Abstract: A hydraulic tensioning apparatus for tensioning a threaded member (2) having a thread, comprising: a hydraulic tensioner (1), having a body (4) and a pressure space (13) for hydraulic fluid and having a thread engaging member (7) arranged to engage the thread of the threaded member (2) and to be urged away from the body (4) on introduction of hydraulic fluid into the pressure space (13) so as to tension the threaded member (2); a displacement sensor (11, 12) arranged to measure a linear displacement of the thread engaging member (7) relative to the base (4) and to provide an output indicative of the linear displacement; a rotation sensor (65, 66) arranged to determine a rotation of a nut (3) rotating on the threaded member (2) and arranged to produce output indicative of a rotation angle of the nut (3); and a control unit (80) arranged to take as inputs the outputs of the displacement sensor (11, 12) and the rotation sensor (65, 66), and to determine from the output of the displacement sensor (11, 12) a requi

Abstract: A socket assembly for turning a fastener with a wrench has ball mechanisms that normally engage with sides of the fastener and that can be deactivated out of engagement with the fastener by turning a collar of the socket assembly. The socket includes a socket body having a fastener receiving opening sized and shaped to engage the fastener so as to drive the fastener rotationally. At least one ball opening is provided in the fastener receiving opening adjacent the fastener when the fastener is received in the opening. A ball is provided capable of partially protruding from the ball opening with the socket in an engaged state. A ball taper insert cams against the ball to push the ball into the ball opening. A spring biases the ball taper insert so as to urge the ball into the ball opening to engage the fastener.

Abstract: A socket assembly for turning a fastener with a wrench has ball mechanisms that normally engage with sides of the fastener and that can be deactivated out of engagement with the fastener by turning a collar of the socket assembly. The socket includes a socket body having a fastener receiving opening sized and shaped to engage the fastener so as to drive the fastener rotationally. At least one ball opening is provided in the fastener receiving opening adjacent the fastener when the fastener is received in the opening. A ball is provided capable of partially protruding from the ball opening with the socket in an engaged state. A ball taper insert cams against the ball to push the ball into the ball opening. A spring biases the ball taper insert so as to urge the ball into the ball opening to engage the fastener.