Description
The nut has a permanently mounted tang lock washer that fits on a screw with a diameter of 8-32 UNC approx: 4.17mm.
The nut therefore fits an American coarse threaded screw that has an outer diameter of 4.17mm, which is then called 8-32 It has 32 threads in one inch = 25.4mm, if you are unsure, you can count the number of threads the screw has in 25.4mm .