Slotted truss head machine screws are threaded fasteners with a slotted drive and a wide, rounded head that's also known as a truss head or mushroom head:
Head:The head is wider and has a lower profile than other types of screws, with an undercut bottom and a rounded dome top.
Drive: The drive is slotted, meaning it has a slot in the head. Slotted drive screws are easy to remove and can be loosened with a knife or other flat component.
Use: Slotted truss head machine screws are often used in applications that require a secure hold with minimal surface damage, such as sheet metal work.
Truss head screws are also known as mushroom head screws. They are strong and have a wide head that distributes the load while protecting the material from damage.