Durobearing™ is the trademark used by Saver to identify its
self-lubricating composite bearings and represents a technologically advanced and reliable
solution for journal bearings.
Durobearing™ is composed of high-performance fibres and makes use of technology
and processes developed directly by Saver to attain a mass-produced product with superior
Self-lubricating composite bearings were developed in the 1950s and 1960s for outer space
applications. The functioning of spacecraft and satellites must be reliable and
In the 1990s major manufacturers begin using self-lubricating composite bearings, as they
learnt of their particular properties; Today, composite plain bearings are a standard
component for manufacturers of heavy industrial equipment and machines, agricultural
equipment, and pneumatic and hydraulic cylinders.
Self-lubricating composite bearings have increasingly taken the place of metal bearings
needing lubrication. Durobearing™ is ideal for high load, low speed applications or where
traditional lubrication is difficult, costly or harmful.
Some of the industry applications for Durobearing™ :
Aerospace and Defense
control systems (aircraft pivot linkages, flight controls, u-joints, door
systems, landing gear linkage, helicopter main and tail rotor assemblies,
missile launchers, loading ramps
irrigation equipment, tractors and attachments, combines
car wash machinery, suspension systems, lifting platforms and mechanical
parking systems, kingpin assemblies
Durobearing™ is filament-wound and impregnated with thermoset
This lightweight and efficient composite journal bearing features a Teflon™ liner (Teflon™
is a trademark of Du Pont de Nemour) and is characterized by a high load capability
well-suited to handling frequent starts and stops. Its self-lubricating properties enable
Durobearing™ accommodates rotary, oscillatory and sliding motions
and offers excellent reliability, including the following features and benefits:
Self-lubricating with dry lubrication
maintenance-free, eliminating the need for greasing systems
operational in inaccessible environments
appropriate for materials that must avoid contact with lubricant
reduced operating and warranty cost
significant reduction of “systems” cost of assembly
Dimensional and thermal stability, corrosion and chemical resistant
operates in submerged conditions
and hostile environments such as
sea water, detergents, alcohol and acids
copes with temperature extremes
permits a long shelf life
can be machined to suit precision engineering requirements (including
shaped bore designs) using conventional
operates with a variety of steel shaft materials
Advanced composites material
Teflon™ liner with extremely low coefficient
of friction (Teflon™ is a trademark of Du Pont de Nemour)
custom size available
low initial conversion cost
static and dynamic coefficients very
close, eliminating “stick-slip” behavior
low wear of mating parts (shaft and housing)
reduced power demand for start-up
and running of machinery
temperature kept within operation perimeters
Non-conductive and non-magnetic
can serve as insulating material
no galvanic reactions
Tight press fit and low running clearances
ease of installation—no need for retainers
low noise chatter
enhanced abrasion resistance
Our basic service starts with initial customer contact that
focuses on gaining an understanding of technical and business needs, along with environment
and operating conditions where the bearing will be in use.
SAVER is experienced at coordinating the functional and business requirements to provide our
composite bearings in a timely manner.
Our technical department is at the disposal of the customer in evaluating how to best
optimize all applications also proposing tailor-made solutions.
Saver’s collaboration with customers does not end with the installation of the bearing but
continues through a team working together with the customer to explore all possible further
SAVER has its own technological laboratories for testing, inspecting and improving the
product and its performance.
Specialized equipment is used to subject the composite bearings to endurance and wear tests.
The testing cycles may run in continuous rotation, in oscillation or in translation mode. We
go up to dynamic loads of 50,000 kg (110,230 lbs.) and continuously measure the following
parameters: Applied Load — Torque — Coefficient of Friction — Wear — Temperature.
The technology and equipment at our disposal enable us to realize
our Durobearing™ line according to customer requests and designs, not just in terms of
non-standard diameters, but also where special shapes and bore configurations are concerned,
flanged bearings on one or both sides
bearings with self-lubricating external surface
bearings with self-lubricating internal and external surface
circular bearings with hexagonal or square cut-outs
especially machined bearings (internal or external turning, boring, etc.)
bearings stamped by pad-printing
large-size bearings up to 1000 mm in diameter (39.37 in.)
To complete the range of bearings for different mechanical
solutions, we have developed a series of spherical self-lubricating composite bearings with
a steel ball joint inserted in the composite material lining.
Using proprietary technology and the best inside liner, Saver has developed an articulated
bearing with exceptional properties:
low coefficient of friction
low clearance between the spherical steel portion and the composite
highly wear resistant
able to handle high loads
may be used for continuous oscillatory and rotary motion
Durobearing™ ENGINEERING DATA
Ultimate Compression Strength
Maximum Static Load
Maximum Dynamic Load (P)
Maximum Pressure & Velocity (PV)
7.5 KN/cm2 m/min
35,000 psi ft/min
-190 °C to +170 °C
-320 °F to +350 °F
Specific Gravity (Density)
Coefficient of Friction
Maximum recommended length
twice the internal diameter
Minimum recommended length
half the internal diameter
Recommended Shaft Characteristics for Optimal Performance:
Durobearing™ has a special liner, giving it exceptional resistance to wear.
Even after hundreds of thousands of cycles (with no lubricant) the condition of the bearing
and shaft are still efficient.
The chart below shows loss of thickness according to number of cycles.
Durobearing™ contains a Teflon™ liner which offers the lowest coefficients of
friction of any known fibre.
Furthermore, the static coefficient of friction is hardly greater than the dynamic one, thus
eliminating the phenomenon of stick-slip (see Engineering Data).
With the elimination of stick-slip, Durobearing™ allows for a reduction in
vibrations and the break-away torque needed to set the shaft in motion, translating into an
overall improvement in precision running.
Durobearing™ offers very high performance with specific materials that provide
exceptional characteristics —structural robustness of the composite and a minimum
coefficient of friction.
It is worth noting that the coefficient of friction is lowered to a level of 0.01 with an
increase in the applied load and/or temperature, as illustrated in the chart.