SEG 20 Metric Series

Two solid section rings separated by a 20mm ball set, with the outer ring being geared. This series has a constant height of 56mm, and a standard range of external diameters ranging from 486mm to 1166mm.

All QCB® slewing rings are manufactured to the highest possible quality levels in ISO certified factories. A QCB® Quality Standard defines all aspects of their dimensions and tolerances as well as all aspects of manufacturing from materials properties, all stages of production, as well as packing and labelling.

Whilst the data on the site is updated regularly, we reserve the right to implement subtle changes to these standards in our quest for continual product improvement.


  • Industrial positioners (e.g. welding assemblies and jigs)
  • Ship or truck loading chutes and swivels
  • Stretch wrapping machines
  • Conveyors and other materials handling equipment
  • Simple amusement rides

Need help?

Our technical team have many years of experience and are happy to assist with selection. Call or e-mail them for fast, efficient and professional advice.

The Design Form will assist you in defining your application details.

QCB referenceOutline dimensions & weight
DaDiUCda f9di H9Load curveWeight
SEG 505 20 01 AA LM503.3342415.5412.53441431
SEG 650 20 01 AA LM640.6472545.5542.54741543
SEG 750 20 01 AA LM742.3572645.5642.55741652
SEG 850 20 01 AA LM838.1672745.5742.56741759
SEG 950 20 01 AA LM950.1772845.5842.57741871
SEG 1050 20 01 AA LM1046.1872945.5942.58741977
SEG 1200 20 01 AA LM1198.110221095.51092.510242091
QCB referenceOuter holesInner holes20o spur gear
LanaLiniPmzFz MAX
mm mm mm KN
SEG 505 20 01 AA LM455203682449559929
SEG 650 20 01 AA LM5852849832630610535
SEG 750 20 01 AA LM6853259836732612235
SEG 850 20 01 AA LM7853669840828613835
SEG 950 20 01 AA LM8853679840936811747
SEG 1050 20 01 AA LM98540898441032812947
SEG 1200 20 01 AA LM1135441048481184814847
Standard grease fitting# at least 2x M8 on inner ring

Interchange information

The SEG20 Metric Series is interchangeable with bearings from other manufacturers such as Roth Erde, Torriani Gianni, INA, Schaeffler, SKF, RKS, RIMA, La Leonessa and many more. However there may be variations to this rule (e.g. OEM variants) and we invite you to refer to our technical staff for assistance.

SEG 505 20 01 AAE 505 20 00 CC31.0411.01.ZZ.00171.20.0414.00.00.10VSA 20 0414 N061.20.0414.500.01.1503
SEG 650 20 01 AAE 650 20 00 CC31.0541.01.ZZ.00171.20.0544.00.00.10VSA 20 0544 N061.20.0544.500.01.1503
SEG 750 20 01 AAE 750 20 00 CC31..0641.01.ZZ.00171.20.0644.00.00.10VSA 20 0644 N061.20.0644.500.01.1503
SEG 850 20 01 AAE 850 20 00 CC31.0741.01.ZZ.00171.20.0744.00.00.10VSA 20 0744 N061.20.0744.500.01.1503
SEG 950 20 01 AAE 950 20 00 CC31.0841.01.ZZ.00171.20.0844.00.00.10VSA 20 0844 N061.20.0844.500.01.1503
SEG 1050 20 01 AAE 1050 20 00 CC31.0941.01.ZZ.00171.20.0944.00.00.10VSA 20 0944 N061.20.0944.500.01.1503
SEG 1200 20 01 AAE 1200 20 00 CC31.1091.01.ZZ.00171.20.1094.00.00.10VSA 20 1094 N061.20.1094.500.01.1503

Custom designs

  • Double drilled or custom drilling patterns
  • Higher precision bearings with location diameters
  • Reduced internal clearance (Class 5 & Class 6)
  • Black oxide or zinc plating for enhanced corrosion protection
  • Epoxy paint or even Nylon coated units to special order
  • Stainless steel or aluminium versions


From 2015 all SEG20 Metric Series slewing rings will be manufactured in 42CrMo4 steel. Smaller units are usually produced in 50Mn / C45.

Internal construction

Standard SEG20 Series bearings incorporate plastic spacers, but ball spacers, steel or brass spacers, or even full complement and caged designs can be supplied for specific applications.


A land riding NBR (nitrile rubber) seal strip is standard. VITON seals can be supplied to order.


The SEG20 Metric series has a standard 20° pressure angle, uncorrected spur gear cut into the outer ring.


QCB® Slewing rings are assembled with a small quantity of Lithium EP2 grease. It is important that all slewing rings are greased during installation and prior to operation. SEG20 Metric Series slewing rings will usually have 4 or 6 grease nipples DIN 71412 M8x1 on the radial face of each ring. Sufficient grease nipples for all holes as well as Nylon plugs (to insert if a grease nipple is not required) are supplied with each ring.

Special greases can be supplied on demand as can GreaseMax Automatic Lubricators and Accessories.

Load & Bolt limit curves

If both a radial and an axial load act on the bearing these must be combines into a single equivalent load to enable basic selection from the load curves. The raceway limit is illustrated by the blue line, the red line illustrates the limit for the specified number of Grade 8.8 bolts.The load point should be well under the relevant load curve for long life.

Grade 10.9 bolts can be used but only after approval by our technical team.

Similarly if the load is suspended or the axis of rotation is not vertical please refer the application details to us and take advantage of our decades of experience!


Need help?

01952 222400

QCB referencePDF PrintCAD.dwgMODEL.STP
SEG 505 20 00 CC LMSEG 505 20.pdfSEG 505 20.dwgSEG 505 20.STP
SEG 650 20 00 CC LMSEG 650 20.pdfSEG 650 20.dwgSEG 650 20.STP

SEG 750 20 00 CC LM

SEG 750 20.pdfSEG 750 20.dwgSEG 750 20.STP
SEG 850 20 00 CC LMSEG 850 20.pdfSEG 850 20.dwgSEG 850 20.STP
SEG 950 20 00 CC LMSEG 950 20.pdfSEG 950 20.dwgSEG 950 20.STP
SEG 1050 20 00 CC LMSEG 1050 20.pdfSEG 1050 20.dwgSEG 1050 20.STP
SEG 1200 20 00 AA LMSEG 1200 20.pdfSEG 1200 20.dwgSEG 1200 20.STP

Associated Products

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01952 222300