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56mm Solid Light Series 20 (External gear)

SEG 20 Series (Solid External Gear)

The SEG 20 Series rings have a constant height of 56mm across the diameter range as the rectangular cross section gives them improved torsional stiffness compared to flanged bearings, with longer life being the main advantage.

These units are similar to the American KAYDON HS6-E series which feature imperial dimensions and American involute stub gears. 

Within the QCB® range we offer

  • The widest range (metric and inch)
  • Non standard drilling patterns
  • Location diameters as standard
  • Zinc plating, black oxide, painted or Nylon coatings for corrosion resistance


Full 56SLS20 Series datasheet HERE


SEG 505 20   SEG 650 20   SEG 750 20   SEG 850 20   SEG 950 20   SEG 1050 20   SEG 1200 20


Available on request





From 2014 all QCB® geared slewing rings are made in 42CrMo4 for superior gear strength

Grease points

Usually supplied with 4 grease points in the inner ring only, DIN 71412A M8x1 equispaced.

Load and bolt limit curves

Bearings should operate within the prescribed triangular load area at all times. If a combination of axial and radial loads act on the bearing they should be converted to a single equivalent load for graphical analysis.

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 approval of the NBC Technical Department.

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

Interchange information

This information offers generally accepted interchange numbers. However, variations exist and all queries should be referred to our Technical Department for analysis. Dimensional equivalence does not always imply equal performance!

Full NBC part reference dependent on final specification e.g. SEG 505 20 51 CC LM.

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

Need help?

Contact the NBC Slewing ring experts by phone on +44 (0)1952 222300, by fax on +44 (0)1952 242938 or e-mail

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!