The term 'flat-headed fastener' refers to three different types of hardware: a BRAD, a TACK, and a SCREW. A BRAD is a small nail with a flat head, typically used for light-duty tasks such as attaching paper or fabric. A TACK is a short nail with a flat head, usually used for securing carpets or upholstery. A SCREW is a threaded fastener with a flat head, commonly used for joining two pieces of material together. All three of these fasteners are used in a variety of applications, from construction to furniture assembly.