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)? I have no real good idea of
shear factor for this type of fastener........ ie. Would the screw break
before the wood?????

The eyebolts that would be used are 3/8" diameter and 3 1/2" - 4" long. The
eyebolts would be just standard Home Depot mild steel with galvanized plate
plate I suppose. I am thinking that these two bolts would equally share the
load and probably be fine but......... The weight of 400 pounds might strip
them out of the 2x4s....... Is this likely or would the threads be strong
enough ??
Not looking for any promises.... just some good swags. And yes, I am
intending to hang from this but I weigh a little over 200 pounds.... safety
factor you know..... :~)

Thanks for any help!



My mom's porch swing hangs from two screw-eyes just like that. It's been
swinging 2 or 3 adults off and on, plus the weight of the swing, since
1957. The 2 by is different, it was salvaged from the old house built
around 1910. My porch swing hangs from two screw-eyes in an ordinary 2 x 4.

To me, an eyebolt implies machine threads and a nut, a screw-eye implies
wood threads. But that may just be my idea.
--
Gerald Ross
Cochran, GA

A pessimist is a person who mourns the
future.





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