TURNING IDEAS INTO ENGINEERED SOLUTIONS
Large Bearing
Design Manual and
Product Selection Guide
www.kaydonbearings.com
2 |www.kaydonbearings.com 1-800-514-3066
Table of Contents
Page Number
Section 1 — Introduction ........................................................................................................2
• Capabilities
• Design Features
• Preliminary Selection Guide
• Application and Load Analysis
• Typical Mountings
Section 2 — Stock Turntable Bearings ...................................................................................12
• MT-Series Bearings Selection Tables and Load Ratings
• RK-Series Bearings Selection Tables and Load Ratings
Section 3 — Other Products ...................................................................................................16
• Custom Four-Point Contact Ball Bearings
• Eight-Point Contact Ball Bearings
• WireX® Roller Bearings
• KH-Series Pre-engineered High Precision Bearing Assemblies
• Custom Bearing Capabilities
Section 4 — Load Rating Charts .............................................................................................23
• Load Rating Charts MT-Series, RK-Series, 4-Point Contact, 8-Point Contact
Section 5 — Installation and Maintenance .............................................................................25
• Installation and Care of Kaydon Bearings
• Design Considerations (for the equipment designer)
• Installation Instructions (for the equipment builder)
• Maintenance Instructions (for the equipment user)
Section 6 — Appendix and Sales Information ........................................................................32
• Application Data Form
• Warranty Information
• Engineering Design Aids and Technical Literature
Large Bearing Catalog 390 ©KAYDON® Corporation 2004
1-800-514-3066 www.kaydonbearings.com|3
Introduction
Kaydon Capabilities
Kaydon has been America’s leading pro-
ducer of large diameter custom bearings
since its founding in 1941. Manufactur-
ing operations have expanded steadily
to meet ever growing market needs since
1976.
Kaydon manufactures bearings up to
180 inches outside diameter using the
most modern facilities and equipment
in the industry. Continuing expansion
and manufacturing versatility have led to
our position as the leading supplier of all
types of large diameter combination load
bearings. Kaydon is unique in the breadth
of product capabilities offered, always
striving to match the best bearing type
with your application needs.
Standard bearings
Kaydon’s long history of serving the
needs of equipment and manufacturers
has resulted in two series of standard
bearings to fi t many common application
needs. The RK-Series of lightweight
turntable bearings have proven capable
of satisfying many requirements at mod-
erate cost—with the advantages of short
lead time or stock availability. The new,
expanded MT-Series of standard turnta-
ble bearings combine quick delivery with
maximum capacity and value to fi t an
even wider variety of applications. Many
other bearings shown in this catalog are
produced on a regular basis and offer
short lead time at moderate cost.
Custom bearings
While other manufacturers may special-
ize in one or two specifi c bearing types,
Kaydon’s broad experience and capabili-
ties allow us to match the product to
your requirements—not ours. Where
a special need exists, Kaydon can fi ll it
without sacrifi cing system performance.
Often, we can supply bearings which
fi ll the need with minimal alteration or
additional costs to the design. For truly
unique applications, our fully staffed
engineering department can design the
optimum solution.
Bearing types
• Four-point contact ball bearings, as
well as Kaydon’s patented 8-point
contact ball bearings, are used as swing
bearings in cranes, excavators, aerial
platforms and other types of construc-
tion and material handling equipment.
These bearings have also been applied
successfully in machine tools, radar
and medical equipment.
• Biangular roller bearings are used in
applications demanding higher preci-
sion and stiffness but requiring less
static load capacity, such as index
tables, positioners, antenna mounts
and military gun turrets.
• Inserted raceway–WireX®–bearings
with single, double or triple rows offer
important weight savings advantages
and are found in high performance
applications such as military vehicle
turrets.
• Plastic ball 4-point contact and
angular contact thrust bearings are
also available for specialized
applications.
Total capabilities
Kaydon offers the bearings to fi t your
needs. Ball and roller types in single and
multi-row designs. Solid or inserted wire
raceways. Geared raceways, both inter-
nal and external. Bearings for radial,
thrust, moment and combined loading.
Capacities, materials, seals and confi gu-
rations to fi t a variety of applications.
