)T-LON® seal compound determines allowable pressure and velocity ranges • Velocity: Up to 4 m/s • Pressure: Up to 60 MPa (Function of e-gap and T-LON® compound. Max velocity and pressure cannot be used together)

Most Common:

BRONZE FILLED PTFE (“21” or “22”)

  • Highest Extrusion Resistance (Higher bronze content increases extrusion/wear resistance; I.E. larger e-gap allowable)
  • Good sealability


  • Good for pneumatics and nonlubricating fluids
  • More chemical resistant and used in applications with short stroke movements/vibrations

(2) Loader compound determines temperature and chemical compatibility

Most Common:

NBR SHORE 70 A (“P”)

  • Working Temp. Range -35°C to 110°C (121°C intermittent)
  • Commonly used with greases, aliphatic hydrocarbon mineral and vegetable oils, and various hydraulic fluids


  • Working Temp. Range -45°C to 150°C (204°C steam intermittent)
  • Commonly used with water, steam, water/ silicone/ glycol based fluids, and app’s affected by ozone and weathering.

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Have questions? Our team is ready to help with anything you need. Feel free to reach out.

Contact T-Lon 888.340.TLON