According to at least one aspect, a monolithic sensor mount can include a first cylindrical portion and a second cylindrical portion. The first cylindrical portion can have a first diameter and the second cylindrical portion can have a second diameter larger than the first diameter. The second cylindrical portion defining a recess region to host an ultrasonic transducer. The second cylindrical portion can have an outer surface that defines a male thread to mechanically engage a female thread of a cavity within a fluid flow tube configured to host the sensor mount.

A member (10), for bearing a load, including a load receiving portion (12) at which the load is applicable to the member. A strainable portion (14) is connected to the load receiving portion to be strained by the load. A datum (16a) is defined and an elongate portion (18) defines another datum (18a). The datums are arranged such that relative displacement therebetween indicates an amount by which the strainable portion is strained. The strainable portion defines the datum.

A bolt load measuring arrangement 31 has a bolt 4 with a reference pin 10 extending from the root 12 of a hole 11 in the bolt. Shoulder 23 of a bore 22 defines a strainable portion datum shoulder located within the strainable portion 7 of the bolt 4. Strain datum sleeve 32 can have a strain datum surface 16 at its outer end. The strain datum sleeve 32 has a hole 33 to allow it to pass around the reference pin 10 which extends to the end of the strain datum sleeve. The reference datum 15 is on the outer end of the reference pin 10 and the strain datum 16 is on the outer end of the strain datum sleeve 32. The outer end of the strain datum sleeve includes an alignment protrusion 34 over which the measuring tool 40 engages. Fit between the alignment protrusion and the tool 40 is essential to achieving the alignment accuracy for accurate datum relative position measurements and therefore accurate load measurement. For the alignment of the measuring tool 40 to be sufficiently accurate, the engagement length 37 is at least 0.9 times the engagement width 38, being 0.9 times the width or diameter of the alignment protrusion.

A safety fastener and a safety system are provided. The safety fastener indicates when a fastener is damaged, and the safety system indicates when a safety critical component is damaged. The fastener includes a load bearing body that encloses an inner volume filled with fluid, and a fluid sensor that detects the presence of the fluid within the inner volume. When the fluid sensor detects the fluid, a fluid present state is activated. If the fastener is damaged, fluid may escape from the inner volume, such that the fluid sensor leaves the fluid present state, indicating damage has occurred.

A connection element consists of a longitudinally oriented support structure that is at least partially hollow and a sensor unit that is arranged in the inside of the support structure, is connected to a signal transmission device, and is non-positively connected to the support structure. The required force for the non-positive connection is produced by internal stresses after a plastic deformation of the support structure during a joining process of the support structure and the sensor unit. A method for manufacturing a connection element consisting of a support structure that is at least partially hollow and a sensor unit includes positioning the sensor unit in a region of the support structure and, using radially movable tool segments, exerting a force on the support structure in the radial direction and at the same time reducing the periphery of the support structure in the region in which the sensor unit is positioned.

A monitoring system includes a fastener. A sensor is coupled to the fastener. A circuit board is electrically coupled to the sensor. An antenna electrically coupled to the circuit board.

A power supply and signal transmitting device for a sensing bolt and sensing bolt device is provided. The power supply and signal transmitting device, which is applied to the sensing bolt including a first contact set, includes a cap module and a supply module. The cap module caps one end of the sensing bolt and includes a cap circuit board module. A second contact set of the cap circuit board module contacts the first contact set for electrically connecting the sensing bolt. The supply module is interposed into the cap module for supplying an external power to the sensing bolt or accessing the io data stored in the sensing bolt by electrically connecting a third contact set of the cap circuit board module with a fourth contact set of the supply module. Thereby, the power duration of the sensing bolt may be improved.

Provided is a screw that includes a threaded shank extending along a longitudinal axis; a head configured to be engaged by a tightening tool to tighten the screw; and an extensometer housed in a longitudinal cavity made in the shank, to measure a measurement parameter representing a tightening force of the screw. A coil, a power supply, a microprocessor and a transmitter are located in a housing made in the head. The power supply is connected to the coil to receive electrical energy by electromagnetic induction through a contactless transmission line, and to the microprocessor and extensometer to supply them with electric power. The microprocessor is connected through a conditioning module to the extensometer to receive the measurement parameter and to the transmitter to transmit the measurement parameter externally of the screw through a wireless measurement signal.

An Internet of Thing (IoT) device includes a head portion; an elongated stress sensor coupled to the head portion, the stress sensor coupled to a surface; a processor coupled to the stress sensor; and a wireless transceiver coupled to the processor.

An Internet of Thing (IoT) device includes a head portion; an elongated stress sensor coupled to the head portion, the stress sensor coupled to a surface; a processor coupled to the stress sensor; and a wireless transceiver coupled to the processor.