Hammerhead-, hook-, and T-bolts
Hammerhead screws are named for their characteristically formed heads. Hammerhead screws are often used for attaching anchor rails. A 90┬░ rotation within the guiding rail anchors the screw in the rail, for example because of the head profile or in the case of hook bolts, by snapping into the internal profiles of anchor rails.
Typical applications of hammerhead screws are found in the construction industry. In general, screws are therefore made from corrosion resistant and cold resistant materials.