A standard hex bolt looks like a flange nut from one side but the bottom of the nut is widened into a circular flange through creating a bell-like shape. The fastener is used widely for different applications, which depends on the style of the head. Some of its variants do not offer premium-locking capabilities but still have some engaging benefits when used properly in the applications. In addition, it provides better grip options on the surface of the joints. They act like a non spinning washer because at the end they have a wide flange. It distributes the pressure of the nut over the part being secured. They are also known from the names spin lock, tooth, or face nuts, etc.