Tool steel
Grey cast iron
Copper
Aluminium
In Grey cast iron materials no cutting oil is used when drilling.
Cutting oil
Grease
Lard oil
Kerosene oil
when cutting steel with hand hacksaw, cutting oil is used .
Carry away the heat produced in bearing
Prevent metal-to-metal contact and reduce friction
Prevent entry of foreign material i.e dust, dirt etc. in the bearing
Provide a cushion to a load and shocks
No change in viscosity due to variation in temperature
Reduces friction between machine parts
Takes up the surface pressure between sliding parts
Becomes thicker after prolonged use
Viscosity
Specific gravity
Specific heat
Emulsification
The most important quality of any lubricant is Viscosity.