Abstract: A slider for a slide fastener is constituted by three members including a body, a pull tab and a cover for pull tab attachment, a concave fitting groove capable of accommodating the lower end face of the cover is provided on the upper surface of the body, a welding projection to be protruded outward is provided in a part of the surface of the lower end face of the cover or a part of the bottom face of the fitting groove, and the welding projection is welded integrally by ultrasonic processing in a state in which the body formed of a resin and the cover are caused to come in contact with each other by pressure such that a fused resin does not overflow from the fitting groove to an external surface, resulting in the fabrication of a slider which can prevent a fused and solidified lump from being formed and can make a good appearance.

Abstract: A button attaching fastener consisting of a button cap and an attachment plug. The button cap has centrally in its rear surface a socket, and the attachment plug has on one end a flange fitted in the socket with a clench portion provided along an outer periphery of the socket clenched over the flange through its substantially entire surface. The clench portion has on its outer surface a plurality of rotation-preventing projections extending radially outwardly from the base of the flange. The rotation-preventing projections serve to prevent the fastener from rotating on a piece of fabric, as of clothing, and also to increase the pulling strength of the attachment plug.