REDWIRE How equipment design improves sealing component performance, according to Daemar

April 28, 2021 REDWIRE is news you can use from leading suppliers. Powered by FRASERS.

Posted by Daemar Inc.


Daemar Inc. plays two important parts for clients as a major supplier of essential components for industry: a provider o... Read more

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sealing component performance

Daemar offers expert advice on optimizing seals.

Daemar Inc. plays two important parts for clients as a major supplier of essential components for industry: a provider of products, and an expert team offering tips on getting the most out of these offerings. Among its advice is how to get optimal sealing component performance through better equipment design.

To get better performance from its seals, it is important that the bore and the shaft, the two components with which seals interact, are properly designed, according to a Daemar blog post.

Preventing seal movement or rotation

Not only does appropriate bore and shaft design improve sealing component performance; it also extends the seals’ operational lifespan. Bores should have adequate lead-in chamfer and proper tolerance to enable the correct press fit of the seal’s outer casing after installation, which eliminates leaks between bores and seals. It also prevents seal movement or rotation during operation. Shafts also need proper lead-in chamfer, in addition to appropriate diameters and surface finish. Minimal shaft movement and misalignment limits seal lip wear and boosts performance.

Users should consider material, hardness, finish, lead-in chamfer, and tolerance when they design bores. Cast iron and steel offer good surfaces for accepting metal and rubber O.D. seals. Bores should be hard enough to withstand the seal’s O.D., while the finish should be 0.8 to 1.6 μm Ra for metal O.D. seals, or 2½ to five μm Ra for rubber ones. The lead corner should be bore-free and chamfered.

The following design considerations are recommended by Daemar:

  • Eccentricity. Dynamic run-out and shaft-to-bore misalignment can affect sealing component performance. Dynamic run-out is double the distance of displacement between the shaft centre and actual rotation centre. Misalignment means the distance between centre of shaft rotation and bore centre.
  • Finish. Plunge grinding can attain surface roughness of 0.2-0.8 μm Ra.
  • Hardness. Minimum Rockwell C45.
  • Lead-in chamfer. Shaft ends must be chamfered, and the corners rounded and free from sharp edges and burrs.
  • Material. Stainless steel or medium-to-high carbon steel results in top performance from seals.
  • Tolerance. Daemar’s website has convenient shaft tolerance tables.

For more information, contact Daemar.


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Posted by Daemar Inc.


Daemar Inc. plays two important parts for clients as a major supplier of essential components for industry: a provider o... Read more

Contact supplier