Tongue-and-groove pliers

Water Pump Pliers are Tongs with adjustable slip joint so that can be set differently wide opening angles of the mouth for gripping different sized workpieces. The jaws are interlocked in the rule. The water pump pliers is often mistakenly associated with the pipe wrench or pipe wrench called, even though they are of this type of construction clearly different.

My German- named because they were originally used to tighten the glands to water pump in motor vehicles. In English, are known as " tongue- and- groove pliers '. Because of its universal applicability in quite simple design, they are among the most common types of pliers at all. The most common size is about 250 mm.

The development of water pump pliers is still in motion. In particular, the design of the connection between the two tongs legs and thus the type of opening width adjustment continues to find new forms:

• First predominantly ruled Water Pump Pliers ago with an on-hook and screwed joint.
• A native of the United States, improving the stability of the connection and security against unintentional adjustment was the Water Pump Pliers with groove joint (from the 1930s ). Here grab one or more ridges alternatively into a plurality of grooves.
• From Europe, which has successfully disseminated by the box joint since the 1950s. Here one leg is inserted through a slot in the other leg - he will be taken on two sides for the purpose of high stability.
• Especially with stucked water pump pliers, there are now also frequently with pushbutton adjustment.
• Starting from an initially successful in the U.S. model also Pliers with Self- Setting Function enjoy increasing popularity.

A modification of the water pump pliers, the pliers wrench - with smooth, in any adjustment position parallel to each other cooking surfaces - for backlash free and thus gentle grasping of polygonal bolt heads and nuts of various sizes.