roller bearing
noun
1A bearing similar to a ball bearing but using small cylindrical rollers instead of balls.With a roller bearing instead of having a contact point that is only a spot, you have an entire strip running along the width of the bearing....
- Many bearings look very similar, whether they are ball bearings, roller bearings or other bearings.
- The roller bearing is there to prevent the round from shifting forward in the magazine.
1.1A roller used in a roller bearing.
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