SPIROL® Series 550 Cosmetic Coiled Pins were designed specifically to be used as hinge pins in cosmetic cases. Considering the configuration of the pin and the fact that it is a functional spring, care must be taken when measuring the pins so as not to skew the measurement results. This White Paper will walk you through how to measure the key characteristics of a Series 550 Cosmetic Coiled Pin as well as recommend the proper measurement equipment.