The present subject matter relates to screws for tool-less assembling of an electronic board on a chassis. In an example implementation, the screw comprises a threaded pin to secure the screw on the electronic board using a nut. The screw also comprises a screw head that fits into a hook on the chassis when the electronic board is assembled on the chassis. The screw further comprises a flange integral to the screw and positioned between the threaded pin and the screw head. The flange is extended radially to support the electronic board and is positioned at a distance from the screw head based on a gap to be maintained between the electronic board and the chassis.