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AS568-048 O-Ring Size
000 series · 1/16" cross section · Pneumatics, instrumentation, small static seals
Inside diameter × cross section
120.37 × 1.78 mm
4.739″ × 0.07″ ·
outside diameter 123.93 mm (4.879″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 4.739″ | 120.37 mm |
| Cross section (CS) | 0.07″ | 1.78 mm |
| Outside diameter (OD) | 4.879″ | 123.93 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 120.37 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -048 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) |
|---|---|---|---|
| -047 | 114.02 | 4.489″ | 117.58 |
| -049 | 126.72 | 4.989″ | 130.28 |
| -046 | 107.67 | 4.239″ | 111.23 |
| -050 | 133.07 | 5.239″ | 136.63 |