Higbee cut

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.

History

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

Common uses

Fire service

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

Thread gauges

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