VILLA MACHINE ASSOCIATES INC.

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DESIGN FOR MANUFACTURING: THREAD HIGBEE

by: Matthew Viau on Sep 16, 2016


In some applications a blunt start thread (AKA a thread higbee) is helpful, or even necessary. Firefighting hoses use higbees to allow for easy coupling of the hose connections. The connections are marked with a groove where they should align for an easy thread start. No one needs a cross-threaded connector when they're fighting a fire. Pipes threaded for oil drilling often require a thread higbee. The oil drilling business is highly competitive and lost time from an expensive, cross-threaded pipe connection is unacceptable. Many of the go/no-go gauges used for checking threads have a higbee to help clear chips away from the thread and once again prevent cross threading.

TL;DR - Blunt start threads prevent cross threading.

An ACME thread with a blunt start (higbee)

design for manufacturing thread higbee

An ACME thread with a chamfered start

design for manufacturing thread chamfer

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