15 are hardened locally in the region of their bearing surfaces 17 and their guide surfaces 19 including in each case a narrow adjacent region while the remaining regions and the fitting lower part 11 are unhardened i e remain soft the surfaces interacting with these surfaces i e the internal toothing of the fitting upper part 12 and the guide sides 23 of the toothed segments 21 can also be hardened the hardening takes place by means of a laser this method with a specific local application of heat and integral quenching results in only a small distortion of a component at the same time the wear of the supporting surfaces in the case of frequent stress is greatly reduced and higher surface pressures can be absorbed in the second exemplary embodiment a fitting 105 has a fitting upper part 112 which is designed as a ring gear for this purpose the fitting upper part 112 has a radially inwardly pointing toothing 132 on the circumferential surface of a cup shaped depression the tooth flanks and tooth heads of the toothing 132 are laser hardened furthermore the fitting upper part 112 has in its center a collar formation 134 which is used as a.