An O-ring is a donut-shaped ring of molded, flexible material with a round cross-section
that can be either solid or hollow. These flexible rings are designed to be inserted into a groove (referred to as a
gland) where they predictably “de-form” themselves to completely fill the gap in the cavity, creating a perfect
seal.
Elegantly simple in function, the classic O-ring is the most popular choice for
engineers as an ideal, cost-effective solution for a myriad of sealing challenges.
Best used as a static seal, O-rings provide reliable, leak-free seals with ease
of installation.
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Advantages
to using
O-rings
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1. SIZE
• ID (inner dimension)
• CS (cross-section)
2. MATERIAL
• Elastomer
• Durometer (hardness)
When ordering O-rings, elastomeric compounds need to be added to size.
For example:
Size: 2-210
Compound:
Nitrile 70 durometer
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Web Seal provides O-rings in all standard and metric sizes, as well as international
and special sizes.
The O-ring sizes on this chart apply only to standard (AN) shrinkage materials, corresponding to AS568A dimensions.
Elastomers with different shrinkage rates will have slightly different dimensions and tolerance rates.
Standard sizes are listed in inches and metric equivalent sizes in millimeters.
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