I have a wall fixture that's held up with two machine screws. I'm changing the way it's mounted and need shorter screws. But the screws are smaller than a #8/32 and bigger than a #6/32. I even tried metric and couldn't find a match. What size might this be?
You could use a Klein triple tap tool to cut 8/32 threads into the holes and use any length 8/32 screws you want. The tool isn't that expensive and you would find it to be one of the most useful tools in your collection. Besides most wire strippers have threaded holes in them for cutting standard screws without deforming the threads.
*I see this often. I call them the Chinese 8/32. I have had success retapping the holes and using real 8/32 screws. You could also try cutting the screws that you have.
I have a Klein 627-20, it's a six in one tap tool. Bought that probably
25 years ago and it sure has come in handy. What is amazing is that Klein still sells replacement taps for both of ours. Nothing like a great tool and a great tool company.
I've been carrying the same six in one Klein in my tool bag for at least 25 years. I may have replaced one broken tap in that time. On of my new (in the last decade) favorites is a set of drill point taps from Greenlee.
As others have suggested you can upsize the screw to 8X32 or take the screw into the hardware store and ask to use there pitch gauge. These are little metal plates that have vee notches in them that you can measure the thread pitch.
In standard threads the pitch is measured in the number of threads per inch. In metric threads the pitch is measured by the distance from thread to thread in millimeters.
Once you have that measurement you then measure the major diameter and figure out the size of the screw.
Another option to consider is just to get some self tapping 8X32 screws and let them cut their own threads.
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