Pliers wrench
A pliers wrench is a combination of an adjusting wrench and gripping pliers with adjustable jaw width and smooth gripping jaws. In contrast to water pump pliers, for example , the gripping jaws of the pliers wrench are guided approximately parallel in every plier position.
Designs like the pliers shown on the right achieve good parallelism in every position thanks to the linear guidance of the jaws. Other designs, like ordinary pliers, only have a swivel joint . With these pliers, a correspondingly adapted adjustment option is intended to ensure that the jaws also lie parallel to the edges of the workpiece with the intended mouth widths. If the edges to be gripped are at a different distance from one another, the jaws are no longer parallel and then only grip the corners of the workpiece instead of lying flat.
Pliers wrenches can also be used to grip nuts and screw heads with a larger diameter, which would otherwise require a large and heavy wrench . One pliers wrench can replace a number of wrenches with different jaw widths. The torque to be applied is limited by the length of the handles of the pliers. (Larger wrenches, on the other hand, are often robust enough to be able to enlarge the lever arm further by extending the handle.)
Pliers of this type are also known as valve pliers . With the smooth, parallel gripping jaws, workpieces with parallel edges, such as the chrome-plated union nuts of taps and other fittings, can be gently gripped. As fittings pliers but also pliers with easy swivel and cranked jaws are called, which have plastic jaws to the surface of valves to avoid scratching. These can often only transmit a limited torque and are usually not suitable for loosening tight screw connections.
Web links
Individual evidence
- ↑ KNIPEX (86 03 250) pliers wrench 250 mm - RUBART - EAN 4003773033837 - KNI-8603250. In: rubart.de. Retrieved April 12, 2015 .