Solid Brass Slotted Flat Head Machine screws are ASME standards specific. These fasteners are installed with flat or slotted screwdriver. Flat Head Machine Screws feature a flat, countersunk head that runs flush with the installation surface. Slotted head machine screws are often used with nuts as well as driven into tapped holes. In practice, they tend to be mostly available in smaller sizes and the smaller sizes are referred to as screws, or less ambiguously as machine screws, although some kinds of machine screw can be referred to as stove bolts.
Please note that color and sheen may vary for brass and silicon bronze fasteners.