Type DC is a sprag-type freewheel cage without inner or outer races. It must be installed in a design that provides races, bearing support for both axial and radial loads, lubrication and sealing. The DC-type version-N accepts all common lubricants used in power transmission equipment.

To ensure correct function, the sprag space tolerance must not be exceeded and both inner and outer races must have a minimum plain width “e” without any recess. Alternatively, the races can be manufactured in case-hardened steel shafts or housings to specification. The surface hardness of the finished part should be HRC 60–62 to a minimum depth of 0.6 mm, with core hardness HRC 35–45 and surface roughness not exceeding 22 CLA. Maximum taper between races should be 0.007 mm for a 25 mm width.

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