Open end wrenches

Open end spanners are used for demounting hex-head fasteners. They have open U-shaped opening and grip the components from 2 or 3 sides. It allows to work even if access to fastener is complicated. The products are generally made of tool steel, have a simple construction and cost inexpensively.

Types

Devices differ from one another by:

• Size of the opening. This index can be 4, 20, 36, 55 mm, etc.
• Apart from simple single-sided tools, there are combined ones in manufacturers’ catalogues. They can have 2 open end elements of different sizes or a ring element on one side.
• Angle of working part location. The head of standard tools is located at 15° angle to handle longitudinal axis. There are also tools with this index of 70°. Moreover, bent spanners for working with hard-to-reach parts are sold.

Tips on open end spanners use

1. You should take into account diameter of the part. Particularly, too large tool can damage it.
2. You should not use the accessory if it is deformed or has shears. Both gripping parts should be parallel to each other.
3. You should not make much efforts when working. Otherwise fastening edges can be torn off and the tool itself broken down.
4. If the threaded connection is heavily corroded, it is not recommended to use the open end spanner. Demounting of this element is easier to perform with the help of ring type tool.

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