A hydraulic torque wrench system including a low profile power head connectable to a ratchet link is disclosed. The power head includes a housing having opposed side walls with a width therebetween. A first connection unit located on the front wall of the housing includes a front projection having a stem and opposed arms. The stem has opposed side walls that extend from the front wall of the housing to a radiused free end. The opposed arms extend laterally from the opposed side walls. The first connection unit is coupled a connection slot in the ratchet link. A second connection unit located on the bottom wall of the housing includes a bottom projection with a bore. The second connection unit is coupled to a bore in the ratchet link by a pin. The opposed arms span a distance that is less than or equal to the width of the housing.

A hydraulic torque wrench (10), comprising: an input, for pressurised hydraulic fluid; a drive connector (14); a drive connector (13), driven by hydraulic fluid introduced at the input and arranged to drive the drive connector (14) to rotate; a drive member (1) for connecting to an item to be rotated by the hydraulic torque wrench (10), the drive member (1) comprising: a drive member (16), which engages the drive connector (14) so as to be driven by the drive connector (14) and a second part (18) arranged to be coupled to the item to be rotated. In which the drive member (1) comprises a retention mechanism which has two states: a first state, in which it prevents removal of the drive member (1) from the drive connector (14); and, a second, state in which it permits removal of the drive member (1) from the drive connector (14). In which the retention mechanism remains connected to the drive member (1) in the first state and in the second state. In which the retention mechanism comprises at least one retractable pin in the drive member (1), the retractable pin extending from the drive member (1) into the drive connector (14) in the first state and retracting into the drive member (1) in the second state. In which the drive member (16) of the drive member (1) has splines (15), and the drive connector (14) has splines (15) complementary to those of the drive member (16) of the drive member (1). In which each pin protrudes from the splines (15) of the drive member (1). There is no need to remove a separate retention member to change the drive member (16).

A uniquely designed torque wrench having a torque body, the torque body attached to a frictional squeezing clamp, and a lug socket which is rotationally connected to the frictional squeezing clamp. The frictional squeezing clamp entering a contracted stated during extension of a rod of a hydraulic cylinder, and entering an expanded state during the retraction of the rod of a hydraulic cylinder, the lug socket turning the wing nut of a hammer union.

A hydraulic torque wrench and method of operation. The wrench may include a housing supporting a drive element for engaging a fastener; a drive actuator for exerting a torque on the drive element; a sensor configured to sense movement of the housing; and a controller having an electronic processor, the controller being configured to receive a first signal from the sensor, determine, based on the signal, whether the housing is moving, and inhibit operation of the drive actuator in response to the housing of the hydraulic torque wrench moving.