Harken's 152mm (6 in.) Narrow Halyard and Steering Sheave is made of 6061-T6 aluminum to handle high-load masthead and steering applications requiring line or wire. The sheave improves sail handling, speeds up sail changes, and allows the use of smaller, lighter halyard winches. Used in steering systems, it returns infeel in and insensitivity in to helms with wheels. The sheave combines sideload-carrying balls with PTFE composite bushing for radial loads.
It is designed for 1/2 in. (12mm) line or 3/8 in. (10mm) wire and has a maximum working load of 16,000 pounds (7,258km).