Applications: Mounting: The holes can be used to fasten the nut to a surface using screws or bolts. Secure Attachment: The four holes can be used to prevent rotation when tightening the nut against another component. Specialized Tools: The holes can provide access for specialized wrenches or spanners designed to engage with the nut's shape. Applications where vibration resistance is required: The four holes can be used to ensure that the nut is secured tightly and does not vibrate loose.
Variations: DIN 547: A specific standard for round nuts with drilled holes in one face. Heat-set inserts: These round nuts can be designed for heat-insertion into plastic components.