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AS568-319 O-Ring Size
300 series · 3/16" cross section · Heavy hydraulics, higher pressure
Inside diameter × cross section
26.34 × 5.33 mm
1.037″ × 0.21″ ·
outside diameter 37.01 mm (1.457″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 1.037″ | 26.34 mm |
| Cross section (CS) | 0.21″ | 5.33 mm |
| Outside diameter (OD) | 1.457″ | 37.01 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 26.34 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -319 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 300 series
These share the same 3/16" 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) |
|---|---|---|---|
| -318 | 24.76 | 0.975″ | 35.43 |
| -320 | 27.94 | 1.1″ | 38.61 |
| -317 | 23.16 | 0.912″ | 33.83 |
| -321 | 29.51 | 1.162″ | 40.18 |