Select the Rockwell scale of interest from the following choices:

• Rockwell HRA (161 KB)
  
  
• Rockwell HRB (165 KB)
  
  
• Rockwell HRC (152 KB)
  
  
• Rockwell HR15N (166 KB)
  
  
• Rockwell HR30N (168 KB)
  
  
• Other Rockwell Scales (81 KB)
  

References

• NIST Recommended Practice Guide - Special Publication 960-5:
  Rockwell Hardness Measurement of Metallic Materials ( 2.86 MB); January 2001
  
  
• EA-10/16: EA Guidelines on the Estimation of Uncertainty in Hardness Measurements ( 685 KB); October 2001
  
  
• NPL Publication CMAM 87: Uncertainty in Hardness Measurement ( 1.91 MB); April 2003