![]() ![]() This method of standard tolerances is also known as Limits and Fits and can be found in ISO 286-1:2010 (Link to ISO catalog). For a shaft of the same size, h6 would mean 10+0−0.009, which means the shaft may be as small as 0.009 mm smaller than the base dimension and 0 mm larger. The actual amount bigger/smaller depends on the base dimension. The tolerances work in such a way that for a hole H7 means that the hole should be made slightly larger than the base dimension (in this case for an ISO fit 10+0.015−0, meaning that it may be up to 0.015 mm larger than the base dimension, and 0 mm smaller). H7/h6 is a very common standard tolerance which gives a tight fit. For example: H7 (hole, tapped hole, or nut) and h7 (shaft or bolt). They are labelled with a letter (capitals for holes and lowercase for shafts) and a number. ![]() ![]() The standard (size) tolerances are divided into two categories: hole and shaft. When designing mechanical components, a system of standardized tolerances called International Tolerance grades are often used. ![]()
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