5507-2021 (BCR) Burton Compatible 55 series BULKHEAD PIN INSERT 20 shell 21 pin The Burton 5500 series connector is a high-quality, rugged and reliable connector system designed for use in harsh environments. This connector series is commonly used in military, aerospace and industrial applications where reliable electrical connections are vital. The Burton 5500 series connector features a bayonet style locking mechanism that ensures secure and reliable mating. The connector has a 360-degree EMI/RFI shielding design that provides effective protection against electromagnetic interference. The connector is available in multiple shell sizes and configurations, including plug, receptacle, and jam nut receptacle.