CSK phillips head machine screws are made with stainless steel. Csk screws are similar to bolts as they have a head and a shank. It can be used for the assembly of machine and electrical components. The usage of these screws is also subject to the drilling of a pilot hole. They are also able to be used with a nut and come with a range of thread patterns. With the appropriate usage, they can bring a flat finish to the surface of operation.
Flat countersunk head has a flat top surface and a conical bearing surface with a head angle of approximately 82 deg for one style and approximately 100 deg for another style.
For short lengths of 82 deg of head angle, machine screws have heads undercut to 70 % of normal side height to have greater length of thread on the screws.
