SKF - Rolling Bearings

Designation system
Designs and variants
The most commonly used NoWear coated
bearings have only the rolling elements coated
(designation suffix L5DA). They are recommended
for applications where the bearing
load is light to normal, or where vibration and
oscillating movements occur.
NoWear coated bearings that have the inner
ring raceway(s) and rolling elements coated
(designation suffix L7DA) are recommended
for any of the following operating conditions:
• abrasive contaminants that can cause premature
wear
• heavy loads
• unusual lubrication conditions such as bearings
lubricated by the process media
Most SKF rolling bearings can be supplied as
NoWear coated bearings († table 1). For
variants not listed in table 1, contact the SKF
application engineering service.
Cages
Refer to Cages in the relevant product chapter
of the standard bearing.
Bearing data
Dimension standards, tolerances,
internal clearance, misalignment,
defect frequencies
Refer to Bearing data in the relevant product
chapter of the standard bearing.
Loads
Minimum load
Due to the material combination of NoWear/
steel in the contact area, the risk of smearing
damage is reduced. NoWear coated bearings
are recommended for applications with light
loads in combination with high speeds.
Load carrying capacity, equivalent
loads
Refer to Loads in the relevant product chapter
of the standard bearing.
Temperature limits
The NoWear coating withstands temperatures
of up to 350 °C (660 °F). For temperature limits
of the bearing, refer to Temperature limits in
the relevant product chapter of the standard
bearing.
Permissible speed
Refer to Permissible speed in the relevant
product chapter of the standard bearing.
Lubrication
In general, the same lubrication guidelines are
valid for NoWear coated bearings as for standard
bearings († Lubrication, page 239). However,
NoWear coated bearings can operate
reliably even when adequate surface separation
cannot be achieved by the lubricant (k < 1).
NoWear can prevent direct metal-to-metal
contact between the rolling elements and
raceways. It might be possible to reduce the
need for EP and AW additives in the lubricant
when using a NoWear coated bearing, as the
coating already acts as a powerful additive.
Designation system
Refer to Designation system in the relevant
product chapter of the standard bearing.
The designation suffixes used to identify
NoWear coated bearings are explained in the
following.
L5DA Coated rolling elements
L7DA Coated rolling elements and inner ring
raceway(s)
15G
1245