A special form of the ceramic cylinder roll is the ceramic needle or round shaft. These break-resistant but brittle ceramic materials can be used for long and thin designs - but only for limited loads. The diameter/length ratio of 1.5 to 2.0 should be used for high loads. The use of ceramic needles in needle roller bearings ensures a high-precision component. However, load peaks and stresses should definitely be avoided. If necessary, consider shorter needles or rolls in two, three or more rows. Round, square and rectangular ceramic shafts are used in linear technology applications at high temperatures or in clean room environments and we have experience of them all. Please always provide a sketch and full description for us to supply you with detailed quote. We’ll be delighted to help you.