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Shouldered With Plain, Delrin, Or Oilite Bearings Shouldered part provides its own spanner. |
Straight Axle For Flange Ball Bearings No spanner necessary. Zerk through hub or axle. |
Shouldered For Butt Ball Bearings Has self-contained spanner. Grease through axle only. |
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Shouldered With Roller Bearings Spanner is virtually always used. Zerk through axle. |
Straight Axle With Roller Bearings Spanner used. Zerk through hub or axle. |
Straight Axle With Timken Bearings Bearing rides directly on axle. Zerk through hub only. |