Projection Height Applications

If the stud is not driven to the bottom of the tapped hole, and threads are still visible above the surface of the workpiece, you are working with a projection height application.

(Stud shown completely driven to required height)

Torque Applications

If the stud is driven to the bottom of the hole, or until the shoulder is flush with the workpiece, you are working with a torque application.

(Studs shown driven to torque)