Contact Us


A paving producer in Poland was experiencing frequent breakdowns due to bearing failures in a vibrating thickener machine. The bearings were mounted in an electric motor which supported unbalanced weights providing the vibration. In a period of 4 months the customer experienced 10 failures and each time it took 2 hours to replace the bearings. The bearings were experiencing grease loss due to high operating temperatures in excess of 110°C 230°F. NSK engineers performed an application review and recommended that the existing shielded bearings be replaced with NSK fluoride rubber contact seals.

Key Facts

  • Concrete (sett) thickener
  • Conditions: High temperature and vibration
  • Loss of grease and high operating temperature were identified as the cause of bearing failure
  • NSK solution: Deep Groove Ball Bearings with high temperature DDU seals and special material rings with  increased clearance
  • Extended life resulted in zero maintenance  after NSK bearings were used
  • Cost saving based on reduction in  failures and reduced maintenance required
  • Vibrating Thickener
Deep Groove Ball Bearing, 874x555
  • High Temperature Sealed Deep Groove Ball Bearings

Value Proposals

  • The customer experienced multiple failures on a vibrating motor application. NSK engineers performed analysis on a failed bearing which showed significant grease loss due to high operating temperatures.
  • After reviewing the application it was determined that the existing shielded deep groove ball bearing was inadequate for this application. NSK recommended a high temperature contact seal in combination with special material rings and C3 clearance.
  • A trial with the NSK DDU bearing was conducted and the results showed zero failures in a 4 month period.
  • This resulted in a significant reduction in maintenance costs, improved productivity and zero lost production.

Product Features

  • Steel Cage
  • Heat stabilized rings
  • C3 Internal bearing clearance
  • High temperature grease
  • High performance in contaminated environment
  • Temperature stability: up to 150°C 302°F
  • Longer bearing life through superior seal performance (Viton® Seals)
  • Reduced noise level "E" class for electrical applications

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Bearing failure - 20 in 8 months $213 No bearing failures during 4 months of testing $107
Maintenance: 20 electric motor $107 each $2,100 No maintenance required in 4 months $0
Lost annual production: 40 hours at $799/hr $31,960 No downtim in 4 months  $0
Total Costs $34,273 $107



NSK uses third-party services that help us to improve our web site and show you more interesting content. In order to use these services, we need your consent. This can be revoked at any time. More information can be found here Link to privacy policy.