Magnetic ceiling hooks - round

With any suspended application, we recommend applying a good margin of safety.

Some suppliers quote higher load ratings for the same magnets, so we tend to err on the side of caution.

Suspended Ceiling Grids

While many ceiling grids are made from steel and, therefore, magnets can be used, the steel is usually very thin and covered in a plastic coating. This reduces our suggested safe loading for the small 25mm diameter hook to 250 grams per fixing (i.e. 0.5 kg for a pair - which is often perfectly satisfactory for lightweight signs and standard POS displays).  
There is no advantage in using a larger magnet on a typical 25mm wide grid as the magnet will overlap and provide no benefit.  
We suggest you also consider one of our twist on mechanical ceiling grid fixings when convenient.
 

Sign Panels

Size of magnetic hooks required to suspend a sign panel made from common materials

This guide for the selection of magnets applies to our ceiling magnets fixed to steel beams, steel ceiling panels, etc.  Our recommendations are based on a typical 1m wide x 500 mm wide sign panel (0.5 sq.m).  For different size panels, use pro rata figures - e.g., the weight will also be halved for a smaller panel half that size.
 

* Magnet power is reduced on thin steel sheet and also on painted and/or coated surfaces.  

The force should be at approx. 90 degrees to the surface, not in shear.
These magnet sizes are recommendations for optimum fixing situations and incorporate a factor of safety of at least 2:1
In some vulnerable situations a safety factor of 4:1 may be appropriate.  In this case for any given magnet the max panel size should be halved, or step up to the next size magnet.

Disclaimer: Information provided here should be taken only as guidance since we have no control over the exact situation to be found on site.  It is the responsibility of the specifier or installer to check that the magnetic fixings are suitable for the purpose intended.