6304DDU – Single-Row Deep Groove Ball Bearing, Sealed

The 6304DDU is a single-row deep groove ball bearing with a 20 mm bore, 52 mm outside diameter, and 15 mm width. Rubber seals on both sides keep the grease in and contaminants out. It carries radial loads and axial loads in both directions, with a dynamic load rating of 17.5 kN and a grease-lubricated speed limit of 10,000 min⁻¹. Low friction torque, noise, and vibration make it a common choice for electric motors, servo and stepper motors, conveyors, pumps, and agricultural and textile machinery

Technical Specifications

• Brand: NSK (to be confirmed)
• Type: Single-Row Deep Groove Ball Bearing
• Sealing: Rubber seals both sides (DDU), grease lubricated
• Bore Diameter (d): 20 mm
• Outside Diameter (D): 52 mm
• Width (B): 15 mm
• Chamfer (r min.): 1.1 mm
• Limiting Speed (grease): 10,000 min⁻¹
• Number of Balls: 7
• Ball Diameter: 9.525 mm
• Calculation Factor (fo): 12.4
• Shaft Abutment Diameter (da): 26.5 to 28 mm
• Housing Abutment Diameter (Da max.): 45.5 mm
• Fillet Radius (ra max.): 1 mm
• Mass: approx. 0.145 kg