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Thread: Ball bearings

  1. #11
    Join Date
    Jan 2008
    Location
    northants now.
    Posts
    1,550

    Re: Ball bearings

    Photos
    Don't make the Rich Richer, it will only make the Poor Poorer!..

  2. #12
    Join Date
    Jul 2017
    Location
    South from the Deep South
    Posts
    3,187

    Re: Ball bearings

    Quote Originally Posted by sifu 2 View Post
    Bearing in transmission that has Koyo 63/28-3NI. Does anyone know what the 3NI means and also has SH on the inner ring. In addition is there is a groove on outer casing whatís its purpose.


    I have some Koyo bearings 63/28 without 3NI and no outer casing groove and has an extra ball can these be a replacement for the one above..?
    Grove purpose is to take snapring.

    I glanced on JIS bearing numbering catalog, I didn't see NI suffix but the pdf wasn't searchable and there is lot of junk related to the internal tollerances and accessories....
    Polish onslaught

    ...you can lead a horse to water, but you canít make it drink...

  3. #13
    Join Date
    Sep 2014
    Location
    Durham
    Posts
    226

    Re: Ball bearings

    The N is the bearing code for the groove and the groove purpose is for a snap ring to prevent movement in certain applications (gearbox output bearing on the sprocket side are normally grooved with a snap ring fitted and also on 2 stroke crankshafts ). Not sure about the 3(as its not C3 for clearance) or I. The 3 and I could be load related as the grooved bearing has less balls and they also look bigger in the pic(tho hard to tell). Koyo have a habit of using slightly different codes to other manufacturers. I used to work for NSK bearings County Durham and once a month batches of bearings would be made for Koyo, SKF, FAG and RHP to name a few. They were all made on the same machines and then spec'd on assembly according to the order.

  4. #14
    Join Date
    Jun 2005
    Location
    Darrrrnnnn Sarrrffff .
    Posts
    3,453

    Re: Ball bearings

    What part of china is county Durham in ?.... lol
    Mp
    Hcw's , still going strong

  5. #15
    Join Date
    Sep 2014
    Location
    Durham
    Posts
    226

    Re: Ball bearings

    Quote Originally Posted by mp View Post
    What part of china is county Durham in ?.... lol
    Mp
    The North east part

  6. #16
    Join Date
    Jan 2008
    Location
    northants now.
    Posts
    1,550

    Re: Ball bearings

    Thank you all for all your input ...
    Don't make the Rich Richer, it will only make the Poor Poorer!..

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