The 031-5653 is a lockwasher accessory designed for BNC 75 ohm PCB bulkhead receptacles. This component is nickel-plated for corrosion resistance and is supplied in packages of 100 units. The lockwasher is used in conjunction with hex nuts (such as part 31-5652) to secure BNC connectors to printed circuit boards, ensuring reliable mechanical and electrical connections. It is particularly useful in high-temperature and mass production assembly environments where rigid connector mounting is required. The lockwasher prevents loosening of fasteners due to vibration and thermal cycling, making it essential for maintaining connection integrity in demanding applications.