A shaft nut, also known as a jack nut, is a rubber fastener used to secure components and limit vibration. It is inserted into a pre-drilled hole and tightened with a bolt, causing the rubber body to expand and create a seal. It is commonly used for fragile tools and as engine mounts. The retaining nut is made of brass or stainless steel to prevent rust and corrosion. Other uses include insulating wiring and creating drains. It is important to check compatibility and tighten the nut periodically.
A shaft nut, or jack nut as they are often called, is a fastener used to not only secure one component to another, but also to limit vibration. Made of several types of rubber to suit a variety of uses, the well nut has a wide flange at the top of a barrel body with a nut, commonly made of brass, molded into the bottom. The well nut is inserted into a pre-drilled hole or machined opening until the flange is flush with the surface of the hole. A bolt is threaded through the shaft nut and tightens the embedded nut, causing the body to swell and fill the hole to create a seal. The tight nut has now created a tight seal in the bore which will cushion the attached component due to the rubber body of the nut.
When used in a vibration damping mode, the well nut is typically mounted to a machine leg or mounting bracket and seated in a blind hole. The mounting bolts are then tightened, causing the rubber body of the jack nut to effectively expand and fill the hole and tighten the nut in place. The mounting bolt within the rubber nut can move within the rubber, thereby dampening any vibration. This style of mounting is often used with fragile tools such as compasses and critical gauges and has even been used as engine mounts and engine mounts in all types of vehicles from motorcycles to automobiles.
The retaining nut used within the shaft nut is commonly made from brass or stainless steel. This prevents rust and corrosion from occurring prematurely when used as a water pickup type. Plumbers often use a jack nut to stop the flow of water through a pipe. In this application, the well nut is inserted into the pipe, often while the water continues to flow through the pipe; when the nut is tightened, the nut expands against the pipe walls and the water is effectively sealed inside the pipe. The nut is easily removed should the flow through the hose need to be restored.
Other uses for the sump nut are to insulate electrical wiring as it passes through a steel firewall in a vehicle, and to create a drain or outlet in a metal or plastic container. It is advisable to check the compatibility of the rubber with the intended use of the nut and make sure that there are no problems. When used in a vibration damping application, it is best to check the nut from time to time to ensure it has not become loose over time.
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