Internal Joist Mount
Internal joist mount for ceiling installations, bridges 16"-23" centers and supports up to 300 lbs (136 kg)
The Chief CMA385 is an internal joist mount designed to bridge ceiling joists in professional AV installations. This accessory expands to accommodate joist spacing ranging from 16" to 23" (254–584 mm) centers. It features an adjustable clamping bracket that includes a threaded fitting, specifically engineered to accept a 1.5" NPT threaded extension column. With a weight capacity of 300 lbs (136 kg), this mount provides a secure transition from the ceiling structure to a vertical extension column. The unit has an overall dimension profile of 4.1" x 4.5" x 22.7" (105 x 114 x 577 mm) and is TAA compliant for government and enterprise projects requiring specific sourcing standards.
Specifications are supplied by the manufacturer. For complete details, check the Resources section.Key features
Specifications
| Depth | 22.7 in (57.7 cm) |
| Extension | 14.1" - 22.75" (35.81cm - 57.79cm) |
| Height | 4.1 in (10.4 cm) |
| Overall Dimensions | 4.1" x 4.5" x 22.7" (105 x 114 x 577 mm) |
| Shipping Weight | 10 lbs (4.5 kg) |
| Weight Capacity | 300 lbs (136 kg) |
| Width | 4.5 in (11.4 cm) |
| Accessory Type | Ceiling Plates and Adapters |
| Color | Black |
| TAA Compliant | Yes |
| UPC | 841872002729 |
| Certifications | TAA |
Resources
Questions about this part
Will the CMA385 work with my existing ceiling extension column?
The CMA385 features a 1.5" NPT threaded fitting specifically to accept a 1.5" NPT threaded extension column.
What joist spacing can the CMA385 bridge?
This mount is designed to bridge ceiling joists with centers ranging from 16" to 23" (254–584 mm).
How much weight can this joist mount support?
The CMA385 has a maximum weight capacity of 300 lbs (136 kg).
Is the CMA385 TAA compliant?
Yes, this product is TAA compliant for projects requiring adherence to the Trade Agreements Act.
What dimension is the CMA385 extension range?
The extension range for this mount is 14.1" - 22.75" (35.81cm - 57.79cm).