3305 Angular Contact Ball Bearings

3305 Angular Contact Ball Bearing | 3305C / 3305AC / 3305B

The 3305 angular contact ball bearing is a widened double-row heavy-duty precision bearing built for high combined radial and axial loads. It provides high rigidity, large load capacity, low friction and consistent quiet operation, widely used in medium and heavy-duty transmission machinery. Available in 3305C, 3305AC and 3305B contact angle types with bearing steel and stainless steel material options, this bearing works reliably in standard, humid and lightly corrosive industrial environments.

Difference Between 3305C, 3305AC and 3305B

3305C (15° Contact Angle): Features a 15° contact angle with minimal friction and superior high-speed stability. It maintains precise rotation with moderate axial load capacity, ideal for high-speed precision spindles and automated machinery.

3305AC (25° Contact Angle): Adopts a 25° contact angle with balanced radial and axial load performance. With stable composite load resistance and strong versatility, it is the universal cost-effective option for most precision machinery applications.

3305B (40° Contact Angle): Equipped with a 40° large contact angle for maximum axial load capacity. It steadily handles 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 3305 series bearings. Professional heat treatment delivers 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 3305 bearings offer excellent rust-proof, anti-oxidation and weak corrosion resistance. They 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 improves rigidity and load capacity over standard double-row bearings. Supports multi-directional combined radial and axial loads. Three contact angle specifications fit high-speed, universal and heavy axial load working conditions. Delivers high-precision, smooth and low-noise operation. Dual material designs balance cost performance and corrosion resistance for diverse industrial uses.

Application Scenarios

3305 series double-row angular contact ball bearings are widely applied in heavy-duty precision motors, industrial compressors, hydraulic pumps, machine tools and engineering machinery. Bearing steel models suit conventional industrial equipment; stainless steel versions adapt to damp, clean and lightly corrosive environments. 3305C for high-speed precision operation, 3305AC for general universal use, and 3305B for heavy axial load equipment.