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Trouble matching a screw - are there sizes I may be overlooking?

Home Improvement Asked on March 31, 2021

I am trying to mount a new light fixture which has a decorative head for the screws that hold the fixture to the plate.

One of the screws is too long for the existing fixture, so I attempted to look for the same screw but 1/4" in shorter.

I took the screw and decorative nut to the hardware store to try matching the size. I am 99% sure the screw is 32 threads/inch by comparison with an 8-32 screw at the store. However, the 8-32 screw is barely too large for the decorative nut, and a 6-32 is too small.

I looked into metric screws, and M4-0.70 is too large and M3 too small.

What might I be missing here? My other option is to just cut the existing screw, but I’d rather figure out what’s going on first, just in case.

One Answer

If your located in the States or Canada most light fixture screws will be SAE or imperial measurements. The most common screw size used for fixtures will be a 8/32. The next sizes closest to this are the smaller 6/32 and the larger 10/24.

Why not shorten the original screw? Thread the nut down the screw to below the length yyou want it to be. Cut the shaft to the desired length. Unthread the nut so it straightens the cut hreads. Voila!

Answered by ojait on March 31, 2021

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