Chief CMA-640 Finishing Ring (Black)

The Chief CMA640B is a decorative finishing ring that hides the rough opening created when a CMS or CPA extension column passes through a suspended ceiling tile. By covering that gap, it delivers a polished look that matches the quality of the equipment you are installing.

The ring has an inner diameter of 1.9 inches, which is sized precisely for Chief’s most common column systems. A hinged design allows you to open the ring, wrap it around an existing column, and close it without taking the mount down. That same hinge makes first-time installations just as straightforward, because you can position the ring before or after the column is in place.

Installers appreciate the ring’s durable construction and black surface that blends into grid ceilings often found in conference rooms, classrooms, retail spaces, and residential theaters. Whether you are upgrading an older projector mount or outfitting a new build with modern displays, the CMA640B keeps the ceiling line tidy and distraction free.

Because the ring is purely decorative, it does not add weight or interfere with load calculations. Instead, it simply finishes the job in a way that clients notice for the right reasons.

• Inner diameter of 1.9 inches fits CMS and CPA extension columns
• Hinged body lets you install on new or existing columns without removing equipment
• Black finish matches most ceiling grids and hardware for a cohesive appearance
• Suitable for both commercial and residential suspended ceilings
• Constructed to withstand repeated adjustments during retrofit work