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.
Captive screws come with Philips, Allen head or standard heads that are designed for usage with drill equipment and ordinary screwdrivers.
Captive screws can be found in several configurations and sizes much like the conventional screws premeditated to be utilized for large number of applications.
Size Range: M2 to M6 in ready stocks
Captive Screws Pan Phillips
Captive Pan Phillips Machine Screws SS-304 A2 B4K31 – Download Datasheet
Captive Pan Phillips Machine Screws SS-316 A4 B6K31 – Download Datasheet
Also available in unified series
Captive Pan Phillips Machine Screws UNC SS-304 A2 B4uK31 – Download Datasheet
Captive Screws Allen Cap
Captive Allen Cap Machine Screws SS-304 A2 B4K49 – Download Datasheet
Captive Allen Cap Machine Screws SS-316 A4 B6K49 – Download Datasheet
Installation of Captive Screws
Using a retaining washer