Please measure everything yourself. The diameter of the washer, specified in the standards, requests for the purchase of fasteners, corresponds to the outer diameter of the bolt, screw, and stud. The actual diameter of the inner hole of the hardware, depending on the accuracy class and size, is 0.1mm - 4.0mm larger. You can find more detailed information on how to make measurements correctly on the network and depending on the tools you need to take measurements. You can also go to
scrooz.com.au and pick up what you need there.