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    Question :
    Explain the nomenclature of a 6203-ZZ bearing.
    Category Mechanical Engineering Interview Questions
    Rating (0.2) By 321 users
    Added on 6/20/2011
    Views 613
    Rate it!

    6 is the type code, which shows it is a single-row ball bearing, 2 is the series, means light, 03 is the bore, which is 17 mm and ZZ is the suffix meaning double shielded bearing.

    First two Digit from left indicates bore dia i.e 03 - means 17 mm bore diameter
    third digit indicates series like heavy, medium light & extra light duty - load carrying bearing here its medium capacity bearing
    Last or forth digit shows types of bearing here its Single row ball bearing
    ZZ indicates double shielded bearing

    Posted by: Nikhil Chotai    

    Contact Nikhil Chotai Contact Nikhil Chotai

    Here is some information on bearing types and nomenclature that I thought
    everyone might enjoy. If you know the bearing number, you don't need to go to
    the dealer, just go to a local bearing distributor or a place that sells gear
    boxes. They should have them or be able to get them in a day.

    A bearing number has four parts to it which includes four numbers and a set of
    letters. Each of the first two numbers stand for something, the last two
    designate size. The letters dictate the variation of the bearing. These letters
    can also be followed by more letters designating internal clearance. In detail:

    First number (will be a 1-7) designates the bearing type:
    1 = Double Row self-aligning
    2 = Double Row self-aligning (wide)
    3 = Double Row
    4 = Angular Contact
    6 = Single Row Deep Groove
    7 = Angular Contact

    The second number designates the series, or cross section. This is basically
    equivalent to the second number of a tire rating, it's a ratio of the bore to
    the width of the bearing, which also controls the O.D. of the bearing. The
    larger the cross section, the larger the O.D. of the bearing.
    18 = Thin Section, Light
    19 = Thin Section, Medium
    0 = Very Light
    2 = Light
    3 = Medium
    4 = Heavy

    The third number (which is a set of two numbers) indicates the bore (in mm) of
    the bearings. All bearings are designated with metric standards, not inches.
    Numbers are as follows:
    00 = 10 mm
    01 = 12 mm
    02 = 15mm
    03 = 17 mm
    For 20-480mm bore bearings: Last 2 digits x 5 = Bore (mm)
    i.e.- if the bearing number was 04 (04 x 5 = 20 mm), 05 (05 x 5 = 25 mm)

    The letters after the number indicate the variation. These change from
    manufacturer to manufacturer, but here are some of the common ones:

    Plain -- No Shield
    Type Z -- One Shield (normally will have metal shields)
    Type 2Z -- Two Shields (one on each side)
    Type RS1 -- One Seal (normally the R indicates rubber)
    Type 2RS1 --Two Seals (one on each side)
    Type LL -- Two Seals (just another manufacturer's designation)
    CD -- 15 degree contact angle (for angular contact)
    ACD = 25 degree contact angle (for angular contact)

    The bearings can also have a C2, C3, C4 or C5 designation after the bearing
    number. This indicates that the internal fit (the inner race to ball to outer
    race) is not standard. If your bearing has one of these designators, make sure
    you get a bearing with the same designator. A C2 is less than standard
    clearance, while a C3, 4, and 5 are larger than standard.

    Posted by: suresh    

    Contact suresh Contact suresh

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