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Mating pins are cylindrical connectors made of metal with cross holes for keys to hold them in place. They evenly distribute sealing pressure and can be used as safety devices. Couplings with drive pins can be easily disassembled and inspected. Specialized coupling pins strengthen joints, and steel coupling pins are used in scaffolding.
A mating pin is a cylindrical surface connector commonly made of metal. Many coupling pins have parallel cross holes through both ends into which keys can be inserted to hold them in place. Custom coupling pins can only be held in place by surface pressure. Coupling pin keys are usually pins of wire or nails bent into a ring shape at one end. The coupled joint is generally designed to be disassembled quickly by pulling the keys off the coupling pin.
The mating pin is commonly installed with half its length in contact with each surface. This position evenly distributes the sealing pressure of the connection and makes the attachment to each surface equal. Using the wrong coupling pins can cause a poor fit and bend or break unexpectedly. Coupling pins that are not secured at either end with wrenches can slip out of position over time.
Coupling pins are sometimes used as safety devices on connected rotating parts. A safety feature is designed to fail under certain conditions. Planned failure of drive pins is a common method of preventing more costly damage to other parts of a system. Fail-safe coupling pins typically resist breakage during normal operation of the coupling joint. Improper installation of a coupling pin can reduce its potential to protect other moving parts from damage.
Couplings with drive pins can usually be disassembled easily for cleaning and maintenance. The workload of some mating pins can warp them with regular use. The kingpins are frequently inspected and may be replaced during scheduled mechanical checkups.
Varieties of specialized coupling pins are used to strengthen connected joints. Pin couplings are hollow barrel connectors that are available in variants with internal and external thread. Internal threading is often used to hold the two halves of a mating pin together. The external thread on the coupling pins is often twisted into the two surfaces to bring them together. Rubber grommets are used regularly to ensure a tight fit on the mating pins.
Scaffoldings are almost always connected with strong steel coupling pins. Quickly assembled metal structures used by construction workers are called scaffolding. The long steel posts have pre-drilled holes into which a coupling pin can be inserted to make a temporary connection. The coupling pins are locked in place with spring loaded tension clips on both ends. Pulling out the coupling pins in the right sequence allows you to safely disassemble the scaffolding structure.
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