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AS568-452 O-Ring Size
400 series · 1/4" cross section · Industrial flanges and piping
Inside diameter × cross section
247.01 × 6.99 mm
9.725″ × 0.275″ ·
outside diameter 260.99 mm (10.275″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 9.725″ | 247.01 mm |
| Cross section (CS) | 0.275″ | 6.99 mm |
| Outside diameter (OD) | 10.275″ | 260.99 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 247.01 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -452 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 400 series
These share the same 1/4" 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) |
|---|---|---|---|
| -451 | 240.66 | 9.475″ | 254.63 |
| -453 | 253.36 | 9.975″ | 267.33 |
| -450 | 234.31 | 9.225″ | 248.28 |
| -449 | 227.96 | 8.975″ | 241.94 |