buck wrote:
OK here's one for you mechanical engineers out there........... I
want to
screw two (2) screw eyebolts into an overhead 2x4 rafter. Then I will
attach a 3' long chain to each one so that they hang down.
Assuming that
the wood of the rafter is excellent and structurally sound as well
as any
other hardware, such as the chain ...... "Would these two screw
eyebolts
hold up to 400 pounds (share 200 pounds each)?
snip

I wouldn't touch this one on a bet.

"Why?", you ask.

Because you know ZIP about that 2x4.

What is it's unsupported length?

What existing loads does it support?

What is the condition of that 2x4. (checks, cracks, knots, etc)

There are other considerations, but those above are enough to reject
the idea.

Lew