7820CDB/GNP5 Duplex Back‑to‑Back Super Precision Angular Contact Ball Bearing

7820CDB/GNP5 is a pre‑matched back‑to‑back duplex super precision angular contact ball bearing with 15° contact angle, finished to GNP5 high precision tolerance. It delivers high rigidity, stable preload and excellent rotational accuracy, widely applied on CNC spindles, grinding machines and high‑precision automation equipment that require high speed and bidirectional combined load capacity.

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• 15° small contact angle reduces friction and supports ultra‑high rotating speed
• DB back‑to‑back paired structure withstands radial, bidirectional axial loads and tilting moments
• GNP5 super precision grade guarantees ultra‑low runout and consistent spindle accuracy
• Universal ground matching for direct installation without manual pairing adjustment
• Open structure supports continuous re‑lubrication for long service life
• GCr15 high chromium bearing steel with strict heat treatment for outstanding wear resistance

Helps reduce maintenance cost and improve machine performance

This bearing is widely used in:

• CNC machining center main spindles
• High‑precision internal & external grinding machines
• High‑speed rotary positioning equipment
• Precision testing instrument rotary shafts
• Automation high‑speed spindle assemblies

Ideal for customers looking for reliable and long‑life bearing solutions

Full technical data and drawings available upon request

• 25+ years experience in industrial precision bearing manufacturing
• Exported to 50+ countries worldwide
• Rich experience in OEM & custom precision bearing projects
• Strict multi‑step precision inspection before shipment
• Fast response within 24 hours
• Stable bulk supply for long‑term cooperation

We focus on quality, reliability, and long‑term partnership

• Raw material composition inspection
• Precision grinding & raceway profile detection
• Heat treatment hardness & metallurgy test
• Preload matching & rotational accuracy testing
• Final dimensional and surface inspection before delivery

Ensuring consistent performance for every bearing

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• Professional technical support from bearing engineers
• Custom preload & precision solution suggestions
• Competitive factory direct price

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