The importance of lubricant on bearing torque

Rolling element bearings, such as ball bearing and roller bearings, support the load required to carry out a machine’s function at a much lower friction than a fluid bearing alternative. This reduces the power required to drive the equipment, lowering the cost of moving the load and the energy required to operate the equipment.
Bearing torque is the force required to overcome internal friction to start or maintain rotation of the bearing. This frictional torque is generally increased with a larger bearing, increased load or increased lubricant drag.

How can we get the right bearing torque?
Many applications require the bearing to spin easily with extremely low frictional torque, without generating excess heat. Dry lubricant is one way of meeting these low torque requirements. Despite being solid, dry lubricants can reduce friction between two surfaces without the need for oil or grease.
Instrument oils are another option for low torque requirements. They will often produce very low torque levels especially at very low speeds.

There are many oils and greases to choose from, and there are other factors to consider aside from torque, such as contamination, speed or corrosion resistance. With the right lubrication type, correct fill level and consideration of load, you’ll be able to source bearings with the correct frictional torque for the specific application.