And the design and application engi-
neering service that has tailored the best
bearing values to the world’s toughest
bearing applications.
If you don’t see what you want in this
catalog, call us at (231) 755-3741. We
will be glad to supply technical assis-
tance, lead time information and quota-
tions on bearings to fi ll your requirements
or specifi cations.
Precision
Many devices, such as machine tool
tables and radar antennas, require a
high degree of accuracy and are de-
pendent upon the bearings to achieve
it. A single four-point contact ball or
biangular roller bearing is ideal for
these applications. Integral gears and
mounting holes reduce the number of
components and tolerance buildup,
resulting in maximum accuracy and
simplifi cation of design. Early consul-
tation with Kaydon can be invaluable
in determining the optimum bearing
and mounting.
The bearings listed in this catalog are
manufactured to a standard precision
suitable for many commercial applica-
tions, but Kaydon also manufactures
bearings of higher precision. The
engineering principles discussed in the
manual also apply to bearings of any
precision level.
Bearings with radial and axial runouts
of less than .0002 inches T.I.R. and
gears of AGMA Class #10 or better
can be furnished. Where extreme
rigidity is required, very high spring
rates can be maintained. Kaydon
achieves these results through the
use of modern precision equipment,
experienced personnel, and specially
developed manufacturing techniques.
Combined with other features of large
diameter bearings—high load capacity,
small space requirement, large center
hole, grease lubrication, and ease of
installation, high precision and rigid-
ity make possible greatly improved
performance in such applications as:
• Grinding machines
• Turning and boring machines
• Index tables
• Scientifi c and medical instruments
• Radar, height fi nders, positioners
and gun directors
• Ocular and radio telescopes
• Logging machinery
• Material handling equipment
©KAYDON® Corporation 2004 Large Bearing Catalog 390
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Bearing Design Features
Whether used in heavy-duty off-road
vehicles, precision medical equipment or
high accuracy military radars, large diam-
eter Kaydon bearings share many design
features. There are important differences
however, which often dictate the optimal
bearing selection for a given application.
These pages outline the primary features
of each bearing type.
Turntable bearing advantages
Over the years demands have increased
for equipment economy, performance,
and reliability. As a result, four-point
and eight-point contact ball bearings
have replaced the older, less effi cient
hook rollers and kingpost assemblies.
Turntable bearings provide smooth rota-
tion and high radial, thrust and moment
load capacity in a compact dimensional
envelope. With a Kaydon turntable bear-
ing there is no need for a center shaft or
kingpost, so the bearing center space is
open and available for hydraulic piping
or conduit runs.
Additionally, turntable bearings in-
cor-porate many special features such
as integral gearing, through-drilled or
tapped mounting holes and contact seals.
These features simplify the job of the
equipment designer, lower manufacturing
costs, and facilitate system maintenance.
Importance of proper selec-
tion, installation and use
Turntable bearing applications are typi-
fi ed by heavy loading and slow, intermit-
tent or partial rotation.
Bearing failure is therefore seldom due to
classic rolling contact fatigue. In other
words, calculated bearing life is not usu-
ally a major consideration in turntable
applications, especially in construction
equipment.
Turntable bearings are usually selected
on the basis of static load capacity, suit-
able integral gearing, and other special
features. Turntable bearing failure is
often the result of practical consider-
ations not covered by classical rolling
bearing theory—such as nonuniform
support structure design, lack of lubrica-
tion, improper selection or application
of fasteners, overloading beyond equip-
ment specifi cations, and other abuses.
The purpose of this manual is to provide
guidelines for system design and turn-
table bearing application, and to caution
equipment designers and users of one
principle: Large-diameter bearings are
not commodity products. Each bearing is
a custom design or a custom application
of an existing bearing design. In either
case, the bearing manufacturer should be
involved in the design stage.
Four-point contact ball bearings
Four-point contact ball bearings can
accept combinations of radial, thrust and
moment loads. This is possible due to
the unusual geometry of the raceways (or
ball grooves). The ball groove in each
race has two radii that are larger than
the ball radius. The centers of these two
radii are offset from the center of the ball
radius. This results in a “Gothic Arch”
confi guration in each of the raceway
grooves, making it possible for the two
grooves to contact the ball at four points.
