Hook wrench

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A hook wrench is a hand tool for tightening or loosening special connecting elements such as locknuts or covers . The hook (of form A) or the round pin (of form B) at the end of the curved part of the hook wrench is inserted into grooves or radial bores on the surface of the connecting element. At the height of the handle , the arch is supported against the connecting element. The torque is transmitted via these two contact points .

  • Hook wrench

  • Different hook wrenches

  • Universal tool with integrated hook wrench (below).

  • Hydrant wrench with integrated hook wrench (top center).

Hook wrenches are mainly used when there are high requirements for a round external shape of the connecting element and, for example, the application of two parallel surfaces on which a wrench could be placed is not possible. The size of the tool, which is often marked in the handle, does not depend on the thread size of the locknut, but on its outer diameter.

Locknut (3D drawing); A hook wrench can be placed in one of the four external grooves.

A locknut wrench can also be used to tighten or loosen locknuts if the locknut is on an axially accessible shaft end.

Since hook wrenches are also used to tighten and loosen so-called milk pipe screw connections, matching hook wrenches are also referred to as milk pipe wrenches .

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