Dynamic O-ring seal groove sizing (piston and rod)
Sizes the piston-bore and rod-bore groove geometry (bore/shaft tolerances, groove width, squeeze) for a dynamic O-ring seal from O-ring cross-section, stretch and squeeze.
Piston side: minimum stretched cross-section, d₂,min1.728 mm
Piston side: groove width, b2.4 mm
Piston side: maximum groove depth, t_max1.6416 mm
Piston side: bore d₄H8 min20 mm
Piston side: bore d₄H8 max20.033 mm
Piston side: shaft d₉f7 min19.98 mm
Piston side: shaft d₉f7 max19.959 mm
Piston side: groove root d₃h9 min16.7498 mm
Piston side: groove root d₃h9 max16.7928 mm
Piston side: minimum groove depth, t_min1.6036000000000001 mm
Piston side: maximum squeeze7.199074074074065 %
Piston side: O-ring nominal diameter, d₁15.765021999999998 mm
Rod side: minimum stretched cross-section, d₂,min1.75707 mm
Rod side: groove width, b2.4 mm
Rod side: maximum groove depth, t_max1.6692164999999999 mm
Rod side: bore d₁₀H8 min20 mm
Rod side: bore d₁₀H8 max20.033 mm
Rod side: shaft d₅f7 min19.98 mm
Rod side: shaft d₅f7 max19.959 mm
Rod side: groove root d₆H9 min23.266433 mm
Rod side: groove root d₆H9 max23.318433 mm
Rod side: minimum groove depth, t_min1.6537164999999998 mm
Rod side: maximum squeeze5.882150398105944 %
Rod side: O-ring nominal diameter, d₁20.28320599 mm
Method & references
- Dynamic O-ring seal groove geometry — piston (cylinder bore) and rod (piston-rod bore) sides.
The computation is a literal port of the original client-side JavaScript from /calculators/e11_3.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.