Abstract: An improved locking terminal is provided for a full tilt, double-hung or single-hung window. The conventional full tilt, double-hung or single-hung window comprises a window frame having a pair of vertical jambs, each of which have a jambliner mounted therein. Each of the jambliners are provided with a pair of horizontally spaced and vertically disposed channel members which are open toward the sash sides of the window. A mechanical balance is mounted in each of the four channels and has a locking terminal associated therewith which is adapted to grip the walls of the channel to maintain the locking terminal in place in its respective channel when the sash is tilted inwardly for removal from the window frame. Each locking terminal includes a channel-shaped slide member with a back projecting from a lower end thereof and an arm projecting upwardly from the back, generally parallel to the slide member.