Lubricants

For long term performance ball bearings must have some form of lubrication. Grease and oil is recommended whenever the application will allow it.

Generally grease is selected for low to medium speed applications and oil is selected for high speed applications.

Special environments such as vacuum, high and low temperatures may not allow conventional lubrication. In some applications the addition of grease or oil could contaminate a product. Many specialty lubrications are available to satisfy specific operating conditions.

For low speed low load applications or for when cleanliness and vacuum call for it a solid dry film lubricant coating such as Tungsten Disulfide or Moly Disulfide is a viable option.

Many specialty lubrications are available to satisfy specific operating conditions those listed below are our most common and are for comparison purposes only. There is no perfect lubrication and for specialty applications selection is made on a case by case basis. Data sheets should be analyzed for suitability.

MFG BRAND SPEED CAPABILITY OPERATING TEMPERATURE
CHEVRON SRI LOW TO HIGH -20 F to 305 F
EXXON POLYREX-EM LOW TO HIGH -20 F to 350 F
DUPONT KRYTOX LOW TO MED -50 F to 600 F
CASTROL BRAYCOTE 601 LOW TO HIGH -112 F to 400 F
KLUBER ISOFLEX NB52 LOW TO HIGH -58 F to 302F

DATA SHEETS

MSDS SHEETS

SOLID LUBRICANTS

Solid lubricants offer excellent lubrication under extreme conditions.

When conditions exceed the limitations of wet lubricants as is found in high temperature vacuum applications, a dry solid lubricant coating can provide the boundary between rolling element and raceway reducing stress and increasing life.

These coatings are most beneficial to all steel bearings running dry where the boundary created by the coating can reduce micro-welding. For hybrid type bearings coatings can add additional life for critical applications.

Properties Tungsten Disulfide (WS2) Molybdenum Disulfide (MoS2)
Color Silver Gray Blue-Silver Gray
Appearance Crystalline Solid Crystalline Solid
Melting Point (º C) 1250º C 1185º C
Adhesion Mechanical-molecular interlock
Density 7.4 grams/cc 5.0 grams/cc
Molecular Weight 248 160
Coefficient of Friction 0.03 – inclined plane technique 0.03 – inclined plane technique
Thermal Stability in Air COF <0.1 till 1100ºF (594ºC) COF <0.1 @600ºF (316ºC) increases to 0.5 @1100ºF (594ºC)
Thermal Stability in Argon COF <0.1 till 1500ºF (815ºC) COF increases rapidly starting @800ºF (426ºC)
COF >0.1 @900ºF (482ºC)
Load Bearing Ability Same as substrate to 350,000 PSI to 250,000 PSI
Lubrication Temperature Range Ambient: from -273ºC to 650ºC Vacuum(10-14 Torr): from -188ºC to 1316ºC Ambient: from -185ºC to 350ºC Vacuum: from -185ºC to 1100ºC
Chemical Stability Inert, non-Toxic Inert, non-Toxic
Magnetism Non-Magnetic Non-Magnetic
Electrical Properties Has Semiconductor properties
Rockwell Hardness 30HRc
Coating Film Thickness 0.5 micron 0.5 micron
Corrosion Resistance Minor delay, will not inhibit Minor delay, will not inhibit