Final answer:
Using a washer with a screw helps distribute the load evenly and prevent damage to the materials being fastened, ensuring a secure connection.
Step-by-step explanation:
The best reason for using a washer with a screw is to distribute the load evenly and prevent damage to the material being fastened. A washer is a thin, flat disc that is placed between the screw head/nut and the material surface.
It helps to spread the load over a larger area, reducing the pressure on the material and preventing it from being crushed or weakened.
For example, when assembling furniture, using a washer with screws can ensure that the pressure is evenly distributed, preventing the wood from splitting or cracking. Similarly, in automotive applications, washers are used to distribute the load evenly and prevent the fasteners from loosening.
By using a washer, the screw can be tightened without causing excessive damage to the material, ensuring a secure and long-lasting connection.