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AS568-003 O-Ring Size
000 series · 1/16" cross section · Pneumatics, instrumentation, small static seals
Inside diameter × cross section
1.42 × 1.52 mm
0.056″ × 0.06″ ·
outside diameter 4.47 mm (0.176″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 0.056″ | 1.42 mm |
| Cross section (CS) | 0.06″ | 1.52 mm |
| Outside diameter (OD) | 0.176″ | 4.47 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 1.42 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -003 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) |
|---|---|---|---|
| -002 | 1.07 | 0.042″ | 3.61 |
| -004 | 1.78 | 0.07″ | 5.33 |
| -001 | 0.74 | 0.029″ | 2.77 |
| -005 | 2.57 | 0.101″ | 6.12 |