STAUBLI 14.5204-29
Stäubli 14.5204-29 is a color ring for the FR21 family, used as a coding element on Stäubli 16BL series round, single-pole insulated plugs and panel-mount sockets. The specific color code here is 29, which corresponds to white.
In practice, it's a small, simple spare part, but it serves an important function: it helps distinguish different connections from one another. This is especially useful when working with multiple connectors on the same system, or when connections need to be recognized quickly during assembly, service, or troubleshooting.
The FR21 color rings are available with several code numbers, and this variant fits into the documented color coding for the 16BL series. This makes it relevant where the same marking and structure as the rest of the Stäubli solution are to be maintained.