Fontana Fasteners R.d. S.r.l.

Paolo Redaelli

Sergio Cattaneo

Sven Fischer

Giuseppe Fontana

Zoran Bjelobradic

Simone Aiassa

Frank Kirchherr

Flora Barlassina

Alberto Fontana

A fastener and a system, apparatus, and method for monitoring a fastener are described. The fastener includes a head portion, a shank portion, a transponder, and a compression spring, wherein the head portion includes a mounting portion, and wherein the transponder is disposed in the mounting portion of the head portion. The transponder is arranged to monitor the shank portion, and includes an ultrasonic sensor and a signal processing circuit. The ultrasonic sensor is affixed to a transducer hosting surface, and is urged against the transducer hosting surface by placement of the printed circuit board in the head portion with the compression spring intervening therebetween. The ultrasonic sensor communicates with the signal processing circuit via the compression spring. The signal processing circuit captures a signal from the ultrasonic sensor and transforms the signal into a parameter corresponding to a tensile force being exerted by the fastener.

Method, apparatus, and system for a fastener having a wireless monitoring system

Screw elements are provided which include a shank having a thread and a head connected to the shank, the head having a tool engagement portion which comprises six corner domes arranged evenly distributed in the peripheral direction of the head and comprising respective flanks, by which the head can be brought into positive cooperation with a hexagon socket of a tool for tightening of the screw element, wherein respective recesses are arranged peripherally between the corner domes, and wherein the flanks of the corner domes are respectively provided at least partially with a radius.

Screw elements having a tool engagement portion

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Veduggio Con Colzano (MB), Italy

Paolo Redaelli