What type of marking pencils should be used when marking hole locations on the assembly?

Using non-graphite marking pencils for marking hole locations on assembly is essential because graphite can create weaknesses in the material due to its lubricating properties. In aerospace applications, precision and the integrity of the materials are paramount. When graphite is marked on metal or composite surfaces, it can interfere with adhesion when later applying coatings or undergoing further assembly processes.

Non-graphite marking tools, such as those made with colored wax or other materials, provide good visibility for locating holes without compromising the material's properties. These pencils ensure that markings can be easily seen while preventing contamination or weakening of the surfaces involved in the assembly process. They are designed specifically for use on the materials typically found in aerospace manufacturing, ensuring both clarity and compatibility with the subsequent stages of production.