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AS568-274 O-Ring Size
200 series · 1/8" cross section · General purpose, cylinders
Inside diameter × cross section
253.59 × 3.53 mm
9.984″ × 0.139″ ·
outside diameter 260.65 mm (10.262″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 9.984″ | 253.59 mm |
| Cross section (CS) | 0.139″ | 3.53 mm |
| Outside diameter (OD) | 10.262″ | 260.65 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 253.59 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -274 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) |
|---|---|---|---|
| -273 | 247.24 | 9.734″ | 254.3 |
| -272 | 240.89 | 9.484″ | 247.95 |
| -275 | 266.29 | 10.484″ | 273.35 |
| -271 | 234.54 | 9.234″ | 241.6 |