ABOUT THE Pan Head Screw :
One versatile type of screw used primarily for metal-to-metal applications are pan head screws. This utilitarian screw features a broad head with rounded edges that some compare to an upside down frying pan and requires a tapped hole.
Framing Screws are used to connect light-gauge sheet metal parts together. They are manufactured with proper recess drives and tapered pan heads and are finished with a black phosphate coating.
Pan head screws are a common head type of non-countersunk screw head used in wood screws, self-tapping screws, self-drilling screws, and machine screws. They have wide heads, a flat bearing surface, high vertical, chamfered, or curved sides, and a flat or slightly domed top surface with a recessed socket.The top of these screws have a very round finish, forming a half sphere. This makes them a common choice for applications such as mirrors.