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HANDBOOK OF MECHANICAL DESIGN 



Class 4. Quantity Tolerances 



Quantity tolerances shall be the permissible over, or under, run allowed for each 

 release or part shipment of an order. Any shipping quantity within the limits of 

 over, and under, run shall be considered as completing the order. Commercial and 

 close tolerances shall be the same amounts. 



Class 5. Fillet and Corner Tolerances 



Fillet and corner tolerances apply to all meeting surfaces even though drawings 

 and/or models indicate sharp corners, unless such drawings and/or models have or 

 indicate (even though actual dimensions are not specified) fiUet and/or corner dimen- 

 sions of larger radii than the following standards, in which case such actual or indicated 

 larger dimensions shall be considered as actually specified and the tolerances shall be 

 special tolerances. ' 



Fillet tolerances apply to inside corners and edges in aU cases in which surfaces 

 meet at an angle less than 180 deg. 



Corner tolerances apply to outside corners and edges in all cases in which surfaces 

 meet at an angle greater than 180 deg. 



Wheni a corner tolerance apphes on the meeting of two drafted surfaces, the 

 tolerance shall apply to the narrow end of such meeting and the radius will increase 



