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AS568-025 O-Ring Size
000 series · 1/16" cross section · Pneumatics, instrumentation, small static seals
Inside diameter × cross section
29.87 × 1.78 mm
1.176″ × 0.07″ ·
outside diameter 33.43 mm (1.316″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 1.176″ | 29.87 mm |
| Cross section (CS) | 0.07″ | 1.78 mm |
| Outside diameter (OD) | 1.316″ | 33.43 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 29.87 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -025 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 000 series
These share the same 1/16" 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) |
|---|---|---|---|
| -024 | 28.3 | 1.114″ | 31.85 |
| -026 | 31.47 | 1.239″ | 35.03 |
| -023 | 26.7 | 1.051″ | 30.25 |
| -027 | 33.05 | 1.301″ | 36.6 |