Allen-Bradley 855T-BSB Surface Mount Base

Allen-Bradley 855T-BSB is a 70 mm surface-mount mounting base designed for Rockwell Automation's 70 mm Control Tower/Stack Light assemblies. The base provides a panel-mount footprint with a black housing for a durable, clean appearance in industrial environments, and it is listed as the no-cap variant in the 855T family. It is used to mount signaling tower modules to panels, with a cap-included variant available as 855T-BSBC and a conduit-mount variant in 855T-BCB for different installation needs. As a surface-mount base, the 855T-BSB supports straightforward replacement or integration of 70 mm stack-light heads without altering the base itself. Rockwell Automation notes the product as discontinued as of October 1, 2019, reflecting its status within the lifecycle of the Stack Light hardware. The base is associated with Austria-origin manufacturing and bears the 855T-BSB identifier, aligning with other 855T signaling hardware used for visual indication in automation environments. Typical applications include machine status indication, line monitoring, and safety signaling on automated production lines where a compact, modular base pairs with compatible 70 mm signaling heads to convey clear visual signals to operators and maintenance staff.