Disc spring (Belleville washer), DIN 2093 Series B, 20 × 7 × 0.8 mm, 50CrV4 spring steel. Standard-height disc spring for medium-load applications. Load ~230 N at flat compression. Stacked in series (softer, longer stroke) or parallel (stiffer, higher load) to achieve desired characteristic. Applications: bolt-preload spring under stud, clamp-force maintenance in vibration, quick-release pin retention. See our DIN 2093 disc spring catalogue guide for the complete Series A/B/C dimensional and load reference.