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Jackscrews are a series of accessory products of the D Sub D shaped connector. Jackscrews are primarily used to mount and secure D shaped plugs or receptacles to printed circuit boards, or mounting panels such as in computer peripheral applications. Jackscrews are a quality improvement from the older thumb screws.

The jackscrew consists of two parts, the head and the spindle. The thread on the spindle has a right-hand thread, which is the most commonly used thread type. There are still some variants that use a left-hand thread for the spindle, but the right-hand thread is more common these days. The head can be a variety of shapes depending on the application, usually a slotted head or a Phillips head depending on what type of screwdriver is used.

Jackscrews have a number of different applications. The most common application is in securing circuit boards to mounting panels. The jackscrews are used to firmly secure the circuit board to the panel so that it does not become loose or move about during use. Jackscrews are often used to mount D-sub connectors and other components to the boards. Jackscrews can also be used for securing mechanical components such as fan shrouds or other components.

The working principle of jackscrews is essentially the same as any other screw. When submitting the screw to rotation, a force is applied on two opposing faces. This force creates a friction between the two surfaces which allows the screw to turn. This force is generated both when the screw is tightened and when it is loosened, allowing for controlled tightening and loosening of the screw.

This is done through the use of a driver, either a flat head or a Phillips head. This depends on the type of jackscrew being used. It also depends on the thread type, whether it is a right-hand thread or a left-hand thread. The driver is then used to turn the screw and as it does, the two opposing faces provide friction which results in the screw either tightening or loosening. The driver also ensures that the screw is held firmly in place so that it does not rotate or slip out of its position.

As a result, the jackscrew is a simple yet reliable and efficient way of securing and mounting components and panels. The thumb screws are now being obsolesced because the jackscrews are far more reliable and long lasting. Jackscrews provide a secure and sturdy mount for components and are a great way of reducing vibration and noise while at the same time providing a secure grip.

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