The cylindrical measuring pins are made of superior quality high carbon chrome alloy steel, hardened to 58-60 hrc, to provide a high degree of wear resistance.
The inspection mandrels are made of hardened and stabilized steel. For easy usage and accuracy the mandrels are provided with properly ground and lapped centers, recessed at both ends for protection from damage.
The wheel flanges are made of low carbon steel with all contact surfaces machined to a smooth finish. Maximum seating of the flanges on machine spindles is ensured by proper grinding and lapping of the taper bore in the flanges.