FUN 20 Imperial Series
A pair of flange profile rings separated by a 3/4" ball set; a constant section height of 2.205" and a standard range of external diameters ranging from 20.39" to 47.17" to match American dimension and bolt standards
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.
While a flange reduces the overall weight of the bearing, it also reduces its torsional rigidity and these bearings are thus best suited to light or medium duty applications where there is not a high load eccentricity.
- 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
If the IMPERIAL sizes and bolt patterns are not quite right, consider the FUN20 Metric Series
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 reference||Outline dimensions & weight|
|FUN 518 20 61 CC LM||20.390||11.970||17.870||16.220||16.140||14.490||58|
|FUN 648 20 61 CC LM||25.510||17.090||22.990||21.340||21.260||19.610||76|
|FUN 748 20 61 CC LM||29.450||21.030||26.930||25.280||25.200||23.550||89|
|FUN 848 20 61 CC LM||33.390||24.970||30.870||29.220||29.140||27.490||104|
|FUN 948 20 61 CC LM||37.320||28.900||34.800||33.150||33.070||31.420||118|
|FUN 1048 20 61 CC LM||41.260||32.840||38.740||37.090||37.010||35.360||132|
|FUN 1198 20 61 CC LM||47.170||38.750||44.650||43.000||42.920||41.270||153|
|QCB reference||Outer holes||Inner holes|
|FUN 518 20 61 CC LM||19.250||8||13.130||12||1|
|FUN 648 20 61 CC LM||24.380||12||18.130||15||2|
|FUN 748 20 61 CC LM||28.380||12||22.130||18||3|
|FUN 848 20 61 CC LM||32.250||15||26.130||18||4|
|FUN 948 20 61 CC LM||36.250||18||30.000||18||5|
|FUN 1048 20 61 CC LM||40.130||18||34.000||20||6|
|FUN 1198 20 61 CC LM||46.000||18||39.880||24||7|
|Standard grease fitting||# at least 2x 1/4"-28 UNF 2B on inner and outer rings|
The FUN20 Imperial Series is interchangeable with bearings from other manufacturers such as Rotek, Kaydon, AVON, Silverthin . However there may be variations to this rule (e.g. OEM variants) and we invite you to refer to our technical staff for assistance.
|Basic QCB ref||Kaydon||Avon||Rotek||Silverthin|
|FUN 518 20 61 CC LM||RK6 16 P1Z||716 MC1||L6 16 P9Z||SK6 16 PZ|
|FUN 648 20 61 CC LM||RK6 22 P1Z||721 MC1||L6 22 P9Z||SK6 22 PZ|
|FUN 748 20 61 CC LM||RK6 25 P1Z||725 MC1||L6 25 P9Z||SK6 25 PZ|
|FUN 848 20 61 CC LM||RK6 29 P1Z||729 MC1||L6 29 P9Z||SK6 29 PZ|
|FUN 948 20 61 CC LM||RK6 33 P1Z||733 MC1||L6 33 P9Z||SK6 33 PZ|
|FUN 1048 20 61 CC LM||RK6 37 P1Z||737 MC1||L6 37 P9Z||SK6 37 PZ|
|FUN 1198 20 61 CC LM||RK6 43 P1Z||743 MC1||L6 43 P9Z||SK6 43 PZ|
- Double drilled or custom drilling patterns
- Higher precision bearings with location diameters
- Reduced internal clearance (Class 5 & Class 6)
- Black oxide (standad) or zinc plating (to order) for enhanced corrosion protection
- Epoxy paint or even Nylon coated units to special order
- Stainless steel or aluminium versions
FUN20 Imperial Series slewing rings are normally produced in 50Mn / C45.
Standard FUN20 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 FUN20 Imperial series is ungeared
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.FUN20 Imperial 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 10.9 bolts. The load point should be well under the relevant load curve for long life.
Grade 8.8 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!
|QCB reference||PDF print|
|FUN 518 20 61 CC LM||FUN 518 20 61.pdf|
|FUN 648 20 61 CC LM||FUN 648 20 61.pdf|
|FUN 748 20 61 CC LM||FUN 748 20 61.pdf|
|FUN 848 20 61 CC LM||FUN 848 20 61.pdf|
|FUN 948 20 61 CC LM||FUN 948 20 61.pdf|
|FUN 1048 20 61 CC LM||FUN 1048 20 61.pdf|
|FUN 1198 20 61 CC LM||FUN 1198 20 61.pdf|
The 3D models for these bearings are available from 3DContentCentral - search for "QCB FUN"
(PDF) 925.94 KB
Ensure an adequate supply of the correct grease to prolong slewring ring life
Economical semi-precision turntables of similar diameter.
Do you have a special project?
Need some advice? We can help!