Higbee cut

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Higbee cut on male thread Higbee cut.svg
Higbee cut on male thread

A Higbee cut is a specific modification added to the end of a screw thread to create a blunt start, replacing the sharp end typically found on unmodified threads. Named after its inventor Clinton Higbee, this feature reduces the risk of cross-threading when applied to both male and female threads. A blunt-start thread with a Higbee cut is also referred to as a convoluted thread. [1]

Contents

History

Clinton Higbee invented and patented the blunt start thread in 1891. [2]

Common uses

Fire service

The Higbee cut is commonly used on the threads of fire hose couplings. [3] The cut's presence and the thread's starting point are often marked on couplings to facilitate proper assembly. [4]

Thread gauges

Gauging used to inspect machine threads often includes a Higbee cut. [5]

References

  1. ↑ ASME B1.7-2006, Screw Threads: Nomenclature, Definitions, and Letter Symbols, The American Society of Mechanical Engineers, 2006-11-17, ISBN   0791830152
  2. ↑ US 447775,Clinton A. Higbee,"Screw bolt and nut",issued 1891-03-10
  3. ↑ "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.
  4. ↑ Wildland Fire Hose Guide. United States Department of Agriculture: Forest Service. August 1995. p. 5.{{cite book}}: CS1 maint: publisher location (link)
  5. ↑ "Internal Threads". Quality Magazine. 2013-01-13. Archived from the original on 2020-11-30. Retrieved 2021-03-04.
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