Thumbscrew (fastener)

A thumbscrew is a specialized type of screw with either a tall head and ridged or knurled sides, or a flat, vertical head. They are intended to be tightened and loosened by hand. They are often cut for Phillips head or slotted screwdrivers as well.

Sometimes a wingnut (a nut with two large metal wings so it can be tightened and loosened by hand without a wrench) is called a thumbscrew.

See also

• Computer case screws