Abstract
The article describes the requirements for SB4-type rail spring clips applied for railways before the spring clips are officially approved for use. Two basic aspects of spring clips are discussed: i.e. the material aspect (chemical composition, heat treatment, microstructure, and decarburization) and the aspect of geometric shape. Both of these aspects have a major impact on the performance of the end product. The article features examples of measurement results concerning selected dimensions of a batch of spring clips that did not meet the applicable requirements. It is an introduction to a series of publications presenting research on the influence of material composition and geometry of a product on its clamping force, stiff ness, elasticity curve, and assembly strength. Keywords: rail fastening, spring clip, dimensional measurements, hardness tests
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