Abstract: A torque nut with an axially deformable projection protruding from the axially inner end face of the torque nut. The torque nut may be assembled as part of a compression fitting including one or more ferrules for engaging a tube held within the torque nut and a fitting body onto which the torque nut can be threaded. The axially deformable projection will engage an opposing face on the fitting body and this allows a person tightening the torque nut to to feel when the torque nut is madeup to prevent undermaking or overmaking the torque nut. When the axially deformable projection engages the fitting body, there will be an abrupt increase in torque needed to tighten the torque nut on the fitting body after only partial axial deformation of the axially deformable projection relative to the axially inner end face of the torque nut.

Abstract: A torque nut with an axially deformable projection protruding from the axially inner end face of the torque nut. The torque nut may be assembled as part of a compression fitting including one or more ferrules for engaging a tube held within the torque nut and a fitting body onto which the torque nut can be threaded. The axially deformable projection will engage an opposing face on the fitting body and this allows a person tightening the torque nut to to feel when the torque nut is madeup to prevent undermaking or overmaking the torque nut. When the axially deformable projection engages the fitting body, there will be an abrupt increase in torque needed to tighten the torque nut on the fitting body after only partial axial deformation of the axially deformable projection relative to the axially inner end face of the torque nut.