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The Tolenrance Grade in CNC Machining


In CNC machining, tolerance grade is an important consideration factor to ensure the accuracy and quality of machined parts. Tolerance grade defines the tolerance range of part dimensions, that the allowed size deviation, which plays a critical role in actual CNC machining process.

The development of CNC machining technology has significantly improved the precision of machined parts and made it possible to achieve more complex shapes and structures. Tolerance grade provides a unified standard for part design and CNC machining, ensuring a certain consistency across different manufacturers and machining processes.

Common ISO tolerance grades, such as ISO 2768-m, are suitable for general mechanical machining and general engineering requirements. It provides reasonable tolerance range, which is sufficient for CNC machining of most common parts.

However, for some special applications and high-precision requirements of parts, stricter tolerance grades or specially customized special tolerances may be required. These tolerance grades require higher precision and smaller size deviation to meet specific functional, fitting, or assembly requirements.When determining the tolerance grade, it is necessary to consider the part functionality, environmental factors, process requirements, and cost factors to ensure that the machining cost is optimized and the production efficiency is improved while meeting the quality requirements.

In short, tolenrance levels play an important role in CNC machining, ensuring the dimensional accuracy and quality of processed partsm. Choosing the appropriate tolerance level crucial for achieving design requirements, meeting customer needs, and ensuring component reliability.


  • Height Gauges

  • Vernier Calipers

  • Micrometers

  • Feeler Gauges

  • Thread Gauges

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