Abstract: A reaction arm mounting assembly comprises a first part and a second part, the first part being configured for attachment to a power tool and the second part is mounted on the first part. The mounting of the second part on the first part: permits sliding motion between the first and second part along an axis common to the first and second parts in a first sliding region and prevents rotation between the first and second member in the first sliding region; and permits rotation between the first and second members in a second sliding region.

Abstract: A fastener holding spanner comprises a spanner head defining an aperture capable of engaging during use with a correspondingly-sized nut or bolt head of a fastener, with a clearance there-between, and at least one arm extending from the spanner head. During use of the spanner one of the at least one arms is capable of engaging with an abutment surface adjacent to a nut or bolt head of a fastener engaged by the spanner head upon rotation of the nut or bolt head under applied torque. The aperture comprises a plurality of internal faces, at least two of which are engaging faces. The engaging faces are substantially flat and are arranged to engage with flat faces of a nut or bolt head engaged by the spanner during use. At least one of the internal faces of the aperture is non-engaging with the nut or bolt head during use, the at least one non-engaging face located in between the at least two engaging faces.

Abstract: A torque wrench assembly comprises a torque wrench and a reaction arm and locking means for locking together the torque wrench and the reaction arm. The locking means comprises a connection member located on the torque wrench; an opening on the reaction arm for receipt of the connection member of the torque wrench; a locking member slidably mounted in a channel on the reaction arm, the locking member including an aperture sized to allow the connection member to pass therethrough; and biasing means arranged to bias the locking member into a position wherein the aperture is partially aligned with the opening. The connection member has an insertion end for insertion into the opening of the reaction arm, and immediately adjacent the insertion end is a recess. The recess is shaped to receive a part of the locking member.

Abstract: A fastener holding spanner comprises a spanner head defining an aperture capable of engaging during use with a correspondingly-sized nut or bolt head of a fastener, with a clearance there-between, and at least one arm extending from the spanner head. During use of the spanner one of the at least one arms is capable of engaging with an abutment surface adjacent to a nut or bolt head of a fastener engaged by the spanner head upon rotation of the nut or bolt head under applied torque. The aperture comprises a plurality of internal faces, at least two of which are engaging faces. The engaging faces are substantially flat and are arranged to engage with flat faces of a nut or bolt head engaged by the spanner during use. At least one of the internal faces of the aperture is non-engaging with the nut or bolt head during use, the at least one non-engaging face located in between the at least two engaging faces.

Abstract: A reaction arm mounting assembly comprises a first part and a second part, the first part being configured for attachment to a power tool and the second part is mounted on the first part. The mounting of the second part on the first part: permits sliding motion between the first and second part along an axis common to the first and second parts in a first sliding region and prevents rotation between the first and second member in the first sliding region; and permits rotation between the first and second members in a second sliding region.

Abstract: A torque wrench assembly comprises a torque wrench and a reaction arm and locking means for locking together the torque wrench and the reaction arm. The locking means comprises a connection member located on the torque wrench; an opening on the reaction arm for receipt of the connection member of the torque wrench; a locking member slidably mounted in a channel on the reaction arm, the locking member including an aperture sized to allow the connection member to pass therethrough; and biasing means arranged to bias the locking member into a position wherein the aperture is partially aligned with the opening. The connection member has an insertion end for insertion into the opening of the reaction arm, and immediately adjacent the insertion end is a recess. The recess is shaped to receive a part of the locking member.