Besides painting i ve seen the same or similar standards used for brooms lightbulb grips pool tools and gutter cleaning poles.
Broom handle thread.
Manufacturers take a lot of liberty with this thread.
4 2 out of 5 stars 17.
Apparently there are two standards common in the usa both based on a 3 4 dowel 0 75 inch or 19mm.
Boardwalk 137 heavy duty threaded end lacquered hardwood broom handle 1 1 8 inch dia.
Press the buttons connecting the pieces and the handle quickly breaks down into 3 piece for easy shipping and moving.
The rubbermaid commercial wood broom handle with threaded metal tip has a self locking feature that secures the broom block to the handle.
I was able to find a thread gauge and found that a standard broom handle thread is 3 4 5.
I have a few paint tools such as telescoping poles that all use the same standard threads.
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I tried several broom handles and handle extensions they don t thread in ore than one turn.
When assembled the handle has a hole to easily be hung out of the way when not in use.
But it is not the right pitch for standard broom handles.
2 pc metal threaded handle tips for 3 4 wood or metal poles heavy duty aluminum buy 3 get 1 free extension pole tip threaded tip replacement ultra threaded tip repair kit.
One standard shown here has a pitch of 5 threads per inch.
Rubbermaid commercial threaded broom handle 54 by rubbermaid commercial products.
Most of the metal and plastic threads have very loose tolerances and form especially the plastic ones.
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.
These wooden broom handles are heavier than typical polymer or metal handles and are better suited for moderate to heavy sweeping.
The handle fits tools needing a standard broom thread or acme thread handle.