Description
A standard screw that has a diameter of 4-40 UNC approx: 2.84mm. It is therefore an American coarse threaded screw that has an outer diameter of 2.84mm, which is then called 4-40. It has 40 threads in one inch = 25.4mm, if you are unsure, you can count the number of threads the screw has in 25.4mm. You measure the length under the skull and it is stated in millimeters. We have a lot of different makes in stock. It differs in color and surface treatment as well as how long the part of the screw is threaded. It is a normal standard model of all screws we stock. We deliver what we have in stock at the moment.