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80mm Solid Series 25 (Internal gear)

SIG25 Series Solid Section Internal Gear

A modular series of rings with relatively large gear module and wide internally geared ring, offering maximum gear capacity in a small diameter slewing ring. High shear forces are catered for by the pilot diameters, thus reducing the shear force to be carried by the bolts.


The 80SLS20 Series datasheet HERE


SIG 855 25   SIG 955 25   SIG 1055 25   SIG 1155 25   SIG 1255 25   SIG 1355 25
SIG 1455 25   SIG 1555 25


Will be made available on request



All bearings manufactured standard in 42CrMo4 for superior gear strength

Grease points

All bearings supplied with 4 grease points in the outer ring only, DIN 71412A M8x1 equispaced

Consider the GreaseMax Auto lubricators to ensure optimum lubrication in service.

Load and bolt limit curves

Bearings should operate within the prescribed triangular load area at all times.

The bolt limit curve is based on the use of Grade 10.9 bolts

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!

In the search for constant product improevment this information subject to change without notice.

Need help?

For professional assistance 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!