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A cable tie, also known as a zip tie or tie-wrap, is a type of fastener, designed for bunching electric cables or wires and to organize cables and wires, but with a wide variety of other applications.
In its common form, the nylon cable tie consists of a tape section with triangular teeth that slope in one direction. The head of the cable tie has a slot with a flexible pawl that irreversibly rides up the slope of these teeth when the tape is inserted. The pawl engages the backside of these teeth to stop removal of the tape.
Design and use 
In its most popular form, a cable tie consists of a sturdy nylon tape with an integrated gear rack, and on one end a ratchet within a small open case. Once the pointed tip of the cable tie has been pulled through the case and past the ratchet, it is prevented from being pulled back; the resulting loop may only be pulled tighter. This allows several cables to be bound together into a cable tree.
A cable tie tensioning device or tool may be used to apply a cable tie with a specific degree of tension. The tool may cut off the extra tail flush with the head in order to avoid a sharp edge which might otherwise cause injury.
In order to increase resistance to ultraviolet light in outdoor applications, a specific grade of nylon containing a minimum of 2% carbon black is used to protect the polymer chains and extend the cable tie's service life. Blue cable ties are supplied to the food industry and contain a metal additive so they can be detected by industrial metal detectors. Cable ties made of ETFE (Tefzel) are used in radiation-rich environments. Red cable ties made of ECTFE (Halar) are used for plenum cabling.
Cable ties can be used as makeshift handcuffs. Specially constructed physical restraints called PlastiCuffs, based on the cable tie design, are used by police and military to restrain prisoners. Cable ties are also commonly used to prevent hubcaps (also known as wheel trims) from falling off a moving vehicle, and some are sold specifically for this purpose.
Cable ties were first invented by Thomas & Betts, an electrical company, in 1958 under the brand name Ty-Rap. Initially they were designed for airplane wire harnesses. The original design used a metal tooth, and these can still be obtained. Thomas & Betts and others, e.g. Panduit and Hellermann, later changed to the nylon/plastic design.
The design has over the years been extended and developed into numerous spin-off products.
Cable ties are generally viewed as single-use devices; they are typically cut off rather than loosened and reused. However, if a closed loop needs to be opened again, rather than destroying the cable tie by cutting, it may be possible to release the ratchet from the rack. While some cable ties are designed for reuse with a tab that releases the ratchet, in most cases a sewing needle or similar object (for example a small screwdriver) will need to be interposed between the ratchet and the rack. Ties reused in this way will be weaker than new ones.
To open without cutting, the ratchet box can be crushed vertically using pliers.
Other methods of bundling cable together securely and semi-permanently include cable lacing, binding knots such as the surgeon's knot or constrictor knot, Velcro brand hook-and-loop strips, conveyor belt hooks, twist ties, Rapstrap fasteners, metal buckle clips or Cablox cable management.
See also 
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