Depth - the dimension from front to back. The standard is listed as 14" maximum, with 13" as a de-facto standard. The module depth is influenced by the End Cap or Outside Corner modules. T-trak standards specify using 282mm and 315mm radius track for corner modules. When this track is mounted with centerline of the track the standard 2" from the front edge of the module, it makes the corner module 14-3/8" square. Two adjacent outside corner modules make up an End Cap.
The standard End Cap depth is listed as 14-3/8". We make our end cap just a little deeper - 14-9/16". The extra 3/16" is on the outside of the module so it does not affect the fit as an end cap. This module size is the most versatile because this "depth" fits 372mm of track. Two of these modules together make a standard "junction" or can be used in a variety of ways. Check it out Here.