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Rotary O-Ring Seal Gland


Click image above to see design charge, table and guide 5-4


An O-ring has proved to be a practical rotary shaft seal in many applications. With the correct design, Parker O-Ring rotary seal compound N1090-85, will provide satisfactory service at surface speeds up to 1500 feet per minute.

The design conditions are most critical for rotary seals, as would be expected. Relatively high durometer compounds, close control of tolerances, and minimum cross section are required.


Key design points:

•Rotary seals are best if temperature is not colder than -40°C (-40°F)
•Hardened steel shaft materials will wear less
•Design for minimum stretch on the O-ring inner diameter
•Optimum design is dependent on the rotational speed in Feet Per Minute (Feet per minute = .26 x Shaft Diameter (inches) x rpm
•The smallest “W” cross-sectional diameter will have the least amount of friction



  Maximum recommended    "W" Cross-section diameter
Speed (fpm) 0.139" 0.103" 0.070"
0 to 200 Use Reciprocating Design Guide
200 to 400 yes yes* yes
400 to 600   yes* yes
600 to 1500     yes
*  .103" “W” dimension is often best option for speeds up to 600 fpm


Design chart 5-4 provides the basis for calculating gland dimensions for rotary O-ring use. For standard O-ring sizes, the hardware dimensions have been calculated and are listed in the design guides pages.

Parker Hannifin
O-Ring Division
2360 Palumbo Drive
Lexington, KY 40509
Ph: 859-269-2351
Fax: 859-335-5128