The cones are conical nuts that screw onto the axle.
Cup and cone ball bearings.
The surfaces are cut typically by grinding.
The combination of cup cone and balls forms the bearing.
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If the cones are screwed on too far they exert pressure on the bearing balls.
Cup cone bearing.
There is a bearing on each side of the hub.
The cups are built into the shell of the hub.
Round ball bearings roll on the curved surface of the cup and cone.
Bearing surfaces are made from hardened steel.
Angular contact bearings also allow easier maintenance adjustability and serviceability.
Angular contact bearings of the cup cone type offer greater strength than sealed cartridge industrial bearings due their ability to displace lateral and vertical loads more effectively for super smooth rotation and longer durability.
Even the highest quality bearing surfaces will have slight grinding marks.
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