Disc Springs

Disc springs, in excess of 6mm thickness, have larger diametral clearances. In order to minimise the possibility of bearing point misalignment when disc springs are stacked in series i.e. "back-to-back", flats are machined on the upper inside and lower outside diameter edges. The introduction of this bearing flat can also move the position of the points of contact, as a result reducing the effective radial width of the disc spring and increasing its stiffness. In order to guarantee that disc springs with bearing flats have similar characteristics to the same size disc springs without flats, the nominal thickness is reduced.