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AS568-227 O-Ring Size
200 series · 1/8" cross section · General purpose, cylinders
Inside diameter × cross section
53.57 × 3.53 mm
2.109″ × 0.139″ ·
outside diameter 60.63 mm (2.387″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 2.109″ | 53.57 mm |
| Cross section (CS) | 0.139″ | 3.53 mm |
| Outside diameter (OD) | 2.387″ | 60.63 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 53.57 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -227 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) |
|---|---|---|---|
| -226 | 50.39 | 1.984″ | 57.45 |
| -228 | 56.74 | 2.234″ | 63.8 |
| -225 | 47.22 | 1.859″ | 54.28 |
| -229 | 59.92 | 2.359″ | 66.98 |