Download document () of 20

Telescoping bracket and box brackets

The BBT-HF telescoping bracket, used with the BBA and BBA-4 box mounting brackets, provides an extremely flexible, fast rough-in solution. Features like auto-height adjustment, Marty Mouse ears, and hands free installation will have your installers out of the wall in a hurry.

Telescoping bracket and box mounting brackets

Eaton's B-Line series telescoping bracket and box mounting brackets help speed installation and reduce complexity on the job site.

BBT-HF Telescoping bracket

With an auto-height adjustment, the rigid BBT-HF telescoping bracket is quick and easy to install.

Simply slide the bracket to the width required and snap both ends of the bracket to the stud and secure with screws. 

Features
  • BBT-HF Hands free snap to stud for 1-1/4" through 1-3/8'' wide studs
  • BBT-HF Auto-ADA height feature
  • All parts work with 4", 4 11/16", and 5" electrical boxes
  • BBA, BBA-2 and BBA-4 work with standard mud rings and adjustable mud rings
  • BBA-4 includes built in backside support extender for stud depths up to 6"

BBT-WF Telescoping bracket for wide flange studs

The telescoping box mounting bracket, BBT-WF, is ideal for wide flange (structural style or wood) studs.  For use with structural style studs that are wider than 1-3/8''.

  • Includes Auto-ADA height feature
  • Works with 4", 4-11/16", and 5" electrical boxes

BBT-16 Telescoping bracket for smaller spaces 

The BBT-16 telescoping box mounting bracket is designed for use with studs with 9-1/4” to 16-1/2” spacing. 

telescoping-500x500-poy.jpg
big-o-parts-II-500x500.jpg

BBA series box mounting brackets

The BBA, BBA-2, BBA-4 and BBA-MG box mounting brackets are designed to  easily snaps onto the BBT-HF and BBT-WF bracket and accepts 4”, 4-11/16” and 5” box sizes.

  • Marty Mouse ears to retain the box when plaster ring is removed
  • Rabbit Ears to attach a plaster ring for data devices without using a box
  • Faster daisy chain boxes; two brackets mount to the same side of the stud
  • UL Listed for U.S. and Canada; CSA certified
  • BBA-2 is designed specifically for 2-1/2” deep studs without modification
  • BBA-4 features a built-in, snap off back support extension for studs from 2.5” to 6” studs 
  • BBA-MG is used with multi-gang boxes, and ideal for fire alarm speaker strobes and nurse call stations in hospitals


The BBT series open telescoping brackets and the and BBA series box mounting bracket are also available as a prefabricated solution.  For more information, visit Eaton.com/ruff-in.

BBT-TG ceiling clips

With the introduction of the BBT-TG ceiling clips, the popular BBT-WF telescoping bracket can be used for t-grid ceiling applications, helping reduce the number of SKUs required for both wall and ceiling installations.  

The BBT-TG clips easily install onto the BBT-WF with two screws. Then, a BBA or the BBA-4 alignment bracket can be attached to the BBT-WF for a rigid and reliable support for fire alarm boxes, nurse call buttons, lighting controls and more, in a ceiling application.  

  • Wide support prevents bracket from rocking, and rigidity of BBT-WF reduces pressure on the ceiling tile  
  • Sheet metal screw location and loophole for support drop wire aids compliance with NEC 314.23 (D)  
  • Install multiple boxes into the same ceiling tile 

Available for field or prefab shop assembly or preassembled on a BBT-WF bracket with box and cover preinstalled. 

Supporting documentation

Get out of the wall faster!

The UL Listed Crouse-Hinds series Quick-Lok outlet boxes and assemblies are packed with features that provide a real benefit to the installer. 

Click below to learn how Quick-Lok can help you save time, reduce complexity and optimize profit on your next rough in project

Additional resources