1. Product Overview The 7204CDB back‑to‑back (DB) duplex angular contact ball bearing consists of two 7204CD single bearings pre‑ground and matched back‑to‑back. With 15‑degree CD contact angle, DB arrangement provides high moment rigidity, bears combined radial load and bidirectional axial loads, factory pre‑preloaded to eliminate manual pairing errors. It is widely used for precision machine tool spindles, high‑frequency motors and automation rotary positioning units. 👉 Get