Torkmärken

Torkmärken, also known as torque marks or witness marks, are visual indicators on a fastener, such as a bolt or nut, that are used to confirm proper tightening. These marks are typically made by drawing a line across the fastener and the surface it is securing with a specialized marker or paint. Once the fastener is tightened to the specified torque, the line will remain unbroken. If the fastener loosens, the line will break, immediately signaling that the torque has been compromised.

The primary purpose of torkmärken is to provide a simple, visual confirmation of fastener security, especially in critical applications where over-tightening or under-tightening can lead to failure. They are commonly used in industries such as automotive, aerospace, and manufacturing, where safety and reliability are paramount. The application of torkmärken is a quick and cost-effective method for quality control and preventative maintenance. They allow for rapid inspection of multiple fasteners in a system, making it easier to identify any potential issues.

The effectiveness of torkmärken relies on consistent application and proper marking material. The marks should be clearly visible and durable enough to withstand the operating environment of the assembly. While torkmärken do not measure the actual torque applied, they serve as a reliable indicator of whether the fastener has been tightened to the correct level and if it has subsequently moved. This visual cue is an important tool for ensuring the integrity and safety of mechanical assemblies.