Non slip slotted hole connection

[Peter G]

I am looking for a quick and simple way of preventing any ongoing movement once the bolt/washer has been correctly located within a slotted hole? Other than welding or 2nd locking screw.

 

[jjl317]

In steel, the only option I am aware of is using a standard AISC slip-critical connection. Though maybe someone out there has a better/different option in steel.

In the curtain wall industry, these type of adjustments are often made from custom aluminum extrusions, with serrated surfaces and interlocking serrated washers. See attached photo from the Halfen website.

 

[XR250]

What are the loads? I imagine just torquing the f out of it will be plenty.

 

[le99]

Tack weld the washer to the base material, or add stop bars.

 

[rb1957]

instead of slotted holes, drill on installation ?

I'm used to seeing the serrated plates.

But the OP's design, with two (four ?) nuts looks ?? to me. Who can have the vertical post with it's brkt as a subassembly. But I'd split the lower (foundation?) brkt so that the sides would be welded in situ to better trap the vertical post.

another day in paradise, or is paradise one day closer ?

 

[JStephen]

One approach- chain tensioning clips used on some bicycles and motorized items:

https://i5.walmartimages.com/asr/c7....jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF

The little bar-shape is actually a thin channel that fits on the dropout.
The "tighten the f out of it" sounds promising except that it looks like you're tightening against wood or lightweight tubing- if there's a nut and washer on either side of the slot itself, that might work a lot better.

 

[Peter G]

Thanks to those who responded. They are all good ideas, but unfortunately not what I was hoping for. Perhaps a large plate washer with self-drilling screw might be the best way forward.

 

[rb1957]

looks like you're going with the 2nd response ?

another day in paradise, or is paradise one day closer ?

 

[dik]

or a small tackweld... I like Loctite Red, myself...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Tmoose]

Is that assembly a commercial connector in the OP ?
What is it's intended use, and load rating ?
Hanging pictures or mirrors or light weight interior panels I'd guess.

A long threaded stud spanning a double wide bracket with a nut and tiny washer on each side of the side flanges does not offer secure reliable clamping for any but the lightest loading in my opinion. Even if torqued properly. If those are split lock washers, or internal/external tooth washers I think your concerns about joint security are well justified.

There is a screw on the top face of the bracket that grips the rectangular tubing.
Does it bear on the threaded stud?
Is that screw the vertical adjustment for the rect. tube?