The article discusses the use of the Russian editor nanoCAD, replacing foreign editors AutoCAD and Autodesk Invenor, for computer-aided design of bolted connections in building structures. It is shown that there are various means for computer-aided design. These include the Mechanics tab and the Bolted Joint tool from the “Design” group, which after calling and specifying the starting and ending points of the connection, opens the “Fastening Details” dialog box. The latest lists bolts, made according to USDD (Unified system of design documentation) standards. Changing the diameter of the bolt metric thread, the type of washer and nut, the authors carry out a preliminary automated selection of the connection, based on the dimensions of the parts to be joined in building structures. If there are no necessary connection components in the “Fastening details” dialog box, they are selected from the Editor’s Element Base in the “Part selection” dialog box. Optimization and refinement of the parameters of pre-designed connections is carried out on the Tab Table parameters of the dialog box “GOST 7796–70 Isp. 1, 3, 4”. For the final check, the Calculation tab and one of the options, the design schemes that are opened in it, are used.