This 4-pin small-format interchangeable core (SFIC) represents the original standard developed by BEST, forming the foundation for one of the most enduring mechanical keying systems in the industry. Designed for fast rekeying with a control key – without removing lock hardware – the 4-pin configuration offered simplicity, security, and flexibility for facilities. As access control needs grew more complex, BEST later introduced 7-pin versions to expand keying capacity and enhance security. Still, the 4-pin core remains a legacy of early innovation and a hallmark of BEST’s impact on the modern lock industry that continues today with dormakaba Group.
