Stud Removal with Double Nuts

[rgsparber]

I have updated the article with the observation from ductape and ideas from Toolmaker51. Thanks!

Rick

[Toolmaker51]

Thank You, Rick.
I appreciate being cited in your paper.

The double nut and washer bit goes way back. That's how we pulled mold components; good sized stud (fine threads), nuts + washer, and a bridge straddling the part. In that use, a third nut and washer seated on the bridge work to pull core from position. Identical to automotive type screw operated pullers. They were mostly one-off tools stored under the job number.

[arktinkerer]

Two quick thoughts after reading--
Thread lock between the nuts.
Inside star lock washer between the nuts.

Each probably has plusses and minuses in practice.

[Frank S]

If you absolutely need to lock 2 nuts together for stud removal you can use what is called Nord-lock wedge washers. Simply place the 2 halves together between the buts then turn the bottom nut to remove the stud. for every other method even with the wedge washers it helps to hold a slight resistance on the top nut with a wrench I usually don't use anything between the nuts but have stacked 3 nuts together then with a wrench on the top and another on the bottom squeeze them like a plier while turning. The stud will either come out or twist off if you have enough grip
note, the only way to remove a nut with wedge washers under the nut will be to fuse the 2 halves together, otherwise there is a real risk of 1 stretching the bolt threads 2 twisting the bolt off, tack welding works best for me.

[ductape]

Happy to help. Investigating things like this can be very interesting.