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AS568-217 O-Ring Size
200 series · 1/8" cross section · General purpose, cylinders
Inside diameter × cross section
29.74 × 3.53 mm
1.171″ × 0.139″ ·
outside diameter 36.8 mm (1.449″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 1.171″ | 29.74 mm |
| Cross section (CS) | 0.139″ | 3.53 mm |
| Outside diameter (OD) | 1.449″ | 36.8 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 29.74 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -217 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) |
|---|---|---|---|
| -216 | 28.17 | 1.109″ | 35.23 |
| -218 | 31.34 | 1.234″ | 38.4 |
| -215 | 26.57 | 1.046″ | 33.63 |
| -219 | 32.92 | 1.296″ | 39.98 |