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Flat wrenches

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Wrenches

Wrenches are mechanical assembly tools available in many different sizes. They are used to tighten or loosen a wide range of bolt connections of varying dimensions and strengths. They can be used on hexagonal bolts and hexagonal nuts.

Wrench design

Open-end wrenches are uniform in material and consist of a working part, called the jaws, and a grip, called the handle. The jaws are angled in relation to the axis of the wrench. The most common version, in which the axis of the working head is set at an angle of 15° (most versions of the wrench) to the longitudinal axis of the tool. This geometry allows the wrench to be turned in small spaces. As a result of improvements in design, open-end wrenches have been developed with the working head set at a large angle, such as 75° or 82.5°. Open-end wrenches are manufactured from chrome vanadium steel (CrV) by forging, heat treatment and machining. The manufacturing standards are defined by ISO 691, ISO 7738, ISO 3318, ISO 1711-1 and DIN 3113. Wrenches are dimensioned in metric and imperial dimensions. In the metric system, the jaw opening range of the wrenches is 3.5-50 mm and in the inch system, the jaw opening range is 1/4" to 3" (inch). (inch). At the same time, two-sided wrenches are produced in lengths from 100 to 450 mm. Each professional wrench manufacturer optimises the shape of the head, the jaws and the handle profile individually to make the wrench easier to use. Wrenches have a chrome-plated and polished, satin chrome-plated or blackened finish to protect them from corrosion.

Types of open-end wrenches

Forked open-end wrenches are available in two basic versions: 1-sided and 2-sided.

Main characteristics of open-end wrenches

The technical parameters that characterise open-end wrenches are: size (jaw width, mm or inches), overall length (mm), working head thickness (mm), working head height and overall weight (g).

Use of open-end wrenches

Open-end wrenches are used in industry (e.g. vehicle and machine assembly plants), industrial services (maintenance departments), construction and crafts, service and mechanical workshops, including car repair shops. They are manufactured by e.g. Bahco, Beta, Facom, Gedore, Hazet, Proxxon, Snap-on, Stanley, Stahlwille etc.