Door threshold hold down screws
 

I'm sure most of you have had the problem where the hold down screws hog out the holes in the floor and no longer grip the sheet metal screws. So you end up using larger screws, but eventually they no longer grip the holes.

I'm considering drilling out the holes and installing rivet nuts for 10-24 machine screws. Have any of you done this? Any cons you can think of?

OK, after doing some research, my best bet looks like 10-24 machine screws with speed nuts like these:
https://www.homedepot.com/p/Everbilt...0118/204274180

Re: Door threshold hold down screws
 

I always thought sheet metal screws (non stainless ones, too) for that was an odd choice. I think rivnuts would be a great idea.

Re: Door threshold hold down screws
 

Couple thoughts.
First weld up the existing holes just a bit so the stock screws can get a bite.
Or take a strip of 18? gauge sheet metal and tack weld it to the jam and drill new holes?

Re: Door threshold hold down screws
 

I've had success repairing the holes by holding a heavy chunk of steel against the bottom surface of the floor followed by striking the hole from the top with a hammer a few times. This will flatten the metal out, and it will collapse the hole inward.

Re: Door threshold hold down screws
 

So instead of using the original sheet metal type screws for my sill plates I decided to use t nuts like this. They sit in the hole you drilled and give you extra thread for a real threaded bolt. Nut gets welded/glued on the flange to the body underneath and it will tighten better without stripping and it will still look like a truss head from the top. I used shorter bolts than what was in these photos and they are phillips head for a factory look.

Re: Door threshold hold down screws
 

Thanks for the advice! I ended up ordering some #10-24 stainless truss head screws, serrated nuts, and washers from Bolt Depot. Can't believe how much I was overthinking things!

If you guys have never used Bolt Depot, I strongly recommended them. They have all grades of nuts and bolts at very low prices, with dimensions and drawings on each one of them! You can buy small quantities and they don't gouge you on shipping. Every stock number comes in its own labeled zip-lock bag. https://boltdepot.com/Catalog

Re: Door threshold hold down screws
 

Great idea.:metal:

I like those type of tee-nuts.

Re: Door threshold hold down screws
 

I have used Bolt Depot.

I really like their selection and prices.