Applies to bars and wire of the materials according to Table 1 of dimensions up to those given in Table 4. These materials are normally used for bolts and nuts according to DIN 267 Part 13 - Bolts, screws, nuts and similar threaded and formed parts; technical conditions of delivery; bolts and nuts primarily of steels exhibiting toughness at subzero temperatures and high-temperature steels - at temperatures above about 300degreeC up to the maximum service temperatures quoted in Table 4 as a guide for long-term operation. These temperatures may be exceeded where the properties of the materials are adequate for the service stress. The criterion is the total loading on the material resulting from temperature, mechanical loading and the ambient media during the proposed time of operation.