Please help me identify these rail buttons..

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Tim51

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Hi all

I picked up these streamlined rail buttons a couple of weeks back. They came in an unlabeled ziplock poly bag, have UNC threaded hex drive counter sunk machine screws, but I later realised they came with no backing nuts or inserts. So I'm wondering if there should be some inserts/nuts that somehow got lost along the way, and if so what will work as a substitute ?

Thanks,

rail buttons.jpg
 
Weld nuts, which need to be epoxied in. Or some people use well nuts. You can use T-nuts, but you have to grind off the prongs.
 
Weld nuts, which need to be epoxied in. Or some people use well nuts. You can use T-nuts, but you have to grind off the prongs.
Good idea - thanks!

Tension here as a silent city watches the World Cup Semi Finals: England 1 Croatia 1 into extra time...
 
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Weld nuts, which need to be epoxied in. Or some people use well nuts. You can use T-nuts, but you have to grind off the prongs.
Grinding prongs off not necessary, grab the prong and bend it back and forth several times with a pair of pliers and they will come right off.
 
Grinding prongs off not necessary, grab the prong and bend it back and forth several times with a pair of pliers and they will come right off.

I've done that on occasion. Also when securing fixings for payload / AV bay sections, I've filed t nut prongs just part way down (so they stand proud but the thread is flush with the outside) then filled the small gap on the inside with JB Weld - it's a bit fiddly but works well.
 
Darn, didn't see your location tag.

You're outside my circle of experience, I've only been as far as Iceland in your direction.
 
Depending on the airframe, you can possibly drill and tap the airframe. Depending on weight it can work on filament wound airframes.

If you want a nut, I would look at a pem nut. Specifically a broaching nut
 
Depending on the airframe, you can possibly drill and tap the airframe. Depending on weight it can work on filament wound airframes.

If you want a nut, I would look at a pem nut. Specifically a broaching nut
Actually this isn't a FWFG airframe - it's a FG wrapped Loc tube, but thanks anyway. The reason I'm using rail buttons - a new experience for me - is I've been unable to get hold of Acme conformals for 5.54" (not sure Acme even make conformals that size..?)
 
I have drill and tapped fiberglassed LOC. I treat the hole with CA prior to tapping.
 
Yes and no. It depends on the size of the rocket and then number wraps of fiberglass.
 
Thanks everyone who contributed for your help on this - whilst we've been conversing another forum member contacted me via PM and is very generously mailing me the right kind of PEM nuts - much appreciated!
 
Actually this isn't a FWFG airframe - it's a FG wrapped Loc tube, but thanks anyway. The reason I'm using rail buttons - a new experience for me - is I've been unable to get hold of Acme conformals for 5.54" (not sure Acme even make conformals that size..?)

I am fairly certain the largest they made was for four inch airframe.
 
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