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AS568-229 O-Ring Size
200 series · 1/8" cross section · General purpose, cylinders
Inside diameter × cross section
59.92 × 3.53 mm
2.359″ × 0.139″ ·
outside diameter 66.98 mm (2.637″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 2.359″ | 59.92 mm |
| Cross section (CS) | 0.139″ | 3.53 mm |
| Outside diameter (OD) | 2.637″ | 66.98 mm |
Outside diameter is not measured, it is derived: OD = ID + 2 × CS.
If your measured OD disagrees with this, trust the ID and cross section — measuring
across the outside of a flexible ring is the least reliable of the three.
If you measured a used one
A ring pulled out of service will measure smaller than 59.92 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -229 is very likely still the correct part. Ordering the size your worn ring measures is how the same failure repeats. More on this →
Nearby sizes in the 200 series
These share the same 1/8" cross section, so if the thickness is right but the diameter is off, your ring is probably one of these.
| Dash | ID (mm) | ID (in) | OD (mm) |
|---|---|---|---|
| -228 | 56.74 | 2.234″ | 63.8 |
| -230 | 63.09 | 2.484″ | 70.15 |
| -227 | 53.57 | 2.109″ | 60.63 |
| -231 | 66.27 | 2.609″ | 73.33 |