What is the H7 fit and why it matters in precision machining?

The H7 fit is an ISO tolerance designation widely used in precision machining. It defines an allowed variation range in a part's hole so it fits correctly with a shaft, ensuring a predictable and repeatable fit.

Meaning of H7

The letter H indicates that the hole has a positive tolerance relative to the nominal dimension, meaning it will always be equal to or larger than the theoretical measure. The number 7 defines the tolerance grade, an adjusted value for precision machining without being extremely demanding.

Applications of the H7 fit

• Bearings and bushing fits.
• Guides and transmission shafts.
• Parts requiring periodic disassembly without excessive play.

H7 fit at MASA Mecanizados

In our workshop in Subirats, Barcelona, we work with numerical controls and measuring equipment that allow us to guarantee H7 tolerances consistently, both in CNC machining and in conventional turning.

If your project requires precise fits, request a quote and we will advise you with no obligation.