Abstract: A fluid-tight fitting includes at least one strain gauge or includes at least one passage, said passage extending radially through a nut and communicating with an interior chamber defined by a first conduit, a second conduit, and the nut, or includes a visual indicator associated with at least one of a nut or a first conduit of the fitting.

Abstract: An instrumented, load-sensing washer that can be used on a bolted joint to facilitate determining an axial clamping load of the bolted joint. The washer includes an annular washer body having first and second oppositely disposed axial ends and an outer circumferential sidewall. At least one strain gauge is provided on the circumferential sidewall and is configured to sense a deformation of the washer body do to clamping forces of the bolted joint. The washer further includes a communication assembly operatively coupled with the at least one strain gauge. The communication assembly may include an integrated circuit adapted to receive electrical signals from the at least one strain gauge related to the axial load borne by the washer.

Abstract: A fluid-tight fitting includes at least one strain gauge or includes at least one passage, said passage extending radially through a nut and communicating with an interior chamber defined by a first conduit, a second conduit, and the nut, or includes a visual indicator associated with at least one of a nut or a first conduit of the fitting.