Captive screws basically are specially designed to lock into position in a hole, enabling easy setting up and removing of the attached pieces even without the complete removal of the screw.
A conventional screw typically passes through a clearance hole in one part and then screws into a threaded hole in a second part — so the first part is clamped to the second.
However, when the fastener is unscrewed from the threaded hole in the second component, it can easily separate from the first one.
A captive screw is designed to prevent this from occurring. It can freely rotate within the first component, with some axial movement, but it’s unable to separate from it.
USES : Captive screws are used when fasteners must remain attached to equipment, such as in cover panels. They are a requirement for several machinery safety standards.
They provide a secure joining, and avoid fastener loss or damage that might be caused by a loose part.
Size Range: M2 to M6 in ready stocks