Bonded Standoff in Aerospace application

[zonaguy920]

Hello,
Does anyone have any experience using Click Bond products? I'm trying to find info for CB3201 (standoff, locking thread, very large base).

For spec sheet go to:

http://www.enfasco.com/clickbond/PDF/cb3201.pdf

I'll be using these standoffs along with p-clamps to support cables in a flight vehicle. In the spec sheet it lists a clearance depth as D MIN (which I'm assuming means the minimum threaded depth into the standoff depending on the standoff length). What's not clear to me in looking at the spec sheet is if there's flexibility in thread depth.

Say I want to use a 2.000 inch length standoff with a .3750-24 thread... .I can't find anywhere on the spec sheet that specifies how deep the internal thread can be made. Which I would need to know to choose the correct length fastener.

For a 2.000 inch standoff, where all my weight will be at the end my bending stress will be fairly high. So I'll want to limit the depth of the threaded hole in order to have a solid cylinder where my moment arm is largest (in attached image this would be at 1.90 inches).

Thanks in advance for any help/advise.

 

[Screwman1]

Contact Click Bond and ask them the question rather than relying on an internet forum.

 

[tbuelna]

The internal thread the mating screw engages is a self-locking insert (MS21209 or NAS1130). Dimension 'D' is the min full diameter depth of the tap drill hole for the internal threads the insert screws into. Dimension 'D' is provided because aerospace design practice usually requires the installed mating screw to extend at least 1 complete thread pitch beyond the insert. I believe dimension 'E' is the position of an inspection hole used to visually verify the mating screw is installed into the insert with the correct thread engagement. I doubt the tap drill hole depth will extend much deeper than dimension 'D' or 'E', since this would add unnecessary cost.