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AS568-107 O-Ring Size
100 series · 3/32" cross section · Hydraulics, pumps, valves
Inside diameter × cross section
5.21 × 2.62 mm
0.205″ × 0.103″ ·
outside diameter 10.44 mm (0.411″)
Dimensions
| Dimension | Inches | Millimetres |
|---|---|---|
| Inside diameter (ID) | 0.205″ | 5.21 mm |
| Cross section (CS) | 0.103″ | 2.62 mm |
| Outside diameter (OD) | 0.411″ | 10.44 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 5.21 mm, because compression set is permanent. If your measurement came in a little under this and the cross section roughly matches, -107 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) |
|---|---|---|---|
| -106 | 4.42 | 0.174″ | 9.65 |
| -108 | 6.02 | 0.237″ | 11.25 |
| -105 | 3.63 | 0.143″ | 8.86 |
| -104 | 2.84 | 0.112″ | 8.08 |