You can calculate the critical dimension tolerance using tolerance stack-up analysis. In the above example, m and k have defined the tolerance class.
If I find some time tomorrow, I will see if I can scan my tables and send them to you. For example, the manufacturer recommends ISO 2768-mk for sheet metal parts and ISO 2768-fh for machined components. I wish I had a copy of the complete tables I could email you, the following link is mounting and dismounting catalog that has tables in the back, but does not have all of what you are looking for. Are you sure you are not looking at H tolerance tables? The capital H is for holes and all of those are 0 to a plus number.Īfter you have used it a bit, these tolerances get easier. The +43 on the h9 tolerance is definitely wrong, all the h tolerances are +0 and a negative number. I'm using a book published by FAG Bearings that lists the complete tolerance range for each designation, I don't have my Machinerys Handbook here to check and see what is in there.
Symmetry (Position for ISO G&T Standard not-ASME or ANSI GD&T) Ranges in nominal lengths in mmīearing tolerances are usually fairly tight since that controls the amount of internal clearance of the rolling elements to the race of the bearing when installed.Īn M6 tolerance on a 47mm bore should be -4 to -20 according to my book.
Perpendicularity Ranges in nominal lengths in mm Straightness and Flatness Ranges in nominal lengths in mm Tolerance class designation (description)Įxternal Radius and Chamfer Heights Permissible deviations in mm for ranges in nominal lengthsĪngular Dimensions Permissible deviations in degrees and minutes for ranges in nominal lengths Linear Dimensions: Permissible deviations in mm for ranges in nominal lengths
ISO 2768 is mainly for parts that are manufactured by way of machining or removal of materials. ISO 2768 and derivative geometrical tolerance standards are intendedto simplify drawing specifications for mechanical tolerances. Variations on dimensions without tolerance values are according to ' ISO 2768'.