Most impact wrenches require air pressure of 90 PSI to operate effectively and typically work best within the 80 to 100 PSI range. However, it's important to note that more powerful impact wrenches may require higher air pressure, up to 135 PSI. Regarding cubic feet per minute (CFM), the general recommendation is to have an air compressor with a capacity 1.5 times higher than the minimum requirement of the impact wrench. For example, an average half-inch impact wrench typically requires an air compressor of 10 to 110 CFM.

These are general guidelines, so it's always advisable to check the specific requirements of your impact wrench and refer to the manufacturer's recommendations. Factors such as the frequency and intensity of use can also influence the size of the air compressor needed.

The required torque will depend on the specific application and the level of fastening power required. For general DIY work or light automotive applications, impact wrenches with lower torque ratings, typically around 100 to 300 foot-pounds, should suffice. However, impact wrenches with higher torque capabilities are necessary for heavier-duty tasks, such as heavy machinery repairs or commercial construction projects. In these cases, you might require impact wrenches with torque ratings ranging from 500 foot-pounds to over 1,000 foot-pounds, depending on the specific demands of the job. For accurate guidance specific to your needs, consult the manufacturer's recommendations and consider the nature of your projects. Reach out to your local United Rentals branch to seek expert advice when necessary.