This International Standard gives a selection of tolerances specified in ISO/R 286, ISO system of limits and fits -Part I: General, tolerances and deviations, and in ISO 965/111, ISO general purpose metric screw threads -Tolerances — Part III: Deviations for constructional threads, for use in the preparation of ISO product standards for bolts, screws and nuts with thread diameters from 1,6 up to an including 150 mm and product grades A, B and C.
Deviations from the tolerances in this International Standard are permitted in product standards only for valid technical reasons.
It is recommended that these tolerances should also be used for non-standardized fasteners.
The tolerances of form and of position conform to ISO/R 1101/1, Technical drawings — Tolerances of form and of position — Part I : Generalities, symbols, indications on drawings.