Hirth joint
（重定向自Hirth coupling）
![Hirth joint made from anodized aluminum to show the meshing of the teeth](/Images/godic/202501/18/Hirth_Verzahnungsringe3301.JPG")
![Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset](/Images/godic/202501/18/Hirth_joint3301.jpg")
A Hirth joint or Hirth coupling is a type of mechanical connection named after its developer Albert Hirth. It is used to connect two pieces of a shaft together and is characterized by tapered teeth that mesh together on the end faces of each half shaft.