High thrust and moment capacity is ob-
tained in a four-point contact ball bear-
ing by its deep raceway grooves. These
allow high initial contact angles between
the balls and raceways and increase the
thrust and moment capacity. The deep
grooves also accommodate the contact
angle increase which results from ring
stretch and ball defl ection under load.
Precision grinding of raceways is nec-
essary to control accuracy of contact
angles, close ball to raceway conformity,
diametral clearance and raceway fi nish.
These design features, along with proper
material selection, assure the proper
function of the four-point contact ball
bearing.
Eight-point contact
ball bearings
The eight-point contact ball bearing was
developed by Kaydon to satisfy require-
ments for maximum load capacity within
a given envelope, especially in larger size
bearings.
As shown below the eight-point contact
ball bearing is an annular bearing with
two rows of balls. The unique feature of
this bearing lies in the utilization of the
“Gothic Arch” or four-point contact
internal geometry in both rows.
Functionally, the bearing may be con-
sidered to be two single row, four-point
contact bearings with adjacent faces.
The four points of contact permit each
row of balls to accept radial, axial, or
moment loads, or a combination of the
three. Through precise grinding tech-
niques, raceways are closely matched for
parallelism and size, providing a high
degree of load sharing between rows. Test
results have confi rmed that the second
row of balls provides and additional 80%
capacity over that provided by a single
row.
Biangular roller bearings
Biangular roller (cross roller) bearings
will support the same types of load as
the four-point and eight-point contact
ball bearings.
4 |www.kaydonbearings.com 1-800-514-3066
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To accomplish this universal load carry-
ing capability, the bearing is designed
with V-groove raceways, providing two
roller paths in each ring. The rollers
have a length slightly less than their
diameter and are positioned so that
adjacent rollers contact different sets of
raceways, with the axes at right angles
to each other. Positioned in this manner
the rollers transmit load along perpen-
dicular sets of 45° contacts. The action
of the bearing under various types of
loading is thus analogous to that of the
four-point contact ball bearing.
While a roller of length and diameter
approximating a given diameter of ball
has more load carrying capacity, the
static thrust and moment capacity of
a biangular roller bearing is less than
that of a four-point contact ball bear-
ing of comparable size. The reason for
this is that only alternate rollers resist a
uni-directional axial load. In some cases,
capacity in one axial direction may be
increased by orienting more rollers along
one axis than the other, with a resulting
decrease in capacity in the opposite
direction.
The main advantages of biangular roller
bearings are greater stiffness and conse-
quent superior spring rate, as well as
tolerance of mounting surface irregu-
larities and resulting defl ections. When
defl ection under load must be minimized,
or when bearing turning torque is criti-
cal this bearing may be given preference
over a four-point contact ball bearing.
WireX® inserted raceway
bearings
WireX® bearings are generally used in
applications requiring maximum weight
reduction and corrosion resistance. They
are generally custom designed to support
specifi c combinations of radial, thrust
and moment loads. Gear teeth can be cut
in the inner or outer ring, and bolt holes
provided for mounting.
The bearing rings have machined seats
to position the inserted wire raceways,
which are held in place by bearing loads
transmitted through the rolling elements.
The rolling elements (usually rollers) and
wires are usually made of stainless steel.
Bearing rings can be made of many dif-
ferent materials. When aluminum is used
the complete bearing can be made of cor-
rosion resistant material and may result
in weight savings of up to 50%. The use
of aluminum rings may also eliminate
thermal expansion problems when the
bearing is mounted to aluminum struc-
tures.
Another advantage of WireX® bearings
is their high tolerance of non-rigid and
out-of-fl at mounting structures. Irregu-
larities can be accommodated by the free
movement of the wire inserts in their
circular seats.
WireX® bearings can often be rebuilt—
a substantial savings when compared to
complete bearing replacement.
Three-row roller bearings
Three-row roller bearings offer the high-
est capacity, using three separate rows of
rollers. The top and bottom rows absorb
thrust loading, each row in the opposite
direction, and operate together to handle
moment loading. The intermediate row
handles radial loads. Because each row is
independent, frictional torque is low.
