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AS568-364 O-Ring Size
300 series · 3/16" cross section · Heavy hydraulics, higher pressure
Inside diameter × cross section
170.81 × 5.33 mm
6.725″ × 0.21″ ·
outside diameter 181.48 mm (7.145″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 6.725″ | 170.81 mm |
| Cross section (CS) | 0.21″ | 5.33 mm |
| Outside diameter (OD) | 7.145″ | 181.48 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 170.81 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -364 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) |
|---|---|---|---|
| -363 | 164.46 | 6.475″ | 175.13 |
| -365 | 177.16 | 6.975″ | 187.83 |
| -362 | 158.11 | 6.225″ | 168.78 |
| -366 | 183.51 | 7.225″ | 194.18 |