The heavy-duty HEX-FLX coupling from Hayes provides operation below critical speeds with high tensional stiffness and minimizes spline fretting. Features include improved shaft clamping, ease of installation, an operating temperature range of -40 to +300°F (-40 to +149°C), a compact size, and a robust service life. The design is available for applications up to 600 hp (450 kW) in various lengths. The coupling handles high shock loads and offers a two-piece blind mounting and bore and keyed or splined hub; sintered hubs can be modified as needed. Suitable applications include off-highway construction equipment such as arial lifts, bucket loaders, skid steer loaders, excavators, sweepers, and wheeled loaders.