3204 Angular Contact Ball Bearings

3204 Angular Contact Ball Bearing | 3204C / 3204AC / 3204B

The 3204 angular contact ball bearing is a double-row high-rigidity precision bearing designed to withstand combined radial and axial loads. With a compact structure, low friction and stable low-noise operation, it is widely used in space-limited medium and heavy-duty precision transmission equipment. Offered in 3204C, 3204AC and 3204B contact angle types, plus bearing steel and stainless steel material options, this bearing delivers stable and reliable performance in dry, humid and mildly corrosive industrial environments.

Difference Between 3204C, 3204AC and 3204B

3204C (15° Contact Angle): Features a 15° contact angle with ultra-low friction and superior high-speed stability. It maintains high rotational precision with moderate axial load capacity, ideal for compact high-speed spindles and precision automated machinery.

3204AC (25° Contact Angle): Adopts a 25° contact angle with balanced radial and axial load resistance. It provides stable composite load performance and strong versatility, serving as the universal cost-effective option for most precision machinery applications.

3204B (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 compact equipment with offset loads and heavy axial force.

Material Differences: Bearing Steel vs Stainless Steel

Bearing Steel (GCr15): GCr15 bearing steel is the standard material for 3204 series bearings. Professional heat treatment provides high hardness, excellent wear resistance and strong fatigue resistance, ensuring long-term stable precision and service life in conventional dry industrial conditions.

Stainless Steel: Stainless steel 3204 bearings deliver outstanding 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

Double-row structure greatly improves rigidity and load capacity compared with single-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 designs balance cost performance and anti-corrosion capability for diverse working environments.

Application Scenarios

3204 series double-row angular contact ball bearings are widely applied in compact precision motors, small machine tool spindles, industrial pumps, compressors and precision automation machinery. Bearing steel models fit conventional indoor industrial equipment; stainless steel versions adapt to damp, sanitary and lightly corrosive environments. 3204C for high-speed precision operation, 3204AC for general universal use, and 3204B for heavy axial load equipment.