What does fit H7 mean?
Learn all about the H7 fit: precise clearance fit, ISO tolerances, limit dimensions and practical applications in metalworking.
Fitting parts precisely to each other with the H7 fit Within the ISO fitting system, we only offer the H7 clearance fit. This fit offers clearance, whereby the diameter must not be smaller than specified, but can be a few micrometers larger. This means that the parts can still be moved by hand. The tolerances for the H7 fit are listed in the following table:
Tolerance class H7: Limit dimensions in µm
Lower limit dimension: 0 µm
Nominal dimension range from 1 to 3 mm
Upper limit dimension: +10 µm
Lower limit dimension: 0 µm
Nominal dimension range over 3 to 6 mm
Upper limit dimension: +12 µm
Lower limit dimension: 0 µm
Nominal dimension range over 6 to 10 mm
Upper limit dimension: +15 µm
Lower limit dimension: 0 µm
Nominal dimension range over 10 to 18 mm
Upper limit dimension: +18 µm
Lower limit dimension: 0 µm
Nominal dimension range over 18 to 30 mm
Upper limit dimension: +21 µm
Lower limit dimension: 0 µm
Nominal dimension range over 30 to 50 mm
Upper limit dimension: +25 µm
Lower limit dimension: 0 µm
What is H7 tolerance?
H7″ has a tolerance range of +0 μm / +15 μm in the Ø range of 6.00-10.00 mm, while -7 μm / +2 μm applies to “K6”.
The reamers themselves are manufactured within these limits according to manufacturer-specific tolerances.
Further resources for precise engineering
Discover the best tools for your manufacturing processes:
With our online fit calculator , you can calculate fits quickly and precisely.
For detailed tolerance information, we offer comprehensive tolerance tables.
These resources help you to plan and implement your projects with precision – perfect for metalworking and manufacturing technology experts.
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About CNC24
CNC24 is the transparent manufacturing cloud for the global procurement of components. With just one contract and contact partner, CNC24 provides access to more than 500 selected manufacturers from all over the world.
CNC24 specializes in plastic and metal components using the production methods of milling, turning, sheet metal processing, die casting, injection moulding and 3D printing.
For quality control, all parts undergo an additional inspection process in the in-house measuring center before they are delivered. CNC24 was founded in 2019 by co-founders Willi Ruopp and Marlon Gerat. The start-up serves all industrial sectors with a need for production parts – from special machinery and plant engineering to IOT and medical, testing and measurement technology.
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