SKF - Rolling Bearings

15G NoWear coated bearings
NoWear coating
Fig. 1
NoWear is a wear-resistant carbon coating
that can be applied to the rolling elements and
inner ring raceway(s) of a bearing (designation
suffix L7DA) or only the rolling elements (designation
suffix L5DA) († fig. 1). A physical
vapour deposition process applies the wearresistant
carbon coating ranging from 1 to 3 µm
depending on the size of the bearing. The
hardness of the coating is 1 200 HV10.
NoWear coated bearing surfaces retain the
toughness of the underlying material while
adopting the hardness, improved friction
properties and wear-resistance of the coating.
During the running-in period, minute
amounts of the coating material are transferred
to the counter surfaces. This transfer
reduces friction and improves resistance
against wear and smearing, even in bearings
where only the rolling elements are coated.
L5DA
NoWear coated bearings are designed to
extend service life, relubrication intervals and
to withstand severe operating conditions
including:
More information
Bearing life and load ratings ...... 63
Design considerations ........... 159
Bearing systems ................. 160
Recommended fits ............... 169
Abutment and fillet dimensions ..... 208
• increased risk of smearing
• insufficient lubricating film for undisturbed
bearing operation (k < 1)
• sudden load variations
• light loads
• rapid speed changes
• vibration and oscillations
• high operating temperatures
Lubrication .................... 239
Mounting, dismounting and
bearing care ................... 271
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