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AS568-038 O-Ring Size
000 series · 1/16" cross section · Pneumatics, instrumentation, small static seals
Inside diameter × cross section
66.4 × 1.78 mm
2.614″ × 0.07″ ·
outside diameter 69.95 mm (2.754″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 2.614″ | 66.4 mm |
| Cross section (CS) | 0.07″ | 1.78 mm |
| Outside diameter (OD) | 2.754″ | 69.95 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 66.4 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -038 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) |
|---|---|---|---|
| -037 | 63.22 | 2.489″ | 66.78 |
| -039 | 69.57 | 2.739″ | 73.13 |
| -036 | 60.05 | 2.364″ | 63.6 |
| -040 | 72.75 | 2.864″ | 76.3 |