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What are the standard accuracy grades?

Standard accuracy grades are defined by ISO 3408-3 which categorizes accuracy classes based on lead error at full length of travel (deviation) and permissible lead error along the path of travel (variation).

  • Standard accuracy for inch series screws is: ±.004 in/ft lead accuracy which is equal to T10 tolerance class per ISO 3408-3 classification
  • Standard accuracy for the metric series with OD ≤ 12mm is 52µm/300mm which is a T7 tolerance class
  • Standard accuracy class for metric series with OD > 12mm is 23µm/300mm with is a P5 tolerance class.
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