Shear Nuts are conical nuts with coarse threads designed for a permanent installation where preventing tampering with the fastener assembly is important. Shear nuts get their name because of how they are installed. They require no special tool to install; however, removal will be challenging, if not impossible. Each nut consists of a conical section topped by a thin, threadless standard hex nut that snaps or shears off when the torque exceeds a certain point on the nut. The finished result resembles a Tri-Groove or Trident Nut, only it does not have the grooves for installation or removal.
Shear Nuts are commonly used on signs in hospitals, public spaces, playgrounds, schools, and correctional facilities to secure various equipment and protect against unwanted removal.