This unit guides and tensions roller chain drives, combining a sprocket wheel with an integrated bearing arrangement on a single mounting stud. The bore diameter is 16.2 mm, outside diameter 40.0 mm, and net mass 0.43 kg. The sprocket body is made from steel or sintered iron, giving a compact, self-contained roller that runs on the chain without a separate housing or shaft support. The integrated bearing design allows the sprocket to rotate freely under chain load while keeping radial dimensions low, making it suitable for tensioning or guiding positions where a fixed stud mount is available. Its closed construction protects the internal bearing from external contamination during operation, and the fixed bore diameter simplifies mounting directly onto a stud without additional adapter parts.