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Jackscrews are a type of fastener used in the mounting and adjustment of D-sub, D-shaped connectors. A jackscrew serves as an adjustable fastener in connectors that require precise alignment between the mating pairs of connectors. Jackscrews provide a simple, cost-effective solution for the alignment and secure mounting of D-connectors used in many electronic applications.

Jackscrews come in a variety of styles to root fit a variety of applications. Generally speaking, jackscrews are threaded fasteners used in pairs, each comprising of a threaded metal shaft with a square or hexagonal head and a captive nut made from metal or plastic. The threads can be either machine cut on the shaft or rolled for extra strength. The size of the head varies from a small screw head to a larger head, depending on the size of the poppet.

The main application fields for jackscrews include the tightening and alignment of D sub connector halves. The primary working principle is that when a jackscrew is tightened, the connector halves are pulled together, both centering and correctly aligning them. The aforementioned nut acts as a stop against the end of the connector, preventing the jackscrew thread from tearing out the soft metal of the D sub connector. This ensures a secure and precise alignment of the two connector halves when mated.

Jackscrews are often specified in applications which require robust assembly and increased strain relief. For this purpose, jackscrews with spacers and cushion sleeves are used, which can also provide electrical isolation between the connecting parts. Jackscrew assemblies are also used in instrumentation and signal processing applications.

When selecting a jackscrew, the size and thread pitch of the fasteners should match the threaded receivers in the connector halves. The poppet should also be selected based on the application and the connector design. The common types of poppets include, Knurled, Paiget Point, and Fillister head. Additionally, screwdrivers used to tighten jackscrews should be torqued to the manufacturer’s specifications to ensure quality and reliability of the connection.

In summary, jackscrews are a simple and cost-effective solution for the alignment and secure mounting of D-sub, D-shaped connectors used in many electronic applications. They are robust and have versatile applications, from tightening and alignment of connectors to instrumentation and signal processing. Therefore, they are an essential accessory when considering the purchase of a D connector.

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