Chain wheels with segments type SUR, KS or KSE are designed for low and medium loads. Hubs are
manufactured from carbon steel and segments are cast from hard wearing chilled iron. The small openings in
the hub limits their use as return wheels in elevator boots as material might build up within the wheel
groove. Higher loads can be achieved with HEKO chain wheels type RUA and RUU and better self-cleaning with wheels type RUU. Cast wheel rims are brittle and also
susceptible to fractures caused by heavy knocks. Hubs are also available in grey cast iron (but without cut-out). Cast
wheels are inexpensive and cost effective for less arduous applications. These chain wheels can be used with vertically and horizontally mounted shackles and other types of
bucket attachments depending on the type of segment.

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