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A Higbee cut is a specific cut added to a screw thread to produce a blunt start, instead of the sharp end of the unmodified screw thread. It is named for its inventor Clinton Higbee. The presence of a Higbee cut on both male and female threads eliminates the chance of cross threading. A blunt start thread possessing a Higbee cut is also known as a convoluted thread.
Common Uses
Fire service
The Higbee cut is commonly used on fire hose couplings' threads. The presence of the Higbee cut and the location of the start of the thread are often marked on couplings to assist with assembly.
Thread gauges
Gauging used to inspect machine threads often includes a Higbee cut.
History
Clinton Higbee invented and patented the blunt start thread in 1891.
References
- ASME B1.7-2006, Screw Threads: Nomenclature, Definitions, and Letter Symbols, The American Society of Mechanical Engineers, 2006-11-17, ISBN 0791830152
- "The Higbee Thread". Fire Engineering Magazine. Vol. 1895 16, no. 13. 1895-03-30. Archived from the original on 2021-03-05. Retrieved 2021-03-04.
- Wildland Fire Hose Guide. United States Department of Agriculture: Forest Service. August 1995. p. 5.
- "Internal Threads". Quality Magazine. 2013-01-13. Archived from the original on 2020-11-30. Retrieved 2021-03-04.
- US 447775, Clinton A. Higbee, "Screw bolt and nut", issued 1891-03-10