We are proud to be an American manufacturer! All of our products are tooled and manufactured at our facility in Baltimore, MD. SP Series belleville washers are: - used whenever there is a need to overcome the effects of thermal expansion and contraction and are normally manufactured from high carbon or alloy steel material - designed to maintain preload for Grade 5 / 8 and Class 8.8 /10.9 bolts About Belleville Disc Springs: Belleville washers/ disc springs are discs with a slight cone shape that deforms to a shorter height when subjected to a load along their axis of symmetry. This elastic deformation characterizes the spring action.
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