Oil Seal Size Chart: How to Measure and Order the Right Rubber Oil Seal
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A leaking oil seal can damage bearings, pumps and gearboxes. Ordering the right replacement is easy once you know the three numbers every rubber oil seal is sold by.
How oil seal sizes are written
Oil seals are sold by three measurements in millimetres, always in this order:
- ID (inner diameter): the shaft size the seal fits around.
- OD (outer diameter): the size of the hole (housing) the seal presses into.
- Width (thickness): how deep the seal is.
For example, a 90 x 140 x 13 mm oil seal fits a 90 mm shaft, sits in a 140 mm housing and is 13 mm thick.
How to measure an old oil seal
- Read the size printed on the side of the old seal if it is still visible.
- If not, measure the shaft diameter with a vernier caliper. This is the ID.
- Measure the housing bore. This is the OD.
- Measure the thickness of the old seal. This is the width.
Measure the shaft and housing rather than a worn seal when you can, because old seals stretch and lose shape.
Tips for fitting
- Clean the shaft and housing and check the shaft for scratches.
- Apply a little oil or grease on the seal lip before fitting.
- Press the seal in evenly so it sits square in the housing.
Shop oil seals
Find your size in our rubber oil seals collection, which lists seals by ID x OD x width. You may also need bearing pullers to remove old bearings, or SKF bearings for replacement.
