Three parts of pliers

A pair of handles for holding. Ergonomically designed pliers handle for a more secure and comfortable grip. Attachment axis, this is the attachment axis point of the pliers. The connection point must move smoothly, without any looseness, so that the pliers can be opened or closed easily with one hand. The pliers have clamping jaws or cutting edges. The blades of the pliers are finely ground to a suitable shape. The two cutting edges (with springs) must be very sharp and close precisely to each other for easy cutting of the wire.

This converts a small external force (such as the hand force exerted on the pliers arm) into a large work force, so that the pliers can effectively clamp or cut. As the external force applied to the pliers arm increases with the leverage ratio, the force of the pliers mouth produces an external force that grips the movement. If a large external force is to be generated, the distance from the center of the riveting position of the pliers to the handle must be as long as possible, and the distance from the clamping opening or cutting opening to the riveting center must be as short as possible. However, many pliers do not increase hand strength to a large extent, because they just make it easier to work in difficult places, such as: electronic equipment assembly and electronic and precision engineering applications.

Pliers are usually forged from alloyed and unalloyed structural steels. For general pliers, it is made of high-quality carbon structural steel with 0.45% carbon content. High quality and heavy duty pliers are made of high carbon content and/or alloying elements such as chromium or vanadium.

The origins of pliers in Europe can be traced back to more than a thousand years BC, when people first started to cast iron. During the casting process, pliers can be used to hold hot iron blocks. The shape of the forging pliers of the past has been retained to this day with little change. The variety of pliers expanded with the development of handicrafts, commerce and industrialization. There are more than 100 kinds of general-purpose pliers. Pliers for special applications are also increasing. Of course, these special pliers are not often available in the general-purpose range. The only one in Germany, the monthly output of pliers exceeds 1 million, about 50% of which is exported. The vast majority of them are general-purpose pliers, such as cutters, wire cutters, and water pump pliers.