Crescent Locks

A crescent lock (commonly known in the local market as a "Moon Lock" or "Chanda Lock") is a semi-circular hook-style locking mechanism designed specifically for sliding aluminum and U-PVC windows. Named after its crescent-moon-shaped rotating latch, it is one of the most widely used, reliable, and cost-effective locking solutions for sliding window systems. The lock consists of two main components: the lock body, which is installed on the inner sliding sash and contains a lever-operated rotating hook, and the keeper or striker plate, which is fixed on the opposite sliding panel. When the window is closed and the handle is turned, the curved hook rotates and securely grips the keeper, pulling both sliding sashes tightly together for a firm lock. Crescent locks improve window performance by compressing internal wool pile and rubber gaskets, helping reduce dust entry, air leakage, and water penetration during harsh weather conditions. Their simple surface-mounted design offers excellent durability, easy operation, and minimal maintenance compared to complex internal locking systems. Available in various finishes and designs, crescent locks are commonly used in residential, commercial, and office buildings for sliding aluminum and U-PVC windows where reliable security and smooth