Thread size on defroster duct nuts!

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Mar 23, 2005 | 10:29 AM

theGman

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From: Waynesboro, Virginia

Thread size on defroster duct nuts!

Help! Paul's fat fingers dropped and lost one of the nuts attaching the drivers side defroster duct. It is too far up to play matchy-matchy with, so I was wondering if anyone knew the size/thread pitch?

I had to take out the drivers side duct in order to modify (cut a chunk out of the left middle and fill with duct tape) so my that the upper left gauge on my new 5- gauge/dash panel would clear. Upon installing, I got one nut of the two on, but one fell into the black hole we jackstand warriors know so well.

Thanks, Paul

Just thinking, I should get my name changed from "pgayda", which really plain, to "fatfingers", which fits my mechanical ability.

Mar 23, 2005 | 02:02 PM

AXracer

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From: Durham NC

I don't know for sure since I didn't drop mine

but I'd guess a 10-24. Just go to the hardware store and buy a few of each size from 6 to 12 then you'll have extras for the next time you make a deposit into the nut bank. Add a star washer under the nut so you don't have to replace it again from vibrating loose.
PS: Duct tape won't hold long in the warm air unless you use the metal foil type, not the cloth stuff. A simple metal patch formed from aluminum roof flashing stock (soft and thin shape with your fingers, cut with scissors) Pop-riveted on and sealed with silicon caulk would be a far more permanent fix. Fix it now and you won't have to pull it out again later.

Mar 23, 2005 | 05:08 PM

theGman

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From: Waynesboro, Virginia

Thanks for the info; unfortunately I will have to fix it later, since the instrument panel is installed. For what it's worth, I did this same mod, but a smaller hole, on the same duct in 1998 and the duct tape was still holding up fine. Of course, I know that duct tape is a temporary patch at best.

I was trying to get the exact size, but I have some trial fit nuts. I imagine it is a fine thread like about everything else on the truck.

Mar 23, 2005 | 05:27 PM

AXracer

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From: Durham NC

I thought about that before I first answered but I seemed to recall it was a course thread. Fine thread would be a 10-32.
Any cloth duct tape I've used deteriorated rather quickly especially when exposed to heat, maybe you have found a better grade.

Last edited by AXracer; Mar 23, 2005 at 05:30 PM.

Mar 23, 2005 | 05:30 PM

Randy Jack

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From: Riverside, So Cal

Thegman -

I would have answered earlier, but I needed to measure it after I got home from work. I have the duct out of my 56 also.

It is an 8-32 thread. The stock nut has a star washer on it.