SAE wrench size are based off an imperial system of measurement and use fractional inches to describes their size. Many tools use SAE wrench sizes to match the bolts, nuts, and fittings with hexagonal heads. Using the wrong size of wrench will cause the tool to slip from the bolt.
This will round the edges of the bolt and make it very difficultly to remove the bolt. In some instances, a extractor tool will have to be used to remove the bolt. It is important to ensure the SAE wrench size match the bolt size.
SAE Wrench Sizes and How to Use Them
SAE wrench sizes comes in various sizes that range from small fractions of an inch to large fractions of an inch. SAE wrench sizes can be used for a variety of applications. For example, a 1/4″ SAE wrench is a smaller tool that will fit tiny screw.
On the other hand, a 1-1/8″ SAE wrench is a large tool that will fit into large axle nut. The size of the bolt will determine the size of the wrench. For example, a 3/8″ bolt will require a 9/16″ wrench to fit into the corners of the bolt.
Using a wrench that is too small will strip the bolt. There is instances when metric sizes and SAE sizes will be used. However, the sizes are not the same.
For instance, a 1/2″ SAE wrench is similar than a 13 mm wrench, but they are not the same size. Using a metric wrench on an SAE bolt will cause the wrench to slip and damage the bolt. It is important to know the decimal equivalents of the wrench sizes to identify the correct tool.
There are various type of wrenches. Each wrench is used for specific tasks. For example, combination wrenches have a box end and an open end, meaning they will serve two different tasks.
Ratcheting wrenches allow a worker to turn a bolt without lifting the wrench from the bolt. Flare nut wrenches is used specifically for brake lines. Stubby wrenches have shorter handle and are used in tight space.
Lastly, crowfoot wrenches have offset handles to allow workers to reach bolts that are in blind spots from the workers perspective. Each trade has specific wrench sizes for specific tasks. Automotive mechanics use SAE wrench sizes between 1/2″ and 3/4″ for engine bolt.
HVAC workers use flare wrenches for refrigerant line on HVAC units. Farm equipment requires very large SAE wrench sizes, like 1-1/4″ wrenches for PTO shafts. Plumbing applications will use 1/2″ or 5/8″ wrench size for compression nuts.
By following the specification for each task, workers will reduce the number of errors that occur in the workplace. There are specific procedure to follow when using SAE wrench sizes. Mechanics should always use the box end of the wrench to set the bolt to the proper torque.
Once the bolt begins to turn, the worker should use the open end of the wrench. Workers should always pull the wrench toward their body when tightening bolts. This will reduce the chance of injury to the worker should the tool slip from the bolt.
Additionally, it is important to wipe the wrench to remove any oil or grit that could cause the wrench to slip on the bolt. It is also recommended that stuck bolt be soaked in a penetrating fluid for at least fifteen minutes before the use of the wrench. Finally, cheater pipes should never be used on wrench handle as they will snap the wrench tool.
