JIS B 1022:1999

This Japanese Industrial Standard specifies a selection of tolerances for use in the preparation of the product standards for plain washers, grades A and C, for bolts, screws and nuts with nominal thread diameters from 1 mm up to and including 150 mm. Deviations from the tolerances specified in this Standard are permitted in product standards only for valid technical reasons. It is recommended that these tolerances also be used for non-standard plain washers. In cases where the maximum material principle according to JIS B 0023 is appropriate to certain features of certain products in the product standards, other tolerances may be applicable.