Ruian Dingfeng Standard Parts Factory is a small and medium-sized enterprise specializing in the R&D, production and sales of standard parts, fasteners and stamping parts. Its leading products include retaining rings for holes and shafts, circlips, internal and external tooth washers, internal and external serrated washers, grounding washers (gripping washers), single-sided tooth washers (French washer NFE25-511), double-sided tooth lock washers (JB4340-2006), anti-slip washers, saddle washers, wave washers, disc washers, locking nuts, as well as German standard and various non-standard series stamping parts.