Engineering Fits and Tolerances

This would provide a clearance fit of somewhere between 0.04 mm (largest shaft paired with the smallest hole, called the Maximum Material Condition - MMC) and 0.112 mm (smallest shaft paired with the largest hole, Least Material Condition - LMC). I - International Tolerance Grades - Standard tolerances are divided into two categories, Holes and shafts. They are denoted by the letter ‘H’ (capital for Holes and small for shafts) eg- H7 tapped holes/nut and h7 shaft or bolt. H7/h6 is a common tolerance that gives a tight fit. - H7 means in ISO fit 10+0.015−0, meaning up to 0.015 mm larger, and 0 mm smaller). h6 would mean 10+0−0.009, which means as small as 0.009 mm and 0 mm larger. - Machining Tolerances - Dimensions - It is the total amount a dimension is allowed to vary from specified dimension. - It can be expressed as either a upper/lower limit, allowable above/below a certain value or the variance by itself. - The difference between the upper and lower limit is the tolerance band and they can be specified by up to 4 significant digits. - - - - - - Shaft and Hole - -

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