|
The main function of a wrench is to hold and turn various threaded parts of fasteners (i.e. nuts, bolts, caps, screws and plugs). If you apply too much torque you will strip the threads of the material, therefore quality wrenches are designed with perfect balance for leverage and intended load in safe balance. |
|
Open-end wrenches are closed on two sides of the head with another side open in order for the wrench to be placed around a nut that may not be accessible to a closed or box wrench. Open-end wrenches have different size openings to fit the nut exactly to prevent marring the nut edges. |
 |
|
|
Box-end wrenches have completely closed heads that fit around the entire nut. Some are slightly offset to provide room for the users fingers and extra room over obstructions. |
 |
|
|
Combination wrenches have a box and an open-end on opposite sides of the same wrench. Both ends are usually the same size for convenience while working. This is the most popular style of all fixed-end wrenches and is frequently used for working on machines. |
 |
|
|
Adjustable wrenches come in two different styles: locking and non-locking. The non-locking style has an adjustable end opening with little provisions made for slippage. The locking style also has an adjustable head, but uses a locking mechanism to secure jaws in the desired position to insure that it will not slip. |
 |