AS568-251 O-Ring
Standard Aerospace Size O-Ring | SAE AS568B
Dimensions (Imperial)
| Inner Diameter (ID) | 5.109" ±0.005" |
| Cross Section (CS) | 0.139" ±0.004" |
| Outer Diameter (OD) | ~5.387" |
Dimensions (Metric)
| Inner Diameter (ID) | 129.77 mm |
| Cross Section (CS) | 3.53 mm |
| Outer Diameter (OD) | ~136.83 mm |
Tolerance Class
Standard AS568B Class 2 tolerances apply. For critical applications requiring tighter tolerances, specify Class 1 when ordering.
Cross Reference
| BS 1806 (British) | BS-251 |
Frequently Asked Questions
What are the dimensions of AS568-251?
AS568-251 has an Inner Diameter (ID) of 5.109" (129.77mm) and Cross Section (CS) of 0.139" (3.53mm).
What materials are available for AS568-251?
Common materials include Nitrile (NBR), Viton (FKM), EPDM, and Silicone. See our material guide for selection help.