The rubbermaid commercial wood broom handle with threaded metal tip has a self locking feature that secures the broom block to the handle.
Broom handle thread.
One standard shown here has a pitch of 5 threads per inch.
Press the buttons connecting the pieces and the handle quickly breaks down into 3 piece for easy shipping and moving.
Manufacturers take a lot of liberty with this thread.
Swopt 48 steel interchangeable handle only cleaning heads sold separately 5126c6.
Most of the metal and plastic threads have very loose tolerances and form especially the plastic ones.
The handle fits tools needing a standard broom thread or acme thread handle.
Apparently there are two standards common in the usa both based on a 3 4 dowel 0 75 inch or 19mm.
I was able to find a thread gauge and found that a standard broom handle thread is 3 4 5.
4 2 out of 5 stars 17.
I tried several broom handles and handle extensions they don t thread in ore than one turn.
But it is not the right pitch for standard broom handles.
These wooden broom handles are heavier than typical polymer or metal handles and are better suited for moderate to heavy sweeping.
Besides painting i ve seen the same or similar standards used for brooms lightbulb grips pool tools and gutter cleaning poles.
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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.
When assembled the handle has a hole to easily be hung out of the way when not in use.
I have a few paint tools such as telescoping poles that all use the same standard threads.
Rubbermaid commercial lacquered wood threaded tip broom sweep handle 1 5 8 dia x 60 natural rcp6364 3 8 out of 5 stars 13.
X 60 long magnetic pick up tool attachment 3 20 diameter 0 440 thick magnet assembly with acme threaded attachment for standard broom handle 65 pounds pull 1 each 4 1 out of 5 stars 68 14 15 14 15.