Mitutoyo Steel Setting Ring 275mm

This steel setting ring is used to accurately and quickly set inside micrometers, dial gages and Holtest. If the setting ring is used properly, it can be used for calibration. 

• Nominal size = 275mm
• Dimensions 
  • ØD = 413mm
  • ØE = 321mm
  • T = 38.1(25.4)mm
• Type = B
• Tolerance between nominal size and actual diameter = +/- 20µm
• Uncertainty of unmarked diameter value = +/- 2.5µm
• Roundness/cylindricity = 3µm
• Distance from side face H = 5.3mm
• Size warranted calibration surface K = 27.5mm