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Home Workshop > Projects Area > Machine Restoration > Bridgeport series 1 knee bearing specification

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Bridgeport series 1 knee bearing specification

Bridgeport series 1 knee bearing specification

Hi Chaps can you shed any light on the correct specification for a series 1 Bridgeport knee bearing. The removed bearing is a R&M England bearing but I have no results when googling the no -  imj30wrr.
The size 30x72x30.2 corresponds to a 3306 bearing and it has 2 rubber shields.
However 3306 angular ball bearings that I have been able to source are all back to back or face to face. Surely these knee bearings should be in tandem? After all the weight is acting downwards so why need axial load capacity in two directions?
Please elucidate me.
To add complications the UK Bridgeport stockist lists the bearing (unspecified) priced halfway between a budget bearing and a SKF bearing - now usually main agents charge a lot more than bearing suppliers which makes me think it is a budget bearing. So is a Dunlop bearing for example adequate in this application? Normally I would not consider anything but top name bearings considering budget bearings false economy but there is £80 difference in this case hence the nagging doubt allied with the main agents strange price and unwillingness to specify.

David Child
1 Posts
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Re: Bridgeport series 1 knee bearing specification

Hi David,

I find the Practical machinist forum … nd-lathes/ very good for BP questions,

It strikes me that this bearing is not under a great deal of strain ie it only has to cope with the occasional winding so perhaps a budget bearing is fine ?

With ref to the end x axis bearing bracket you are after have you tried Darren Goodwin at  ?  he sells DRO's but I know he rebuilds BP & the like, you could ask for one on the Practical Machinist forum - there are some UK members.


Anthony Ray
Charge Hand
49 Posts
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Re: Bridgeport series 1 knee bearing specification

Hi David

As Tony says the Practical Machinist forum is a good source of answers.  What looks to be chapter and verse on your bearing search … gs-320940/  . Short answer is the 3306 fits and works fine.  The OE one is said to be a special.  Wonder why.

Bearing does need to withstand some pull force as well as the obvious push ones.  Not unknown for folk to forget to unlock the knee before attempting to move it.


Clive Foster
Charge Hand
42 Posts
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