Constant Torque Position Control Hinge

Constant Torque Position Control Hinges provide constant resistance throughout the entire range of motion, enabling users to easily position doors, display screens and other mounted components and hold them securely at any desired angle.Eliminates the need for secondary supports to hold hinged components in position.
https://www.taisamhardware.com/en-US/p1639-constant-torque-position-control-hinge-hgt-bxx-10xt-series

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