Identifying an oil seal number can be very tricky
particularly if you are using the imperial sizes. Here you will have a quick guide on how to
correctly measure an oil seal.
There are two types of measurement used in oil seals,
the metric oil seals and the imperial oil seals. Among the two, metric oil seals are more
straightforward because the size is already stamped on the seal. Say for example, 20 47 7 means that the
inside of the oil seal is 20mm, outside is 47mm and the width is 7mm.
While, imperial oil seals is trickier because the oil
seal numbers are not written in fractions and it starts with the outside
diameter. For example, 187 125 25
indicates that the sizes of the oil seal is 1.1/4” inside, 1.7/8”outside and 1/4
wide. The first number is always the
outside diameter.
Do you need oil seals?
Macina offers WLK Oil Seal from Taiwan and Musashi Oil seals from Japan,
for further inquiries email us at export@macina.ae
or visit our official website at www.macina.ae.
Want to read more oil seal, belt and bearing blogs? Come and visit our website at www.macina.ae.
By: Aileen Billones
I really appreciate your post and you explain each and every point very well. Thanks for sharing this information. And I’ll love to read your next post too.Oil seals
ReplyDeleteI believe that the numbers stamped actually correspond to the size of the application that the seal is inserted into.
ReplyDeleteSo 20 47 7 means that the shaft size of your engine (or whatever application) is 20, bore size is 47 and the depth of the seal groove is 7.
The actual seal will have a tighter ID (~ 19) and a larger OD (~ 47.75) so that there is an interference fit to create the sealing pressure.
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