Abstract: A corrosion-resistant screw-securing disc has an annular, stainless steel disc body for arrangement between a screw head and a flat support, with a disc upper side and a disc underside. The surfaces of the disc upper side and of the disc underside of the disc body are compacted by a stamping process, wherein the disc body has a material thickness of at least 1.5 mm and has a convex shape.

Abstract: For achieving improved securing effect in use with oil or wax coated contact surfaces, a self-locking resilient or non-resilient element, such as a spring-ring or a washer, has wall-like protrusions extending on each major surface from the inner to the outer boundary, and recesses lying therebetween, the protrusions each having a plateau-like upper surface which, viewed in cross-section along the peripheral direction of the element, is curved concavely in order to form edges lying in the region of the plateau boundaries, the edges being formed as scraping edges. The wall-like protrusions extend radially in a zig-zag manner from the inner boundary to the outer boundary of each major surface, and each of the recesses lying between the protrusions forms a zig-zag-shaped continuous channel, open in the region of the inner and outer boundaries in order to achieve a drainage effect.