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General control line discussion => Open Forum => Topic started by: Bootlegger on February 16, 2017, 01:05:12 PM

Title: Steel 4-40 inserts
Post by: Bootlegger on February 16, 2017, 01:05:12 PM: Looking for some 4-40 steel inserts, not 4-40 "T" nuts, Du Bro makes these In brass, but I need them in steel, who can help??
The engine keeps coming loose in the brass inserts, and I need to clean them so that I can put some lock tite on them in hopes they will stay, so any suggestions will be appreciated...
Title: Re: Steel 4-40 inserts
Post by: RknRusty on February 16, 2017, 01:26:57 PM: Gil, these are steel and will work in wood. They make miniature sizes too.
http://www.minibearings.com/store/partstab/insertsselftappingforplasticssteel/insertsselftappingforplasticssteel/a/1/

Also do a search for Keenserts. I've heard good things about them from our resident engineers.
Rusty
Title: Re: Steel 4-40 inserts
Post by: eric rule on February 18, 2017, 03:35:01 PM: Get in touch with the folks at Timesert. They have 4-40 steel inserts

Eric
Title: Re: Steel 4-40 inserts
Post by: Tim Wescott on February 18, 2017, 04:56:49 PM: Quote from: RknRusty on February 16, 2017, 01:26:57 PM
Also do a search for Keenserts. I've heard good things about them from our resident engineers.

The Keenserts that I've seen don't have threads that are deep enough that I'd trust them in wood. At least, not until some ~~fool~~ uh, courageous experimenter went and tried them out in his expensive plane and found them reliable.

I might be that guy, if it's a plane I'm not terribly attached to and if I epoxied the Keenserts into the motor mounts.

So Ed! Give it a try and report back!
Title: Re: Steel 4-40 inserts
Post by: Doug Moisuk on February 18, 2017, 05:57:32 PM: What's coming loose? The insert or the bolt. I put the brass insets in with JB Weld and use socket head bolts with lock washers. No problems so far.