PTFE Teflon® Fasteners PTFE fasteners include Teflon® screws, hex nuts, hex head cap screws, flat washers, etc. It is also used to fabricate custom parts. Is is sold under the brand name Teflon®. However, this material can only be turned, or made into parts on a CNC machine. It can also be compression molded. But it cannot be injection molded. It is not thermoplastic. PTFE fasteners and custom parts are