A metric wrench size chart is an reference chart that illustrates which metric wrench size will fit the bolt based off the distance between the flats of that bolt. The metric wrench size chart is useful to a person because it helps a person to choosing the apropriate tool for a particular bolt. If a person select the wrong size of wrench to fit a bolt, the wrench will slip on the bolt, which will round the edges of the bolt head.
In some instances, if a bolt head is rounded in this way, the bolt becomes difficult to remove. In extreme cases, the bolt may need to be drill out in order to remove the bolt head from the object to which the bolt was attached. Metric wrench sizes is made in whole milimeters, and the size of the wrench for a bolt is based upon the distance between the parallel flats of the bolt head.
Metric Wrench Sizes and How to Use Them
While bolts may have an M-specification that describes the diameter of the threads of the bolt, that M-specification is not the same than the size of the metric wrench. The size of the wrench for a bolt head is based upon the width of the bolt head, and there are specific DIN and ISO measurement standards for those size. A 10mm wrench made in Germany will have the same specifications as a 10mm wrench made in Japan.
Using the correct size wrench ensures that the bolts are tightened or loosen in the specified angles and ensures that the process does not damage the metal of the bolt. Small metric wrenches are typically used for small tasks, as small metric wrench size are used in precision work. Examples of such precision tasks include fixing bicycles and assembling electronic device.
A 10mm wrench is a very common size among metric wrenches. Tasks that require a 10mm wrench include furniture assembly and engine bracket. Because a 10mm wrench is a universal size, it is recommended that a person include a 10mm wrench in any set of metric wrenches.
Metric wrench sizes that are larger than 10mm are often used for automotive tasks. Such tasks may include installing or tighten wheel lugs or suspension components on a vehicle. In these situations a box-end wrench may be required for the task.
In other cases an open-end wrench may be needed. There are several types of wrenches that may be used for different task. Combination wrenches are very common, as they have both open and box-end wrench feature.
A ratcheting wrench allow a person to turn a bolt without removing the wrench from the bolt. Ratcheting wrenches are helpful for tasks to be performed in confined space. Flare-nut wrenches have specially sized jaws for removing or tightening bolts that have soft fittings, such as brake lines.
Using a flare-nut wrench will not round the edges of the fitting. Using the correct type of wrench for any task is important. SAE wrenches are also encounter when using tools.
SAE wrench sizes are made in imperial measurements. Although the SAE and metric wrench sizes may appear to be the same size, they are not the same size. For tasks that require metric wrench size, using an SAE wrench may lead to the wrench slipping on the bolt.
While some people may use SAE wrench sizes to approximate metric measurements, exact metric wrench sizes are preferable because they will distribute the force that is applied to the bolt even across the bolt head. Many quality metric wrenches are made from chrome-vanadium steel. Chrome-vanadium steel is used for wrench sizes because that type of metal can handle flexing without snapping.
High-quality wrenches will have DIN specifications stamp into the wrench. These specifications indicate the quality of the tool. When using a wrench it is important to always fully seat the wrench against the bolt head.
If the wrench is not fully seated against the bolt head the force will be transmitted to the edges of the bolt head, which can lead to the rounding of those edge. Finally, it is important to always clean and oil metric wrenches after their use to prevent rusting of the wrench. Metric wrenches should also be stored in an organized manner to ensure that the jaw of the wrenches are not damaged.
