Phillips Flat Head machine screws have a flat top with a conical bearing surface and are commonly used in countersunk holes where the screw head must sit...
Combo Round Head Machine Screws have a round head which can be driven using either a Phillips or slotted screwdriver. They are primarily used to fasten...
Slotted Truss Head Machine Screws have a slotted head requiring a flat-head screwdriver and is commonly used in applications where minimal clearance exists.