Bearing /oil seal fitting tolerance

[Roger Flaherty 1Participant @rogerflaherty1]

I'm maching a shaft seal for a model submarine. The shaft is 4mm dia, the bearing 10mm dia and the oil seal 12mm dia. What diameters should I machine the housing for the correct fit for the bearing and seal. Many thanks Roger

[Roger Flaherty 1Participant @rogerflaherty1]

[Roger Flaherty 1Participant @rogerflaherty1]

Just to add, the housing is stainless steel, any advice would be much appreciated.

[Keith LongParticipant @keithlong89920]

Roger

Just put "fits for bearing housings" into Google and you'll come up with pages of information. The first "hit" I get is for SKF. You'll need to read through it and open the various pdfs that they have. Fit can depend on whether its the shaft that rotates or the housing and what loads in what directions are applied – it literally ISN'T a case of one size fits all. Oil seal will be more tolerant but a similar search shoud come up with the goods as well.

[Roger Flaherty 1Participant @rogerflaherty1]

Keith, Many thanks, why didn't I think of doing that. Have just Googled for oil seal fit and found answer quickly. Many thanks. Roger

[Roger Flaherty 1Participant @rogerflaherty1]

Keith

After much reading I came across a piece on the SKF Web site which said that 'rubber' oil seals have the 'fit amount' built in and sure enough when I measured the new seal it was oversized by 23 micro mm (the recommended amount) and push fitted into the 12mm housing. Again thanks for your help. Roger

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