3304 Angular Contact Ball Bearings

3304 Angular Contact Ball Bearing | 3304C / 3304AC / 3304B

The 3304 angular contact ball bearing is a widened double-row heavy-duty precision bearing designed for high combined radial and axial loads. It boasts high rigidity, large load capacity, low friction and low-noise stable operation, suitable for medium and heavy-duty mechanical transmission systems. Available in 3304C, 3304AC and 3304B contact angle types with bearing steel and stainless steel options, this bearing ensures stable and reliable performance in standard, humid and mildly corrosive industrial environments.

Difference Between 3304C, 3304AC and 3304B

3304C (15° Contact Angle): Comes with a 15° contact angle, featuring ultra-low friction and excellent high-speed stability. It maintains high rotational precision with moderate axial load capacity, ideal for high-speed spindles and precision automated machinery.

3304AC (25° Contact Angle): Adopts a 25° contact angle with balanced radial and axial load resistance. It delivers stable composite load performance and strong versatility, serving as the universal cost-effective option for most precision machinery applications.

3304B (40° Contact Angle): Equipped with a 40° large contact angle for enhanced axial load capacity. It reliably withstands heavy axial thrust at low and 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 3304 series bearings. Professional heat treatment provides high hardness, excellent wear resistance and strong fatigue resistance, ensuring stable precision and long service life in conventional dry industrial conditions.

Stainless Steel: Stainless steel 3304 bearings offer superior rust-proof, anti-oxidation and weak corrosion resistance. They effectively resist moisture and minor contamination to avoid precision loss and corrosion failure, suitable for food machinery, medical equipment and high-humidity sanitary scenarios.

Product Features

Widened double-row structure greatly improves structural rigidity and load capacity compared with ordinary 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 conditions. Ensures high-precision, smooth and quiet operation. Dual material grades balance cost performance and anti-corrosion ability for diverse industrial applications.

Application Scenarios

3304 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. 3304C for high-speed precision operation, 3304AC for general universal use, and 3304B for heavy axial load mechanical equipment.