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What is a Screw Joint?

By Troy Holmes
Updated May 17, 2024
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In mechanical engineering, there are several types of bolts and screw designs. A screw joint is a special type of sleeve joint that enables screws to be tightened into surrounding joint sleeves. These are often used for metal rod assembly or corners that require a threaded screw for structural stability.

A screw joint is often seen in pre-assembled furniture or mechanical equipment. The joint area is a pre-threaded hole that is used for the assembly section of the furniture. This hole is used to attach two pieces of material. A joint design enables the screw to be tightened to the maximum depth of the pre-threaded joint hole.

Screw joints can be used with a variety of materials, including aluminum, brass, plastic, steel, and wood. Many drain pipes and plumbing fixtures use a screw joint. This is most often seen in PVC pipes under sinks or cabinets. The screw joint keeps the adjoining pipes securely fastened, which helps prevent leaks in pipe traps under sinks.

A ball screw joint is another example of a joint screw used in manufacturing equipment. These can be found in automobile steering systems. This form of screw joint is unique because one end includes a ball joint that is attached to a screwing mechanism.

The machine-screw joint is a joint designed specifically for wood. This type of screw is stronger then a standard screw because the wood is pre-threaded to support the screw, which makes it less susceptible to splitting or cracking.

Most water faucets use special screens attached to the end of the waterspout. These screens are connected with screw joint fittings that attach the water faucet. Using a joint design makes the faucet connection durable and less likely to leak.

Another common application for screw joints is metal pole assemble. Long metal poles are easily connected with a screw joint, which allows two poles to be screwed together. This is often seen in outdoor basketball hoops and flagpoles that require assembly from the manufacturer.

Small plastic flagstaffs also use screw joints. These small rods are assembled with brass joint inserts that enable the connection of two poles to form a staff. This joint design makes it easy to attach multiple rods, which can make longer staffs.

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