In June 1975, drafts of the planned new editions of DIN 315 (wing nuts) and of DIN 316 (wing screws) were published; they made a distinction between Part 1 “heavy duty type” and Part 2 “light duty type”. This distinction did not however meet with general approval. because it did not reflect the real situation in practice.

Consequently, new draft standards were published in December 1980, which no longer made this distinction. In lieu thereof, constructional dimensions of the wing nuts and wing screws have been selected In such a way, also form the tolerance aspect, that the most common production series are covered thereby, without having to worry about any impairment of the proper functioning of the components due to the revised dimensions and tolerances.