AS568-391 O-Ring
Standard Aerospace Size O-Ring | SAE AS568B
Dimensions (Imperial)
| Inner Diameter (ID) | 21.955" ±0.007" |
| Cross Section (CS) | 0.21" ±0.005" |
| Outer Diameter (OD) | ~22.375" |
Dimensions (Metric)
| Inner Diameter (ID) | 557.66 mm |
| Cross Section (CS) | 5.33 mm |
| Outer Diameter (OD) | ~568.32 mm |
Tolerance Class
Standard AS568B Class 2 tolerances apply. For critical applications requiring tighter tolerances, specify Class 1 when ordering.
Frequently Asked Questions
What are the dimensions of AS568-391?
AS568-391 has an Inner Diameter (ID) of 21.955" (557.66mm) and Cross Section (CS) of 0.21" (5.33mm).
What materials are available for AS568-391?
Common materials include Nitrile (NBR), Viton (FKM), EPDM, and Silicone. See our material guide for selection help.