3301 Angular Contact Ball Bearings

3301 Angular Contact Ball Bearing | 3301C / 3301AC / 3301B

The 3301 angular contact ball bearing is a widened double-row heavy-duty precision bearing, optimized for high combined radial and axial loads. It delivers high rigidity, large load capacity, low friction and quiet stable operation, ideal for medium and heavy-duty mechanical transmission systems. Available in 3301C, 3301AC and 3301B contact angle types with bearing steel and stainless steel options, it ensures reliable performance in standard, humid and mildly corrosive industrial environments.

Difference Between 3301C, 3301AC and 3301B

3301C (15° Contact Angle): Features a 15° contact angle with ultra-low friction and excellent high-speed stability. It retains high rotational precision with moderate axial load capacity, suitable for high-speed precision spindles and automated precision machinery.

3301AC (25° Contact Angle): Adopts a 25° contact angle with balanced radial and axial load resistance. It offers stable composite load performance and great versatility, serving as the universal cost-effective choice for most standard precision machinery applications.

3301B (40° Contact Angle): Equipped with a 40° large contact angle for enhanced axial load capacity. It steadily withstands heavy axial thrust at low to medium speeds, perfect for heavy-duty equipment with offset loads and large axial force.

Material Differences: Bearing Steel vs Stainless Steel

Bearing Steel (GCr15): GCr15 bearing steel is the standard material for 3301 series bearings. Professional heat treatment provides high hardness, outstanding wear resistance and strong fatigue resistance, maintaining stable precision and long service life in conventional dry industrial conditions.

Stainless Steel: Stainless steel 3301 bearings possess excellent rust-proof, anti-oxidation and weak corrosion resistance. They effectively resist moisture and minor contamination to prevent precision loss and corrosion failure, ideal for food machinery, medical equipment and high-humidity sanitary scenarios.

Product Features

Widened double-row structure boosts rigidity and load capacity higher than standard double-row bearings. Supports multi-directional combined radial and axial loads. Three contact angle specifications adapt to high-speed, universal and heavy axial load working demands. Ensures smooth, low-noise and high-precision operation. Dual material grades balance cost performance and anti-corrosion ability for diverse industrial applications.

Application Scenarios

3301 series double-row angular contact ball bearings are widely applied in heavy-duty precision motors, industrial compressors, hydraulic pumps, machine tool equipment and engineering machinery. Bearing steel models fit conventional industrial equipment; stainless steel versions adapt to damp, clean and lightly corrosive environments. 3301C for high-speed precision operation, 3301AC for general universal use, and 3301B for heavy axial load mechanical equipment.