powered by CADENAS

Social Share

Adjustable spanner (13870 views - Mechanical Engineering)

An adjustable spanner (UK, and most other English-speaking countries) or adjustable wrench (US and Canada) is an open-end wrench with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner. Several other names are in use, including the US trademark crescent wrench.
Go to Article

Explanation by Hotspot Model

Adjustable spanner

Adjustable spanner

Adjustable spanner

An adjustable spanner (UK, and most other English-speaking countries) or adjustable wrench (US and Canada) is an open-end wrench with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner.[1] Several other names are in use, including the US trademark crescent wrench.[2][3]

Forms and names

In many European as well as Middle Eastern countries (e.g. France, Germany, Portugal, Spain, Italy, Syria, Lebanon, Turkey, etc.) the adjustable wrench is called an English key.[citation needed] English engineer Richard Clyburn is credited with inventing an adjustable spanner in 1842.[4] Another English engineer, Edwin Beard Budding, is also credited with the invention.[5][6] Improvements followed: on 22 September 1885 Enoch Harris received US patent 326868[7] for his spanner that permitted both the jaw width and the angle of the handles to be adjusted and locked. Other countries, like Denmark, Poland and Israel, refer to it as a Swedish key.[citation needed] Swedish company Bahco attributes an improved design, in 1891 or 1892, to Swedish inventor Johan Petter Johansson.[8][9] who in 1892 received a patent[10] Johansson's spanner was a further development of Clyburn's original "screw spanner".[citation needed] In some countries (e.g. Czech Republic, Egypt, Greece, Hungary, Serbia, Iran, Slovakia, Slovenia, Poland, Croatia, Romania, and Bulgaria) it is called "French key" (in Poland, "Swedish" or "French" key depending on type).[citation needed] In Canada and the United States, the tool is known as a Crescent wrench or an adjustable wrench.[2][3]

There are many forms of adjustable spanners, from the taper locking spanners which needed a hammer to set the movable jaw to the size of the nut, to the modern screw adjusted spanner. Some adjustable spanners automatically adjust to the size of the nut. Simpler models use a serrated edge to lock the movable jaw to size, while more sophisticated versions are digital types that use sheets or feelers to set the size.

The fixed jaw can withstand bending stress far better than can the movable jaw, because the latter is supported only by the flat surfaces on either side of the guide slot, not the full thickness of the tool. The tool is therefore usually angled so that the movable jaw's area of contact is closer to the body of the tool, which means less bending stress.

Monkey wrenches are another type of adjustable spanner with a long history; the origin of the name is unclear.[11]

The type of straight adjustable spanner with jaws at right angles to the handle shown here as an "English Key"[not in citation given] is mainly called a "King Dick"[not in citation given] spanner in the United Kingdom because of a popular British brand of small, handy and reliable adjustable spanner used throughout the 1900s and used in great numbers during World War II.[12]

A popular type of adjustable spanner has a base and jaws that form four (4) sides of a hexagon, and is therefore particularly suited for hexagonal nuts ("hex nuts") and hexagonal headed ("hex head") cap screws and bolts.

In the United States and Canada, the adjustable spanner (adjustable wrench) is colloquially referred to as a "crescent wrench" due to the widespread Crescent brand of adjustable wrenches. The Crescent brand of hand tools is owned and marketed by Apex Tool Group, LLC. In some parts of Europe, adjustable spanners are often called a Bahco.[9] This term refers to the company of the Swedish inventor Johan Petter Johansson, which was originally called B.A. (Bernt August) Hjort & Company. The Swedes themselves call the key "skiftnyckel" which is translated into adjustable key (shifting key).[citation needed]


See also



This article uses material from the Wikipedia article "Adjustable spanner", which is released under the Creative Commons Attribution-Share-Alike License 3.0. There is a list of all authors in Wikipedia

Mechanical Engineering

AutoCAD, SolidWorks, Autodesk Inventor, FreeCAD, Catia, Siemens NX, PTC Creo, Siemens Solid Edge, Microstation, TurboCAD, Draftsight, IronCAD, Spaceclaim, VariCAD, OnShape, IntelliCAD,T-FLEX, VariCAD, TenadoCAD, ProgeCAD, Cadra, ME10, Medusa, Designspark, KeyCreator, Caddy, GstarCAD, Varimetrix, ASCON Kompas-3D, Free Download, Autocad, 2D Library, DXF, DWG, 2D drawing, 3D digital library, STEP, IGES, 3D CAD Models, 3D files, CAD library, 3D CAD files, BeckerCAD, MegaCAD, Topsolid Missler, Vero VisiCAD, Acis SAT, Cimatron, Cadceus, Solidthinking, Unigraphics, Cadkey, ZWCAD, Alibre, Cocreate, MasterCAM, QCAD.org, QCAD, NanoCAD