Technical Info | Lubrication

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Lubrication (continued) ____________________________________________________________________________

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LUBRICANT SHELF LIFE

Lubricants will lose their effectiveness over time, therefore all lubricants will have a finite shelf life, and this information, together with date of manufacture, must be controlled in order to assure expected lubricant performance. All SWC bearings are supplied containing lubricants that are within shelf life.

SPEED LIMITATION (LUBRICANT FACTOR)

For bearings with low-viscosity petroleum oil lubricant, the maximum operating speed is dictated by cage type and material, and centrifugal ball loads. In this ideal case the maximum operating inner ring rotation speed is given from the speed factor dN, where dN is the product of the bearing bore (d mm) times the maximum speed (N RPM). Depending on bearing design, dN can have values up to 600,000.

The maximum inner ring rotation speed with petroleum oil lubricant, N_max RPM, is given for each bearing size in the individual bearing tables of this catalog. This value must be reduced by a lubricant factor f_n to obtain the actual maximum inner ring operating speed of a bearing with a particular grease lubricant.

N_actual = N_max • f_n (See bearing tables for individual N_max values)

Values of the lubricant factor f_n are given in the grease lubricant charts on the next page.

In the case of outer ring rotation, maximum speeds are reduced by approximately 20%. For more specific information on maximum bearing speeds in different applications, contact SWC.

LUBRICANT CHARTS

OIL LUBRICANTS

SWC LUBRICANT CODE	MANUFACTURER TRADE NAME	BASIC TYPE	WORKING TEMP	VISCOSITY Cs	CHARACTERISTICS
AF2	SHELL OIL AEROSHELL 12	Diester	-65 to 250 ^oF (-54 to 121 ^oC)	89 @ 130 ^oF	Light general purpose oil (MIL-L-6085C)
WL2	Fuchs Lubricant Co. Windsor Lube L-245X	Diester	-65 to 250 ^oF (-54 to 121 ^oC)	31 @ 100 ^oF	Light general purpose oil (MIL-L-6085C)
SW16	NSK SW16 Plating Oil	Ester	-40 to 265 ^oF (-40 to 130 ^oC)	90 @ 100 ^oF	Low SVP*, low torque, grease replacement
KC1	Dupont Krytox 143AC	Fluorocarbon	-30 to 550 ^oF (-34 to 288 ^oC)	270 @ 100 ^oF	High temperature, very low SVP*

* SVP = Saturated Vapor Pressure

Note: Where grease is not suitable for a given application (e.g. for low torque), then a MIL-L-6085C oil lubricant is an industry standard. (If no lubricant specification is given by the user then SWC bearings are normally supplied with AF2 lubricant, above.) Other oil lubricants are only to be used in specialized applications and may have limited availability or be expensive. Contact SWC for more information on available oil lubricants.

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