FIG 20 Imperial Series

A flange profile outer and a geared inner ring separated by a 3/4″ ball set; a constant section height of 2.025″ and a standard range of external diameters ranging from 20.39″ to 47.17″ matching American dimension, gearing and bolt patterns.

Compared with traditional combination bearing and gearing systems, slewing rings provide a sealed bearing to accommodate axial, radial and moment loads while simultaneously providing a gear for power trasmission as well as bolt holes for fixation.

Key Features

A reduction in the number of design elements
Less component machining
Quick and easy assembly of machinery
Weight savings

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Product Overview

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 material properties and all stages of production to packing and labelling.

Applications 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.

If the IMPERIAL sizes and bolt patterns are not quite right, consider the FIG20 Metric series

What are the Typical Uses for Slewing Rings?

Cranes and crane handling systems
Man lifts and access platforms
Bottling and packing line carousels
Robotics and positioning systems
Solar tracking systems
Wind turbines
Winches
Water treatment plants
Machine tools

Dimensions

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QCB reference	Outline dimensions & weight
	D_a	D_i	B	U	C	Load curve		Weight
	in	in	in	in	in	Load curve		lbs

FIG 518 20 61 AA LM	20.390	12.850	17.870	16.220	16.140	1		65
FIG 648 20 61 AA LM	25.510	17.600	22.990	21.340	21.260	2		90
FIG 748 20 61 AA LM	29.450	21.600	26.930	25.280	25.200	3		106
FIG 848 20 61 AA LM	33.390	25.600	30.870	29.220	29.140	4		121
FIG 948 20 61 AA LM	37.320	29.133	34.800	33.150	33.070	5		148
FIG 1048 20 61 AA LM	41.260	33.133	38.740	37.090	37.010	6		165
FIG 1198 20 61 AA LM	47.170	39.133	44.650	43.000	42.920	7		188

QCB reference	Outer holes		Inner holes		20^o spur gear
	L_a	n_a	L_i	n_i	P	DP	z	F_{z MAX}
	in							lb.f

FIG 518 20 61 AA LM	19.250	8	14.880	12	13.250	4	53	7883
FIG 648 20 61 AA LM	24.380	10	19.630	15	18.000	4	72	7883
FIG 748 20 61 AA LM	28.380	12	23.630	18	22.000	4	88	7883
FIG 848 20 61 AA LM	32.250	15	27.630	18	26.000	4	104	7883
FIG 948 20 61 AA LM	36.250	18	31.500	18	29.667	3	89	10500
FIG 1048 20 61 AA LM	40.130	18	35.500	20	33.667	3	101	10500
FIG 1198 20 61 AA LM	46.000	18	41.500	24	39.667	3	119	10500

Standard grease fitting	# at least 2x 1/4″-28 UNF 2B on outer ring

Interchange information

The FIG20 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.

FIG 518 20 61 AA LM	RK6-16N1Z	L6-16N9Z	SK6 16 NZ	716 MB1
FIG 648 20 61 AA LM	RK6-22N1Z	L6-22N9Z	SK6 22 NZ	721 MB1
FIG 748 20 61 AA LM	RK6-25N1Z	L6-25N9Z	SK6 25 NZ	725 MB1
FIG 848 20 61 AA LM	RK6-29N1Z	L6-29N9Z	SK6 29 NZ	729 MB1
FIG 948 20 61 AA LM	RK6-33N1Z	L6-33N9Z	SK6 33 NZ	733 MB1
FIG 1048 20 61 AA LM	RK6-37N1Z	L6-37N9Z	SK6 37 NZ	737 MB1
FIG 1198 20 61 AA LM	RK6-43N1Z	L6-43N9Z	SK6 43 NZ	742 MB1

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Technical

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

Materials

All geared slewing rings are manufactured in 42CrMo4 V steel to offer superior gear strength over some other brands.

Internal construction

Standard FIG20 Imperial 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.

Seals

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

Gearing

The FIG20 Imperial Series has a standard 20° pressure angle, uncorrected spur gear cut into the inner ring.

Lubrication

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. FIG20 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!

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Downloads

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.

Applications

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 FIG20 Metric series.

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.

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Enquire Now About FIG 20 Imperial Series

For any enquiries regarding FIG 20 Imperial Series, please complete our enquiry form, and a member of our technical team will respond promptly. Alternatively, you can reach out directly to one of our offices using the contact details here. Our specialists are ready to provide guidance and support tailored to your machinery and engineering needs.