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H-type: Features ceramic balls (silicon nitride
Available with brass
Worm shaft is case-hardened steel (20Cr)
5°–3° typically)
TC fan type)
Special Bearing NBC AXXX to TXXX series PART NO:TMB6203A/42LU H-type: Features ceramic balls (silicon1. AST ASTB ASTN ASTBG Series These are special application bearings not standard deep groove types. AST ASTB ASTN ASTBG denote NBCs customized angular contact, special geometry, or hybrid steel combinations used in machine tools, aerospace, or automotive fans. Features: High speed and high temperature performance. Precision grades (P5, P6, or P4). Special internal clearances (C3, CS23). Often paired or duplex matched for axial radial load balance. 2.
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