The shape and size of irregularities on a machined surface have a major impact on quality, performance (leakage), and longevity.

Whether you're working with o-rings, gaskets, or oil seals, each has a unique surface finish recommendation. Optimizing and staying within the recommended limits will help your equipment maintain longer uptime and better sealing performance.

Improving and controlling the ideal surface roughness will usually increase manufacturing costs, which often presents itself as a trade-off between the cost to manufacture the hardware and application performance.

Properly defining, measuring, and controlling surface finish is critical to the functional reliability and service life of a seal.

Part 6, the final installment of our video series on Surface Finish, will discuss recommendations for seals. The full table of contents is below: 


1. Part 5 will discuss:

2. Surface Finish Recommendations for Seals

  • O-Rings
  • Flat Gaskets
  • Oil Seals
  • PTFE Seals

3. Effects of finish on friction, wear, and leakage

4. General Considerations


Watch Part 6 of our video webinar series regarding surface finish & recommendations for seals:


For more information about Surface Finish or to speak to an engineer about proper surface finish for your application/project, contact Gallagher Fluid Seals today.