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O-Rings


ST020S Solid PTFE Back-Up Ring



$0.83

Quantity Discount Prices
2-150
$0.83
151-502
$0.664
503+
$0.498
Min Qty:  2
  • Model: ST020S
  • 1 in Stock
  • Fits O-Ring Size -020
  • 0.053" W X 0.893"ID X 0.049"HT
  • 1.347mm W X 22.683mm ID X 1.245mm HT

AS568-020 (0.053" W X 0.893"ID X 0.049"HT)

PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing systems. The amount of this extrusion is affected by O-ring hardness, operating temperature, operating pressure and clearance of the mating surface.

Increased Pressure: The use of Back-up Rings should be considered for systems with operating pressure above 2000 PSI. At these pressures the mechanical forces applied to the O-Ring may cause extrusion of the O-ring into the clearance gap.

Operating temperature: The use of Back-up Rings should be considered for elevated temperatures greater than 160°F (71C). The physical and mechanical properties of O-rings may be affected at these temperatures, this increasing the risk of extrusion into the clearance gap.

Industrial Trends: Today's fluid power systems continue to move towards higher pressures and temperatures. PTFE Back-up Rings should be considered as a reliable component to achieve satisfactory system performance