Fork terminals help prevent frayed wires and offer a high level of protection. Often times in an electrical environment, vibration is a factor. Standard lock terminals will disconnect should the holding screw loosen. Two innovations have solved this problem while maintaining the ease of use typical of fork terminals.
How have they solved the problem? Locking forks have a projection inside the forks, causing the terminals to snap onto the screw. Flanged forks have the ends of the forks turned up. Both of these designs will keep the terminal fastened even if the holding screw loosens. Make sure to use the correct tool in order to guarantee the correct pressure and proper crimp.