The invention relates to a multiplicity of processes for producing an encoder (40) for bearing units. A process comprises the following steps: -introducing an insert part into a mould (20), where the insert part is a supportive part (42), a metal foil (44) or a metal-coated foil, -injecting a melt (30) into the mould (20), where the melt (30) consists of a material that comprises nylon-6, nylon-12 or polyphenylene sulphide and at least one magnetic filler, and -pressing the melt (30) where, on cooling of the melt (30) the melt (30) becomes bonded to the insert part to give the encoder (40). Alternatively, a first component (25) is injected into the mould (20), where the first component (25) is an adhesion promoter. Another process for producing an encoder is a fluidized-bed sintering process.