The Importance of Seals (Explainer)


Seals protect the bearings to insure a longer life and less required maintenance. Working conditions dictate when seals must be part of the design. For example, bi-pedal motion on humanoids that work in warehouses are exposed to dirt and dust.

What Seals Do for Bearings

  • Seals prevent ingress of contaminants such as dirt, dust, water and abrasive particles.
  • Prevent the egress of grease.
  • Protect bearings in harsh working environments.

Seal Impact on Torque

The benefits of seals far outweigh their affect on torque, but it is important to be aware of the impact. CCTY makes custom seals with low contact between the seal lip and the ball surface. This ensures good sealing performance while maintaining low torque.

  • Friction: Seals create friction, which generates torque. The amount of torque depends on factors such as seal material and design, bearing surface finish, lubrication and the speed of rotation.
  • Seal Design: The design of the seal, including its contact pressure against the shaft and housing, can impact rotational torque. Tighter seals, which provide better protection against contamination, may require higher torque to overcome the resistance they create.

Bearing Seal Material Composition

Bearing seals are typically made out of materials such as rubber or various types of synthetic polymers, depending on the specific application and required properties such as durability, flexibility, and resistance to heat and chemicals.

Speak with a bearing manufacturer for the right seal selection for your application.