HOG 163 is an incremental encoder designed with hollow shafts ø20 to ø75 mm and a resolution of 250...5000 steps/turn. it's an upgraded version from HOG 16 which has a hollow shaft ø20 to ø38 mm …

Hengstler Incremental Encoders HSD25 | Descriptions The optical HSD25 hollow shaft rotary encoder with up to 19.05 mm shaft diameter will work reliably within a temperature range from -40°C to +100°C.…