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AS568-173 O-Ring Size
100 series · 3/32" cross section · Hydraulics, pumps, valves
Inside diameter × cross section
215.57 × 2.62 mm
8.487″ × 0.103″ ·
outside diameter 220.8 mm (8.693″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 8.487″ | 215.57 mm |
| Cross section (CS) | 0.103″ | 2.62 mm |
| Outside diameter (OD) | 8.693″ | 220.8 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 215.57 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -173 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 100 series
These share the same 3/32" 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) |
|---|---|---|---|
| -172 | 209.22 | 8.237″ | 214.45 |
| -174 | 221.92 | 8.737″ | 227.15 |
| -171 | 202.87 | 7.987″ | 208.1 |
| -175 | 228.27 | 8.987″ | 233.5 |