BS ISO 355:2019

What is ISO 355-Tapered roller bearings about?  

ISO 355 is an International Standard on tapered roller bearings. 

ISO 355 specifies bearing and subunit boundary dimensions for complete single-row and double-row tapered roller bearings also specifies the flange dimensions of flanged outer rings for a selection of these bearings. 

Who is ISO 355- Tapered roller bearings for?  

ISO 355 on tapered roller bearings is useful for: 

• Manufacturers of roller bearings 
• Manufacturers of tapered roller bearings 
• Automotive industry 
• Mining industry 
• Electrical engineers  
• Mechanical engineers 

Why should you use ISO 355- Tapered roller bearings?  

Tapered roller bearings are ideal for supporting simultaneous radial and axial loads. 

ISO 355 encourages the user to maintain quality and precision by enlisting the boundary dimensions and measurements. If you are a manufacturer, best industry boundary dimensions specified under ISO 355 can help you customize tapered roller bearings to match the requirements of speed, load, temperature and vibration conditions, as per the need of the application.  

ISO 355 also helps in eliminating ambiguity while denoting the values by providing the series designations of the respective class of bearings. 

Overall, adopting ISO 355 specifications can help avoid product failure and enhance service-life of the product, while maintaining high-performance, increased power density and reduced friction in the end-use application. 

What’s changed since the last update?  

BS ISO 355:2019 supersedes BS ISO 355:2007+A1:2012, which is withdrawn. Some major changes between BS ISO 355:2019 and BS ISO 355:2007+A1:2012 include: 

• Contact angle and smallest single chamfer dimension of the inner ring back face added to the double row bearing tables 
• Tables with all dimensions added for bearings with flanged outer rings