Instrument nut sizing

Let'sgoflying!

Let'sgoflying!

Touchdown! Greaser!
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Dave Taylor
Is there a 'most common' instrument nut size?

ie "thousands of size X are in use, whereas the other sizes are rarely used"

I am not sure I can measure the distance from the back of the gauge bezel to where the 'groove' is. Its a standard 3&1/8" ASI with air driven pitot/static ports.

The entire bezel is 3/8" thick, but the groove is somewhere down the screw hole.

https://www.aircraftspruce.com/catalog/hapages/instrumentmountingnuts.php

Was hoping someone out there was familiar with this, had run into the question and had a firm non-guess answer.

'.... the instrument bezel thickness can be different per gauge. They are ordered by the back bezel thickness. They are inserted from the back, and they have ears pointing out that slide into a groove between the front and back bezel to stay in place.'
 
there are like 20 different lengths of those irritating grasshopper nuts, to the 64th of an inch if i recall -- and I couldn't get confident in the length measurement of my mangled, 1968 vintage grasshoppers. I copped out and did the ez-nuts thing. piece of cake.
 
Let'sgoflying! said:
Is there a 'most common' instrument nut size?
Click to expand...
No. There are also a number of different types. But there is a specification that gives specific details on length/type vs bezel thickness/attachment. If I can find it I'll post it. However, every chance I could I would convert to nutplates or a DIY version of the EZ nuts mentioned above.
 
I've gone to these mounting rings that do away with the "grasshopper" nuts.

https://www.aircraftspruce.com/catalog/inpages/instrumentmtkit.php

10-00335.jpg
 
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