1. Product Overview The 50BNR19DB is factory pre-matched back-to-back duplex ultra-high speed angular contact ball bearing, belonging to BNR19 series with 18° small contact angle for ultra-high limiting speed. The DB back-to-back arrangement delivers excellent axial rigidity and strong anti-overturn performance, specially developed for high-speed precision machine tool spindles requiring bidirectional axial load support and low heat generation. 👉 Get a quote within 24 hours