I.16.3. Surface of aluminum cone rings

Surface of aluminum cone rings: the conical area is always smooth and non-serrated. The back side now has either 18 milled grooves for gear housings with milled grooves (all standard-versions), or has a knurled / serrated surface for knurled / serrated gear housings (most reha-versions).

Photo above: aluminum cone ring with milled grooves on the back side for housing with milled grooves

Photo below: aluminum cone ring with smooth surface for knurled housing

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