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A large steel manufacturer wanted to increase replacement intervals of a 4-row Tapered Roller Bearings used in the hot strip mill. Due to severe operation conditions, standard bearings provided only 1,400 hours of operation. The key target was to decrease spend on bearing replacement and maintenance.
NSK inspected the bearing units along with the operating conditions. As a result new 4-row bearings with modified internal design and contact angle were delivered for testing. New bearing lifetime was increased up to 2,200 hours.

Key Facts

  • 4-row Tapered Roller Bearings running 1,400 hours before replacement needed.
  • Causing frequent line stoppage
  • NSK Solution: Modified internal design of bearings
  • Increased lifetime/uptime
  • Reduced down-time
  • Cost saving for bearings replacement and maintenance 
  • Finishing Section of Hot Strip Mill
  • NSK 4-row Tapered Roller Bearing

Value Proposals

  • NSK engineers inspected the machine and operating conditions
  • The analysis showed that the existing bearing solution was not adequate for the application
  • Due to the sever operating conditions, NSK recommended additional modification of the bearings internal design along with a suggested contact angle change.
  • A training was provided regarding root cause failure to prevent further issues
  • The customer received increased bearing life and reduction in maintenance costs

Product Features

  • Steel material technology
  • Special NSK heat-treatment technology
  • Optimum chemical composition design technology
  • Bearing life is 3 times longer than that of conventional bearing
  • Reduced non-metallic inclusions on raceway surface inhibiting generation of surface cracks

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
Bearing replacement costs $463,105 Bearing replacement costs $308,737
Additional maintenance costs compared to NSK solution $10,720 Reduced maintenance time and no additional costs $0
Total Costs $473,825 $308,737



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