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56mm FUN 20 Series (Flanged UnGeared)

The FUN 20 "light" series is typically used in simple mechanical handling devices, loading swivels, assembly jigs, conveyors and funfair rides where the load is relatively concentric to the axis of rotation.

QCB® imperial bearings are broadly equivalent to the KAYDON RK6-P range imperial dimensions. In some cases the number of bolt holes differs.

FUN 20 metric series dimensions



* - "00" may be replaced by other digits denoting non standard drilling patterns or other features


FUN 20 Series catalogue HERE

FUN418.20        FUN505 20        FUN650.20        FUN750.20
FUN850.20        FUN950.20        FUN1050.20      FUN1200.20

FUN 418.20     FUN 505.20     FUN650.20        FUN 750.20   
FUN850.20      FUN950.20      FUN 1050.20     FUN 1200.20


  • Usually manufactured in C45 steel (Europe) or 50Mn (China), roughly equivalent to BS 080M46.

Grease points

  • Ungeared units will have grease points on both rings DIN 71412A M8x1 equispaced. Variations exist!

Load and bolt limit curves

If both radial and axial loads act upon the bearing, these should be converted to a single equivalent load to enable accurate graphical analysis. Bearings should operate within the prescribed triangular load area at all times.

The bolt limit curve is based on the use of Grade 8.8 bolts. An improvement to this can be achieved by using Grade 10.9 bolts, but only after consultation with and approval of the NBC Technical Department.

If the load is suspended, or the axis of rotation is not vertical, refer the application details to NBC Technical Department.

Interchange information

Generally accepted interchange numbers are listed below. However, variations exist and all queries should be referred to our Technical Department for analysis.

Dimensional equivalence does not always imply equal performance!

In our quest for continual product improvement this information is subject to change without notice.

For all enquiries contact the NBC Slewing ring experts


 Excellence in rotation!


Whilst every effort has been made to ensure the accuracy of the information on this website, if you spot a mistake please inform the Thanks!