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 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
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.
About the time I had mastered getting the toothpaste back in the tube, then
As many have suggested ...cut the screws with the threaded hole "screw
cutters) that are present on most good pair of wire strippers.
Also as many have suggested..... "chinese 8-32"
A proper 8-32 is about .163" to .157" od
a 4mm screw is about .157" to .151" od but the standard thread pitch
(mod) is .7mm per thread which is about 36.3 tpi
so I'm guessing that the Chinese mfr just uses the 4mm cold headed
blank and tweaks the threading machine to do 32 tpi instead of 36.3.
The result is "close enough"........ a screw that threads into a
standard 8-32 hole but is rather sloppy being about .005" to .010"
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