Design catalogs, much used in recent years in Germany [1–3], are excellent resources for methodical mechanical design. They are a kind of information store, containing the special knowledge necessary for design engineers in a concentrated, clearly arranged and easily accessible form. A design catalog consists of three parts: (1) classification, (2) main part, and (3) charactersitic properties. The first part presents a systematic, contradiction-free subdivision of solutions in the main part. It enables a quick check of completeness and, if necessary, allows completion of the solution field. The main part contains the solution field and identifies each solution in the form of sketches, text, equations or diagrams. The third part is used to seek and select the solution that is most suitable for a given problem. Therefore this part should contain all important characteristic properties of each solution. This paper introduces a design catalog for “Spatial Pairs of Elements”. In 1876 Reuleux discovered that in the general solution of the machine problem the elementary parts of a machine are not single, but always occur in pairs. Therefore, from a kinematic point of view, the machine must be divided into pairs of elements. A catalog that includes all important spatial pairs of elements, therefore, would be a fundamental resource for the designer. The design catalog for spatial pairs of elements contains 9 point-contact, 31 line-contact, and 10 surface-contact pairs, divided according to three classification aspects: type of contact, type of spatial element, and type of surface element. The main part shows the pairs of elements with their sketches, pairing restraints, and specific axis. The third part includes the kinetic and construction properties, frequency and application fields, which render possible the selection of an optimal pair of elements for given conditions.