Abstract: Washer, including: a carrier element; a counter element; and a sensory layer system arranged between the carrier element and the counter element and configured to output a sensor signal on the basis of a force prevailing between the carrier element and the counter element along a screw axis and/or a prevailing pressure force or vibration; wherein the carrier element and the counter element are arranged along a screw axis and wherein the carrier element includes a geometry that is engageable with a geometry of the counter element so as to limit or prevent a rotation between the carrier element and the counter element.

Abstract: A connection device, in particular a screw connection device, including: an energy supply device; a communication device, and a sensor system, wherein the energy supply device is configured to supply the sensor system and/or the communication device with energy, wherein the communication device is configured to transfer a sensor value with the aid of the sensor system to the outside.