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An expansion or well nut consists of a flanged neoprene bushing with a threaded nut embedded in the non flanged end. It is used in blind bolt holes to fasten a piece and seal the bolt hole. The nut is inserted into the hole flange side up, as the bolt is screwed into the nut the rubber on the other side of the hole expands and seals the bolt hole.
From the Manufacturer
An expansion or well nut consists of a flanged neoprene bushing with a threaded nut embedded in the non flanged end. It is used in blind bolt holes to fasten a piece and seal the bolt hole. The nut is inserted into the hole flange side up, as the bolt is screwed into the nut the rubber on the other side of the hole expands and seals the bolt hole.
Bud Borland
Reviewed in the United States on February 5, 2022
Work very well just go slow and reduce torque when it is tightening so you don't pull it through.
Weston Jagger
Reviewed in the United States on February 20, 2019
Replaced old expansion nuts with new ones. Just a FYI on installing these. It's easy to over tighten these. It didn't ruin them or any thing just pulled the nut & rubber thru the hole in the cab roof. They were tight installing into the roof. I was pleased that I didn't destroy the one or two I had done that to.
thom's brain
Reviewed in the United States on February 6, 2018
Read the description and look at the picture and it's safe to assume that you're getting a well nut for a 5/8-inch diameter hole. You're not. You're getting a 5/8 inch LONG, skinny well nut. Since you buy well nuts to put in HOLES, one would expect the HOLE diameter to be what was described. I couldn't use these and had to return them. Seller, how can we possibly purchase the right hardware without you describing the diameter of the product in the title?
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