Rod & Piston (Dynamic) Design Guide
'Rod' & 'Piston' styled O-ring grooves are commonly used dynamic O-ring sealing configurations. This page specifically concerns dynamic (moving) reciprocating Rod & Piston O-ring seals.
The purpose of the tables below are to serve as a design guide for dynamic reciprocating Rod & Piston O-ring grooves using AS568 O-ring sizes*.
* 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.
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Surface Finishes are RMS Values
| DASH # RANGE | O-RING CROSS SECTION | GLAND DEPTH (D) | SQUEEZE | GLAND WIDTH (W) | GLAND CORNER RADIUS | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AS568 | Nominal (in) | Nominal (in) | Actual (in) | Percent | Nominal (in) | R1 (in) | R2 (in) | |||||
| -006 through -012 | 0.070 ± 0.003 | 0.055 - 0.057 | 0.010 - 0.018 | 15 - 25 | 0.093 - 0.098 | 0.01 | 0.005 | |||||
| -104 through -116 | 0.103 ± 0.003 | 0.088 - 0.090 | 0.010 - 0.018 | 10 - 17 | 0.140 - 0.145 | 0.01 | 0.005 | |||||
| -201 through -222 | 0.139 ± 0.004 | 0.121 - 0.123 | 0.012 - 0.022 | 9 - 16 | 0.187 - 0.192 | 0.018 | 0.005 | |||||
| -309 through -349 | 0.210 ± 0.005 | 0.185 - 0.188 | 0.017 - 0.030 | 8 - 14 | 0.281 - 0.286 | 0.028 | 0.005 | |||||
| -425 through -460 | 0.275 ± 0.006 | 0.237 - 0.240 | 0.029 - 0.044 | 11 - 16 | 0.375 - 0.380 | 0.028 | 0.005 | |||||
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