FCA-6, also known as Fix & Fasten, is a metric fastener system developed by a number of leading manufacturers. This system uses metric and imperial screw threads, together with knurled fixing devices and various other components, to enable fast and safe fixing, assembly and maintenance of components in engineering projects. The system is designed to increase efficiency and reduce the time and cost involved in mechanical assembly and maintenance operations. In addition, the FCA-6 system has been developed to provide an alternative to the imperial screw thread and other traditional fastener systems. This system is used in an ever-increasing number of industries, including automotive, aerospace and general engineering.