Standard Broom Threads

I whipped down and into the janitor room to take a peek. Buddy put a piece of cardboard between the screw and the nut and then wrapped a piece of duct tape around the mating joint, Red Green style.

I don't think he got an engineering specification to complete this. So far, I've heard of no casualties.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

Have you tried tracking down taps and dies used for wooden items? I remember seeing these sold in years past.

As you state there are several thread sizes for handles but I've always been told that 3/4-5 ACME is the standard thread form in the US.
Manufacturers take a lot of liberty with this thread. Most of the metal and plastic threads have very loose tolerances and form, especially the plastic ones.

Here is a company that supplies handles to a local manufacturer. You might get some information as to the standard "Standard".

Thanks for your help. It is indeed 3/4-5 ACME. I verified by checking thread profile on a machined part, which had a much better tolerance than the wood, plastic, and cast metal parts I'd been checking.

I figured that there would be a MIL spec along the lines of "Handle, mop, wood", and in fact there are, however they all included various gizmos for attaching a string mop directly. No spec for threads.