A ratchet wrench devised for torquing axially placed hexagonal nut fasteners on hydraulic or similar lines. The wrench is formed of two main components: The first component consists mainly of a straight elongated handle with a semi-circular collar head attached thereto opening to one side. The collar houses three identical metal inserts which when assembled therein form half a peripherally ratcheting wheel with half an axial inner hexagonally shaped socket of predetermined dimensions. The second main component comprises a second mirror-image semi-circular collar housing identical metal inserts, with a tangentially protruding pin member which slides into a slot disposed in the first component. The two components assembled together form a ratcheting wrench with a wheel having an axial hexagonal slot which circumscribes the fastener to be torqued. A spring-biased pawl disposed in the main component engages the ratchet wheel. Spring-biased latches and other mechanisms disposed within the wrench head provide smooth and fast engagement and disengagement of the two head components.