Pliers and Plier-Type Cutting Tools
The pliers used most frequently in aircraft repair work are the diagonal, needlenose, and duckbill. The size of pliers indicates their overall length, usually ranging from 5 to 12 inches.
Roundnose pliers are used to crimp metal. They are not made for heavy work because too much pressure will spring the jaws, which are often wrapped to prevent scarring the metal.
Needlenose pliers have half round jaws of varying lengths. They are used to hold objects and make adjust- ments in tight places.
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| NeedleNose Plier |
Duckbill pliers resemble a “duck’s bill” in that the jaws are thin, flat, and shaped like a duck’s bill. They are used exclusively for twisting safety wire.
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| Duckbill Plier |
Diagonal pliers are usually referred to as diagonals or “dikes.” The diagonal is a short-jawed cutter with a blade set at a slight angle on each jaw. This tool can be used to cut wire, rivets, small screws, and cotter pins, besides being practically indispensable in removing or installing safety wire. The duckbill pliers and the diagonal cutting pliers are used extensively in aviation for the job of safety wiring.
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| Diagonal Plier |
Two important rules for using pliers are:
- Do not make pliers work beyond their capacity. The long-nosed variety is especially delicate. It is easy to spring or break them, or nick the edges. If this occurs, they are practically useless.
- Do not use pliers to turn nuts. In just a few seconds, a pair of pliers can damage a nut more than years of service.
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