Figure 2

Measurement of the size of the screw samples: (a) scanning of the screws with a 3D optical scanning system, (b) use of a 3D microscope to photograph the screws with holding device and measure their size, (c) image of an OEM screw obtained with the 3D microscope under a magnification of 50 ×, and (d) image of an aftermarket screw obtained with the 3D microscope under a magnification of 50 ×.