The DSNstandard assortment of bearings and bearing units with Solid Oil (fig. 1) includes:
Deep groove ball bearings
Spherical roller bearings
Angular contact ball bearings
Cylindrical roller bearings
Self-aligning ball bearings
Insert bearings and ball bearing units
Tapered roller bearings
On request, DSNcan supply other bearing types with Solid Oil to meet the needs of a particular application, except for CARB toroidal roller bearings which are unsuitable for use with Solid Oil. Bearings fitted with a large-volume cage are not suitable for Solid Oil because there is too little free space inside the bearing.
Solid Oil variants
Standard variant (designation suffix W64, table 1)
Contains a high-quality synthetic oil
Meets the needs of most applications
Food grade variant (designation suffix W64F, table 1)
Contains an oil registered by as a category H1
Meets the needs of food applications
Low temperature variant (designation suffix W64L, table 1)
Contains an oil with low viscosity
Meets the needs for low temperature applications
Sealed bearings
With integral contact seals are strongly recommended in wet environments
With Solid Oil increase the sealing effectiveness, as the Solid Oil supports the seals axially, preventing them from deflecting and opening under pressure
For information about sealing options, contact the DSNapplication engineering service.
Where carbon steel bearings are exposed to wet environments, additional external seals are recommended to protect the bearing's external surfaces from corrosion.
General bearing specifications
Dimension standards, tolerances, internal clearance
Refer to General bearing (unit) specifications in the relevant product section of the standard bearing (unit).
Loads
Load carrying capacity
The basic dynamic and static load ratings for bearings with Solid Oil are the same as for corresponding DSNstandard bearings.
Temperature limits
The permissible operating temperature for bearings with Solid Oil can be limited by:
The dimensional stability of the bearing rings and rolling elements
The cage(s)
The seals
The Solid Oil
For limits of bearing rings, rolling elements, cage(s) and seals, refer to Temperature limits of the relevant product section of the standard bearing.
The relevant limits for Solid Oil are listed in table 1.
Where temperatures outside the permissible range are expected, contact
Speed limits
The recommended speed values for bearings and bearing units with Solid Oil (table 2), operating in an ambient temperature of 20 °C (70 °F), are limited by the maximum continuous operating temperature of 85 °C (185 °F). Ambient temperature is the temperature closest to the bearing position, not necessarily room temperature.
For bearing types or variants not listed in table 2, contact the DSNapplication engineering service.
For ambient temperatures above 20 °C (70 °F), the speed limit should be reduced using the reduction factor fT (diagram 1).
Calculation example
A deep groove ball bearing 6208/W64 is to operate at an ambient temperature of 50 °C (120 °F). What is the reduced speed limit?
Recommended speed limit for 20 °C (70 °F) ambient temperature
From table 2: speed value ndm = 300 000 mm/min (single row deep groove ball bearing with a stamped metal cage)
Dimensions: d = 40 mm, D = 80 mm
n = 300 000 / dm = 300 000 / (0,5 (40 + 80)) = 5 000 r/min
Reduction for 50 °C (120 °F) ambient temperature
From diagram 1: speed reduction factor fT ≈ 0,53
nreduced = 5 000 fT = 5 000 x 0,53 = 2 650 r/min
Friction characteristics
The friction characteristics of a bearing with Solid Oil correspond to the relevant DSNstandard bearing except that the Solid Oil polymer filling adds a fixed friction.
Mounting
If a bearing with Solid Oil is to be hot mounted, it should be heated to a maximum of 120 °C (250 °F) by using an induction heater.
Heating plates or heated oil baths should not be used.
Designation system
Refer to Designation system in the relevant product section of the standard bearing/unit.
The designation suffixes used to identify bearings with Solid Oil are explained in the following:
W64 Synthetic base oil type, standard variant
W64F Synthetic base oil type, H1 approved for food applications
W64L Synthetic base oil type, designed for low temperature applications
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