Rod (Dynamic Rotary) Design Guide
'Rod' styled O-ring grooves are commonly used dynamic rotary O-ring sealing configurations. This page specifically concerns dynamic (moving) rotary Rod O-ring seals.
The purpose of the tables below are to serve as a design guide for dynamic rotary Rod O-ring grooves using AS568 O-ring sizes+.
Please see our General Groove Guide for more information, or feel free to get in touch with our engineers if you have any questions.
*Feet per minute = 0.26 X Shaft Diameter (inches) X rpm
**Total indicator reading between groove OD, shaft, and adjacent bearing surface
*** If clearance (extrusion gap) must be reduced for higher pressures, bearing length M must be no less than the minimum figures given. Clearances given are based on the use of 80 shore durometer minimum O-ring for 55.2 Bar (800 psi) max. See Figure 3-2 for recommended clearances when pressures exceed 55.2 Bar (800 psi).
**** The use of O-rings as high speed rotary shaft seals is usually not recommended for applications requiring lower than -40°C (-40°F) or higher than 121°C (250°F) operating temperatures.
***** The O-ring gland in a rotary shaft application should not be used as a bearing surface. The shaft should be contained by bearings that will permit the O-ring to operate under the lowest possible heat and load
+ Please note that some AS568-0XX O-rings have atypical cross sections. Please see our General Groove Guide for more information, or feel free to get in touch with our engineers if you have any questions about O-rings, gaskets, & custom molded parts.
Surface Finishes are RMS Values
| DASH # RANGE | O-RING CROSS SECTION | MAX ROTATIONAL SPEED * | GLAND DEPTH (D) | SQUEEZE | GLAND WIDTH (W) | CLEARANCE *** (H) | MAX ECCENTRICITY ** | BEARING LENGTH MIN *** (Z) | GLAND CORNER RADIUS | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AS568 | Nominal (in) | Feet Per Min (FPM) | Nominal (in) | Percent | Nominal (in) | Nominal (in) | Nominal (in) | Nominal (in) | R1 (in) | R2 (in) | ||||||
| -004 through -045 | 0.070 ± 0.003 | 200 - 1500 | 0.065 - 0.067 | 0 - 11 | 0.075 - 0.079 |
0.012 - 0.016 |
0.002 | 0.7 | 0.01 | 0.005 | ||||||
| -102 through -163 | 0.103 ± 0.003 | 200 - 600 | 0.097 - 0.099 | 1 - 8.5 | 0.108 - 0.112 |
0.012 - 0.016 |
0.002 | 1.03 | 0.01 | 0.005 | ||||||
| -201 through -258 | 0.139 ± 0.004 | 200 - 400 | 0.133 - 0.135 | 0 - 7 | 0.144 - 0.148 |
0.016 - 0.020 |
0.003 | 1.39 | 0.018 | 0.005 | ||||||
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