3303 Angular Contact Ball Bearings

3303 Angular Contact Ball Bearing | 3303C / 3303AC / 3303B

The 3303 angular contact ball bearing is a widened double-row heavy-duty precision bearing engineered for high combined radial and axial loads. It features high structural rigidity, superior load capacity, low friction and quiet stable operation, ideal for medium and heavy-duty mechanical transmission systems. Offered in 3303C, 3303AC and 3303B contact angle types, plus bearing steel and stainless steel material options, this bearing delivers reliable performance in standard, humid and mildly corrosive industrial environments.

Difference Between 3303C, 3303AC and 3303B

3303C (15° Contact Angle): Features a 15° contact angle with ultra-low friction and excellent high-speed stability. It maintains accurate rotational precision with moderate axial load capacity, optimized for high-speed precision spindles and automated precision machinery.

3303AC (25° Contact Angle): Adopts a 25° contact angle with balanced radial and axial load resistance. It provides stable composite load performance and wide versatility, acting as the universal cost-effective solution for most precision machinery applications.

3303B (40° Contact Angle): Equipped with a 40° large contact angle for maximum axial load capacity. It steadily withstands heavy axial thrust at low and medium speeds, ideal for heavy-duty equipment with offset loads and large axial force.

Material Differences: Bearing Steel vs Stainless Steel

Bearing Steel (GCr15): GCr15 bearing steel serves as the standard material for 3303 series bearings. Professional heat treatment delivers high hardness, outstanding wear resistance and strong fatigue resistance, guaranteeing stable precision and extended service life in conventional dry industrial conditions.

Stainless Steel: Stainless steel 3303 bearings feature excellent rust-proof, anti-oxidation and weak corrosion resistance. They effectively resist moisture and minor contamination to prevent precision loss and corrosion failure, suitable for food machinery, medical equipment and high-humidity sanitary scenarios.

Product Features

Widened double-row structure enhances rigidity and load capacity compared with regular double-row bearings. Supports multi-directional combined radial and axial loads. Three contact angle options cover high-speed, universal and heavy axial load working conditions. Ensures high-precision, smooth and low-noise operation. Dual material grades balance cost performance and anti-corrosion capability for diverse industrial scenarios.

Application Scenarios

3303 series double-row angular contact ball bearings are widely used in heavy-duty precision motors, industrial compressors, hydraulic pumps, machine tool equipment and engineering machinery. Bearing steel models suit conventional industrial equipment; stainless steel versions adapt to damp, clean and lightly corrosive environments. 3303C for high-speed precision operation, 3303AC for general universal use, and 3303B for heavy axial load mechanical equipment.