NTN – Bearing Units – Catalog A 21000 I

The bearing units catalog A‑21000‑I covers cast and pressed housings with factory‑assembled inserts for rapid installation. It compares locking methods—set‑screw, eccentric and adapter sleeve—by speed, shock and maintenance ease.

Dimension charts tie shaft sizes to bolt patterns, load ratings and permissible misalignment; sealing and grease options are mapped to dusty, wet and hygienic environments.

Selection notes address shaft tolerances, thermal growth and relubrication intervals to stabilize performance.

Part‑number structure and interchange guidance streamline sourcing and fleet standardization.