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NACHI 5207A-2NS bearing competitive price in Japan

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Double-row Angular Contact Ball Bearings - merko as

5207A. 5207AZ. 5307. 5208. 5208Z. 5208A. 5208AZ. 5308. 5209. 5209Z. 5209A. 5209AZ. 5309. 5210. 5210Z. 5210A. 5210AZ. 5310. Bearing No. 5200ZZ. Dimensions of snap ring groove and snap ring (mm). D2. (max) f. (max) a. (max) b. (min). Open type. Bearing No. Shield type. Seal type. With snap ring groove.

More double row angular contact bearings.. zero/negative clearance

So evidently, the "preload by fit" worked sufficiently well to allow the double row to be used as a lathe spindle bearing with no further preload used. A tapered roller could be installed in-place of the 5207. A way to retain the outer race and adding preload to the back end would need to be figured out.

Double row angular contact ball bearings -

Less axial space. Can be used for applications where two single row angular contact ball bearings arranged back-to-back take up too much axial space. Accommodates radial as well as axial loads in either direction; Accommodates tilting moments; Stiff bearing arrangement