Free Engineering Tool
O-Ring Gland & Groove Calculator
Enter your O-ring cross-section and application, and we'll return recommended groove (gland) dimensions — depth, width, squeeze, and gland fill — based on standard static/dynamic sealing practice. Every O-ring and gland we make is custom to your drawing and material spec.
How to use this calculator
- Set units and cross-section (CS). CS is the O-ring's stock thickness (the round diameter of the ring itself), not its inner diameter. Know the AS568 dash number? The matching series is listed for you — otherwise choose "Custom" and enter the CS.
- Choose the application type. Static, dynamic (reciprocating), face/flange, or rotary. This sets the recommended squeeze range — static seals take more squeeze for a tight seal; dynamic and rotary use less to limit friction and heat.
- Fine-tune target squeeze with the slider if your design requires it, staying inside the range shown.
- (Optional) Enter the O-ring ID for an install-stretch check — keep stretch on the ID under about 5%.
- Machine the gland to the results: cut the groove to the depth shown, set the width for ~75% gland fill (stay within the 60–85% range), hold the surface finish, and add the groove-bottom radius. Heed the fill warning — over 90% risks groove damage from thermal or chemical swell.
Squeeze = how much the cross-section is compressed inside the gland (this creates the seal force). Gland fill = how much of the groove's volume the O-ring occupies — room must remain for the material to expand. All values are engineering starting points: send us your drawing and we'll finalize the gland for your pressure, temperature, and fluid.
Your inputs
20%
Recommended gland
Groove depth—
Groove width (≈75% fill)—
Actual squeeze—
Gland fill—
Surface finish (seal face)—
Groove bottom radius—
Install stretch (ID)—
Need this O-ring or gland made to your exact spec?
Send us your drawing →Guidance is based on widely published static/dynamic O-ring gland design practice (e.g. Parker & Apple Rubber handbooks) for rectangular glands. Final dimensions should be verified against your operating pressure, temperature, fluid, and material compression set / swell. Rotary and high-pressure/anti-extrusion applications are specialized — our engineers can size these for you.
