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.
Built for demanding industries
Why O-Ring Verify
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
Aggregate results across calculators into a single, 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.