The May 1970 edition of DIN 928 specified property class 8 with the suffix “weldable” for weld nuts. In the meantime, the proof loads for nuts in international specifications have been raised (see DIN ISO 898 Part 2), the nut heights also being recalculated (see DIN 970).

It turned out to be impossible to increase the heights for weld nuts, thereby aligning them with the principles for the calculation of nuts with full loadability, since weld nuts are predominantly mounted automatically using appropriate equipment and, what is more, frequently, for example in the motor industry, in so-called nut holders (cages).

Any change in the dimensions of the nuts would have given rise to considerable problems, which would not have been balanced out by slightly higher resistance to stripping.

Therefore, this new edition of the standard does not specify a property class for the nuts and retains the same dimensions. Instead, the standard only specifies steel with a maximum carbon content of 0,25%. Proof load values, corresponding to the values for nuts with coarse thread of property class 8 as in DIN 267 Part 4, October 1971 edition, have been allocated to the weld nuts. Because of the tolerance position G of the thread, the previous proof load values have been reduced following DIN ISO 898 Part 2 (clause 1), March 1981 edition, for sizes up to M7 to 97% and over M7 to 97,5% of the values for nuts with thread tolerance position H. Nevertheless, the nuts can be mated with bolts of property class 8.8.