7211BW NSK Single Row Angular Contact Ball Bearing 55x100x21mm

The 7211BW Single Row Angular Contact Ball Bearing is designed to support combined radial loads and axial loads acting in one direction, making it suitable for precision machinery and high-speed industrial applications. Its angular contact design provides increased rigidity, stable running performance, and reliable load handling in compact bearing arrangements.

Manufactured from high-quality bearing steel and produced to precise dimensional tolerances, the 7211BW delivers dependable performance and durability under demanding operating conditions. The open bearing design allows efficient lubrication and effective heat dissipation, contributing to smooth operation and extended service life.

Boundary Dimensions

• Bore diameter (d): 55 mm

• Outside diameter (D): 100 mm

• Width (B): 21 mm

• Minimum chamfer dimension (r): 1.5 mm

• Minimum chamfer dimension (r1): 1.0 mm

Basic Load Ratings

• Basic dynamic load rating (Cr): 51,000 N

• Basic static load rating (C0r): 36,000 N

Speeds

• Limiting speed (grease lubrication): 4,000 min⁻¹

• Limiting speed (oil-bath lubrication): 5,600 min⁻¹

Internal Dimensions

• Effective load center (a): 43 mm

Abutment and Fillet Dimensions

• Minimum shaft abutment diameter (da): 64 mm

• Maximum housing abutment diameter (Da): 91 mm

• Maximum shaft or housing fillet radius (ra): 1.5 mm

Mass

• Approximate weight: 0.627 kg

The 7211BW Angular Contact Ball Bearing is commonly used in machine tool spindles, pumps, compressors, electric motors, gearboxes, and other precision mechanical assemblies where high load capacity, controlled axial support, and reliable performance are required.