Available. The Heidenhain ERA_4200C_20000_R20_A3908_00_01 is a high-precision scale drum designed for incremental modular angle encoders. It features a line count of 20,000, a grating period of 20.000 µm, and a graduation accuracy of ±3.0 arc seconds. The drum's geometry includes an outer diameter of 127.64 mm, an inner diameter of 80 mm, a hole circle diameter of 95 mm, and six holes with a diameter of 5.5 mm, all equipped with a centering collar. Coded reference marks are provided, with a nominal increment of 2,000 grating periods. The mechanical permissible speed without mechanical fault exclusion is 12,250 min⁻¹, and with mechanical fault exclusion, it is 6,250 min⁻¹. This scale drum is ideal for applications requiring high-resolution angle measurement and precise rotational positioning.