Associated Spring SPEC A member of the international Barnes Group, Associated Spring is a major force in its own right with worldwide sales of standard and special springs. In the UK, Associated Spring SPEC Limited is backed by the resources of the parent company, enabling it to offer British development and production engineers an extensive range of precision springs and components from stock. The company also works closely with design engineers on major experimental and prototype projects that frequently translate into the high-volume production of special springs and accessories.