O-Ring Groove & Gland Design Calculator (Squeeze, Fill, Stretch)
Size an O-ring groove: gland depth, width, squeeze, fill and stretch for static, radial and dynamic seals · free, no signup
See O-Ring Groove & Gland Design Calculator (Squeeze, Fill, Stretch) in action
Free O-Ring Groove & Gland Calculator
An O-ring seals by being squeezed between two surfaces, but the groove must leave room for it to deform. Enter the O-ring cross-section and inner diameter, choose the application — static face, static radial or dynamic — and the tool returns the recommended groove depth and width, the O-ring's outer diameter, and checks your own groove for squeeze percentage, gland fill and stretch against the usual design limits.
A table lists recommended depths for the common cross-sections from 1 mm to 6.99 mm. Use it for machined, moulded or 3D printed seal grooves; for high pressures, unusual fluids or hard materials consult the seal supplier.
Key features
Gland depth and width
Calculated from cross-section and application.
Squeeze, fill and stretch checks
Flags values outside typical limits.
Common cross-section table
1.0 to 6.99 mm.
Static and dynamic
Different squeeze ranges for each.
How to use it
- Enter cross-section and inner diameter.
- Choose the application.
- Optionally enter your groove depth and width.
- Read the checks.
Worked example
Example
A 2.62 mm cross-section O-ring in a static face seal with the recommended 1.97 mm groove depth has 25% squeeze and about 72% gland fill — both within the usual limits.
Who uses this tool
Mechanical designers
Size seal grooves.
3D printing users
Design printed seals.
Maintenance
Check an existing groove.
Students
Seal design exercises.
Tips for the best results
- Static face seals use 20–30% squeeze.
- Keep dynamic squeeze at 8–16%.
- Fill should stay under 85%.
- Break sharp groove edges.
Common mistakes to avoid
- Using static squeeze for dynamic seals.
- Forgetting the fluid swell of the elastomer.
- Excess stretch over 5%.
Why use AZRS QuickFix?
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Frequently asked questions
What is squeeze?
How much the cross-section is compressed.
What is gland fill?
O-ring area divided by groove area.
Does it work for AS568 sizes?
Yes, use the cross-section and ID.
Is it valid at high pressure?
Use the supplier's data above about 100 bar.