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64 Series
Home Deep Groove Ball Bearings 64 Series

6404 Deep Groove Ball Bearing For Electric Motors & Industrial Machinery | 20×72×19 mm

6404 Deep Groove Ball Bearing For Electric Motors & Industrial Machinery | 20×72×19 mm

The 6404 is a Single Row Deep Groove Ball Bearing designed for dependable performance in a wide spectrum of industrial and mechanical applications. Featuring a deep groove raceway geometry, this bearing efficiently accommodates radial loads as well as moderate axial loads in both directions. With a 20 mm bore, 72 mm outer diameter, and a 19 mm width, it provides a robust and versatile solution for various machinery. Available with different sealing options (open, metal shields, or rubber seals), it is ideal for electric motors, pumps, gearboxes, fans, and other equipment requiring smooth, low‑noise operation and long service life.

6404 Deep Groove Ball Bearing 20x72x19 mm | 64 Series | Open Type (with sealing options available)

A widely used industrial bearing featuring the standard deep groove raceway geometry. Engineered for stable and reliable operation at speeds up to 15,000 r/min (grease lubrication) with a reference speed of 24,000 r/min. The 6404 combines a robust construction with high load capacity, making it a reliable choice for various industrial machinery, electric motors, and mechanical transmissions.

6404 Deep Groove Ball Bearing For Electric Motors & Industrial Machinery | 20×72×19 mm

Comprehensive Applications

Ideal for a broad range of industrial equipment and mechanical drives:

Gearboxes & Transmissions
  • Industrial Gearbox Input/Output Shafts
  • Transmission Housings
  • Differential Mechanisms (light‑duty)
  • Speed Reducer Bearings
Machine Tools & General Industrial
  • Light‑Duty Spindle Supports
  • Printing Press Rollers
  • Packaging Machine Feed Mechanisms
  • Textile Machinery Spindles
Electric Motors & Drives
  • AC and DC Electric Motor Shafts
  • Servo and Stepper Motor Supports
  • Pump Motor Bearings
  • Cooling Fan Motors
Pumps & Compressors
  • Centrifugal Pump Impeller Supports
  • Hydraulic Pump Rotors
  • Vacuum Pump Bearings
  • Air Compressor Crankshafts

Key Performance Features

01. High Load Capacity

The 6404 features a deep groove raceway and a robust internal geometry, enabling it to handle substantial radial loads and moderate axial loads in both directions. With dynamic and static load ratings of 30.7 kN and 15 kN respectively, it is well‑suited for demanding industrial applications.

02. Versatile Configuration

Available in open, shielded (ZZ), or sealed (2RS) versions, the 6404 can be tailored to specific application requirements. The open design allows for high‑speed operation and re‑lubrication, while shielded or sealed variants provide protection against contamination and lubricant retention.

03. Durable Construction

Manufactured from high‑quality chrome steel (GCR15 / SAE 52100) and precision ground, the 6404 ensures long‑lasting performance under continuous operation. Its sturdy design resists wear and fatigue, contributing to extended service life in harsh environments.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 64 Series
Basic Designation 6404
Suffix Open (no suffix), ZZ (metal shields), 2RS (rubber seals) available
Bore Diameter (d) 20 mm
Outer Diameter (D) 72 mm
Width (B) 19 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel or Polyamide (depending on version)
Dynamic Load Rating (Cʳ) 30.7 kN
Static Load Rating (C₀ʳ) 15 kN
Limiting Speed (Grease) 24,000 r/min
Limiting Speed (Oil) 15,000 r/min
Weight (approx.) 0.4 kg

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 6404, 6404-2Z, 6404-2RS1
  • NSK: 6404, 6404ZZ, 6404DDU
  • FAG: 6404, 6404.2ZR, 6404.2RSR
  • NTN: 6404, 6404LLB, 6404LLU
  • Generic: 6404, 6404ZZ, 6404-2RS

Design & Configuration

The 6404 is typically supplied as an open bearing (without seals or shields), allowing maximum speed and flexibility for re‑lubrication. For applications requiring protection against dust or moisture, shielded (ZZ) or sealed (2RS) versions are available upon request. The bearing is pre‑lubricated with high‑quality grease in its sealed variants, while open bearings require initial lubrication during installation. Its standard dimensions conform to ISO series 64, ensuring interchangeability with major bearing brands worldwide.

"For electric motors, pumps, gearboxes, and a wide range of industrial machinery, the 6404 deep groove ball bearing offers a perfect balance of load capacity, speed capability, and durability. Its versatile design and availability with different sealing options make it a go‑to choice for maintenance and OEM applications."

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Details
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The 6404-2RS is a Single Row Deep Groove Ball Bearing with Contact Rubber Seals engineered for reliable performance in demanding industrial environments. With a 20 mm bore, 72 mm outer diameter, and a 19 mm width, it provides a robust and versatile solution for various machinery applications. Featuring the standard deep groove raceway geometry, this bearing efficiently accommodates radial loads as well as moderate axial loads in both directions. Equipped with double rubber seals (2RS) for effective contamination protection and lubricant retention, it is ideally suited for electric motors, pumps, agricultural equipment, and industrial machinery operating in dusty or moist conditions where maintenance access is limited.

Details

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