I'm always leary of supporting heavy objects with fastener vertically. Although the pulling tension rating of the fastener is 1900 LBS, whats the rating of the material, whats the rating of the material it is in. (I guess you had the same question. For wood, it depends on the wood... And , depends on conditions too, what if there is a flood, and it gets soggy, not that it would, but it could.) When you have the fastener horizontal to the load, you're then dealing with the shear strength of the fastener, and material, which most often will be much higher.
Just for refferance fixture supports
need to be independant of the box for it.
I often say when explaining the extra work involved for hanging chandelliers, "You have to build it as if you could have sex hanging from it. Not that you would, or suggest that you do"
[This message has been edited by e57 (edited 07-01-2005).]