Abstract: An accessory for an electrical connector, known as a backshell adapter assembly, includes a coupling nut and a generally tubular adapter body. The adapter body is axially secured relative to the coupling nut without the use of a retaining ring by flaring one end of the coupling nut and forming an annular shoulder about the inner circumference of the flared end. The annular shoulder formed on the flared end of the coupling nut cooperates with an annular shoulder formed on the adapter body to provide axial securement of the coupling nut relative to the adapter body once the flared end is crimped. An important aspect of the invention is that the backshell adapter assembly can be used as a stand-alone device or can be used with one or more accessories, such as a grounding spring and an antidecoupling ring for custom applications.