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The ISO System of Limits and Fits is a coordinated system of hole and shaft tolerances for engineering and manufacturing used for cutting tools, material stock, gages, etc. If held to these tolerances, cutting tools, material stock, and gages are available throughout the world.
The hole basis fits have four preferred hole tolerances (H11, H9, H8, and H7); the shaft basis fits have four preferred shaft tolerances (h11, h9, h7, and h6) as shown in Table 6-1. The above shaft tolerances are now covered in the new ANSI B32.1002005 standard.
Select the basic size from Table 4-1 and one of the ten fits from Table 6-1 and read or cut and paste limit dimensions and clearances (interferences) from Tables 6-2 through 6-6 or CD's.