Professional O-Ring Engineering Platform
O-ring design, groove calculation, material selection, verification and engineering references — built for reliable sealing design.
Platform capabilities
Every seal type and check, on its own page.
From the Knowledge Center
View all guidesHow to Measure an O-Ring
Measure O-ring inner diameter, outer diameter and cross-section correctly, convert between them, and match your measurements to AS568 or ISO 3601 standard sizes.
GuideWhat is gland fill?
Why an O-ring groove must never be completely filled, how thermal expansion and media swell consume free volume, and how to check gland fill across tolerances.
GuideWhat is O-ring squeeze?
How compression creates and maintains a seal, typical squeeze ranges for static and dynamic O-ring applications, and how to calculate it across tolerances.
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Why O Ring Design
Complete calculation coverage
Static, dynamic, face, boss, crush, dovetail and non-circular face seals in one place.
Rich material database
Compare elastomers by media, temperature range, hardness and duty suitability.
Transparent engineering rules
Squeeze, gland fill, stretch and extrusion checks with the reasoning shown.
Design reports
Turn a selected seal calculation into a focused, shareable design summary.
Multiple seal structures
One workflow spanning the seal types real hardware actually uses.
Built for real engineering
Focused on practical design and verification, not marketing.
Frequently asked questions
What is O-ring squeeze?
Squeeze is the diametral compression applied to an O-ring cross-section when it is installed in a groove, usually expressed as a percentage of the cord diameter. Correct squeeze is what creates and maintains the seal.
What is gland fill?
Gland fill is the percentage of the groove volume occupied by the O-ring. It must leave room for thermal expansion and swell; too high a fill can over-stress the seal and the groove.
Static seal vs dynamic seal — what's the difference?
A static seal has no relative motion across the sealing interface, while a dynamic seal must accommodate movement. Dynamic applications drive tighter limits on squeeze, surface finish and friction.