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  #11  
Old 11-28-2017, 07:50 PM
vernon smith's Avatar
vernon smith vernon smith is offline
 
Join Date: Jun 2017
Location: Naples FL
Posts: 147
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#6 Torx flat head stainless going into a nut plate is problematic. The square bottom of the Torx, which gives you the nice square flat side facets to push on, also extend very close to the descending 50 degree seat face. Plus, stainless is not as strong as carbon steel.

Either go to steel screws that are very hard to find in #6 flat head Torx or tap out the nut plate to get rid of the pre-load and use Loctite 242 so they will not back out.
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  #12  
Old 11-28-2017, 09:34 PM
RV7A Flyer's Avatar
RV7A Flyer RV7A Flyer is offline
 
Join Date: Jul 2013
Location: US
Posts: 2,251
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Probably already noted/known, but remember that aviation countersinks are 100 degrees, so if you "upgrade", make sure the angle on the head is correct.

And a little valve grinding compound on the bit will work wonders if you have a screw cam out....
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  #13  
Old 11-29-2017, 05:01 AM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
Default Ditto

When it comes to screws in nutplates, Iv'e learned the hard way over 20 years of RV maintenance:

Never install #6 hardware if #8 will serve instead. #6 is notoriously tight/binds easily.

Stainless looks better, but is too soft to trust.

Valve lap compound on screwdriver tip gives a good grip.

A toilet wax bowl ring will thread-lube about a million screws going into nut plates, and prevents heartache.

Toss any screw that looks sketchy. Keep a backup inventory so you won't be tempted to re-use one that isn't pristine.

Screwdrivers eventually wear out, just slower than screws do.

Electric screwdrivers are great for removing screws and for installing them 3/4 of the way in. For final tightening, mankind was given manual screwdrivers to do the job right - preferably ones that bear the Wiha brand name.

Most of us tend to over-torque screws (and AN-3 hardware) by feel alone.
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Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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