What are Captive Nuts Used for?
Ⅰ. What Are Captive Nuts
Captive nuts, also known as cage or clip nuts, are a type of metal fastener consisting of an elastic outer shell and a square nut. The slotted structure of the outer shell positions the nut within pre-punched holes in sheet metal, while the square nut provides the internal threading for assembly. The gap between the outer shell and the square nut allows for some positional tolerance, compensating for minor misalignments in the installation holes.
Captive nuts can be categorized into three types based on material: all carbon steel, all stainless steel, and half stainless steel. Common surface treatments include nickel plating and zinc plating for carbon steel.
Ⅱ. How to Install Captive Nuts
Captive nuts are very easy to install. To begin, tilt one end of the outer shell and insert it into one side of the pre-punched hole. Then, using a specialized tool (or manually), push the other end of the slot into the opposite side of the hole to complete the installation. The shape of the pre-punched holes can vary, including square, rectangular, and oblique holes. When installed in a rectangular hole, the captive nut can slide along the longer side, adapting to the installation environment. Additionally, when the rack is tilted, the captive nut can be installed at an angle. These nuts are commonly used in communication server cabinets, router cabinets, electrical enclosures, and similar applications.
Ⅲ. How to Select Captive Nuts
When selecting captive nuts, it is crucial to pay attention to the specific plate thickness range for which each nut is designed. You should choose a captive nut that matches the actual plate thickness. If the plate thickness exceeds the design specifications, the nut may not fit properly. Conversely, if the plate thickness is less than the design specifications, the nut may become loose and unstable. Additionally, the selection should also consider the actual dimensions of the pre-punched holes to ensure a proper fit.
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