In the United States, most threaded handles for brooms, paint rollers, extension poles for window washing brushes and squeegees, and so forth, have threads ¾ inch in diameter, 5 threads per inch, Acme form. Consequently a broom handle can be screwed into a paint roller, a window washing extension pole into a broom, and so on.
The tolerances are very loose; some of the molded plastic threads do not use the Acme form at all, but they function satisfactorily.
Threaded broom handles in other countries have quite different threads, often tapered. Italian manufacturers provide illustrations of various threads at www.brooms.it/HandlesTechData.htm or www.spinelli-group.com/thread.htm
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Last revised: 17 January 2005.