Plastic ball bearings
Large diameter bearings with plastic
balls are provided for light duty, low load
applications. Raceways are V-grooves
machined in aluminum or steel bearing
rings.
These bearings tolerate mounting distor-
tions well, operate with low torque, and
are relatively inexpensive. They are ca-
pable of handling radial, thrust and mo-
ment loads. Trade-offs include reduced
load capacity and positional accuracy.
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Bearing Overview Selection Guide
Maximum Capacity
General Typical Rolling Outside Gear
Moment Thrust Radial
Typical
Description Cross Section Element Diameter Options
(ft.-lbs.) (lbs.) (lbs.)
Applications
Four-Point Machine Tools
Contact Ball Aerial Devices
Medical Equipment
Custom
10,000,000 6,000,000 1,300,000
Radar
(pg. 16-17) 16" to 180" •Non- Cranes
Ball geared Utility Cranes
MT-Series •Internal
900,000 600,000 200,000
Excavators
(pg. 12-13) 12" to 48" •External
RK-Series
140,000 175,000 60,000 (pg.14-15) 20" to 47"
Lightweight •Non- Military Turrets
Four-Point Geared Medical Equipment
Contact
Plastic
To 60" •Internal Consult Kaydon General Purpose
(pg. 22)
Ball
•External
Eight-Point Large Cranes
Contact Excavators
(pg. 18-19) •Internal Marine Cranes
Ball To 180" •External 15,000,000 9,000,000 2,000,000 Severe Environment
KH Series •Non- Precision Indexing
Precision Geared Rotary Tabes
Bearing Ball 20" to 32" 40,000 43,000 20,000
Assemblies •External
(pg. 20-21)
Customization
Most of the bearing designs shown
on these pages can be produced with
user-defi ned options, including but not
limited to special paints and platings,
low temperature stabilization and special
cages for high speed and horizontal
mountings.
Precision
Precision gears, runouts, preloads and
torque control are available to suit spe-
cifi c applications. AGMA Class 6 gears
are standard, gears up to AGMA Class
12 can be supplied on request.
6 |www.kaydonbearings.com 1-800-514-3066
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Maximum Capacity
General Typical Rolling Outside Gear
Moment Thrust Radial
Typical
Description Cross Section Element Diameter Options
(ft.-lbs.) (lbs.) (lbs.)
Applications
Biangular
Roller
(pg. 22) •Internal
Radar
Roller To 180"
•External
7,000,000 3,000,000 1,400,000
Military turrets
Machine tools
Excavators
Lightweight
Biangular
Roller •Internal
(pg. 22) Roller To 180"
•External
2,500,000 1,250,000 575,000 Military turrets
Three-Row
Roller Radar
(pg. 22) •Internal Cranes
Roller To 180"
•External
18,000,000 12,000,000 4,000,000 Excavators
Stackers & reclaimers
Heavy mill equipment
Inserted
Race •Non-
WireX® Geared
(pg. 18-19) Roller To 120" •Internal
1,820,000 1,000,000 370,000
Military turrets
•External
Radar
Inserted
Race
Biangular •Internal
WireX® Roller To 120"
•External
1,830,000 900,000 370,000
Military turrets
(pg. 22)
Radar
Inserted
Race
Three-Row •Internal
WireX® Roller To 120"
•External
2,250,000 1,125,000 400,000
Military turrets
(pg. 18-19)
Radar
Special
Confi guration
(pg. 22)
Ball To 180"
Consult Kaydon for design and application
engineering assistance with your specifi c
custom bearing requirements.
1-800-514-3066 www.kaydonbearings.com|7
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Application and Load Analysis
★See warranty, page 33.
Many factors must be considered in
selecting and applying an antifriction
bearing. Chief among these are type and
magnitude of loading, speed of rotation,
and accuracy.
For most applications in construction and
material handling equipment, load is the
primary concern. Speed and accuracy are
relatively unimportant but deserve
consideration along with other items such
as friction torque, gearing, and mounting.
Other applications, such as precision
medical equipment, require a high degree
of accuracy and close control of torque,
but have relatively low loading.
Load
Because a turntable bearing accepts all
types of loading,
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