Black Guard™ Class ZZ Sets & pins

Black Guard™ black oxide treatment typically penetrates .000040" - .000060" deep, which will visually reveal wear patterns allowing the inspector to calibrate or replace gage pins more effectively.

Black Guard™ treatment will help prevent rust and corrosion, which will extend the useful life of the gage.


  • Prevents Rust and Corrosion
  • Visible Wear Indication
  • Longer Life
  • Class ZZ (.0002" or 0.005mm tolerance) 
  • Go (Plus) or NoGo (Minus)
  • .0005" or 0.01mm diameters
  • .001" or 0.02mm set increments
  • Tool Steel; 60/65 Rc
  • 2" Long
  • 10 microinch finish or better
  • Round within .0001" or 0.0025mm
  • Marked with diameter and direction of tolerance on gages over .0605"
  • Certificate of Accuracy is included.
  • ISO 17025 Accredited and Non-Accredited Calibration Certificates may be purchased.
  • See pages 2-7 in the Gage Catalog for more information