according to ISO 898, part 2

Chemical compositions of nuts

1) Nuts of these strength classes may be made from free cutting steel, unless other arrangements have been agreed upon between the buyer and the supplier. When using free cutting steel, the following maximum proportions of sulphur, phosphorus and lead are permitted:
sulfur 0,34 %
phosphorus 0,11 %
lead 0,35 %

2) For these strength classes it may be necessary to add alloys in order to achieve the mechanical properties of the nuts.

Nuts of property classes 05, 8 (style 1 above M16 or style 1 fine thread), 10 and 12 must be quenched and tempered.

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