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638 Series
Home Deep Groove Ball Bearings 638 Series

63804-ZZ Compact Deep Groove Ball Bearing for Electric Motors & Industrial Robotics | 20×32×10 mm

63804-ZZ Compact Deep Groove Ball Bearing for Electric Motors & Industrial Robotics | 20×32×10 mm

Built for mechanical systems that require excellent load capacity within restricted dimensions, the 63804-ZZ represents a highly efficient compact deep groove ball bearing. Equipped with twin steel shields (ZZ), this model effectively blocks external debris while trapping the factory-applied lubricant inside. Since these metal shields hover just above the inner ring without making physical contact, the 63804-ZZ minimizes rotational resistance. This makes it an outstanding solution for 20mm shaft applications such as automated factory equipment, electric vehicle motors, and precision gearboxes.

63804-ZZ Deep Groove Ball Bearing 20x32x10 mm | Compact Architecture | Double Shielded

Produced to meet rigorous ISO precision standards, this component leverages a light-series framework to support substantial radial and moderate axial loads in space-limited assemblies. The built-in metal shielding ensures frictionless defense against solid contaminants, thereby prolonging the lifespan of the precisely honed raceways. By avoiding the heat generation typical of rubber contact seals, the 63804-ZZ smoothly operates at elevated speeds—perfect for demanding B2B industrial environments and continuous-duty electric drives.

63804-ZZ Compact Deep Groove Ball Bearing for Electric Motors & Industrial Robotics | 20×32×10 mm

Comprehensive Applications

Tailored for reliable power transmission and highly compact mechanical setups:

Industrial Automation & Robotics
  • Articulating joints in robotic arms
  • Conveyor system drive rollers
  • Precision packaging and sorting machinery
  • Automated guided vehicle (AGV) drivetrains
Electric Motors & Power Drives
  • High-efficiency AC and DC electric motors
  • Power tool spindles and internal gearboxes
  • Industrial ventilation and blower systems
  • Pump shafts in fluid handling equipment
Bicycles & Lightweight Transport
  • Mountain bike (MTB) suspension frame pivots
  • E-bike hub motors and bottom brackets
  • Lightweight motorcycle wheel assemblies
  • Electric scooter drivetrains
Textile & Printing Machinery
  • High-speed spinning and weaving components
  • Commercial printing press rollers
  • Fabric cutting and sewing mechanization
  • Industrial labeling machines

Key Performance Features

01. Optimized Space-to-Load Ratio

With an inner diameter of 20mm and a compact 32mm outer diameter, the 10mm width of this bearing offers a highly robust cross-section. This specific geometry allows engineers to maximize load distribution (supporting up to 4.02 kN dynamic load) while keeping the overall housing assembly exceptionally compact and lightweight.

02. Non-Contact Shielding Efficiency

By utilizing dual pressed-steel shields (ZZ), the 63804-ZZ secures the internal rolling elements against dirt and particulates without introducing physical drag. This frictionless shielding approach dramatically cuts down on heat accumulation and startup torque, ensuring cooler, more energy-efficient running conditions even near its 21,000 RPM threshold.

03. Premium Chrome Steel Construction (GCr15)

Manufactured from high-purity, vacuum-degassed GCr15 chrome steel, the rings and balls are subjected to advanced heat treatments for superior fatigue life and Rockwell hardness. Sourced and processed for dimensional stability, these bearings guarantee smooth, low-vibration performance right off the assembly line.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63800 Series (Compact / Light Section)
Basic Designation 63804
Suffix ZZ (Double Steel Shields)
Bore Diameter (d) 20 mm
Outer Diameter (D) 32 mm
Width (B) 10 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Shield Material Pressed Steel Plate
Dynamic Load Rating (Cʳ) 4.02 kN
Static Load Rating (C₀ʳ) 2.46 kN
Limiting Speed (Grease) 21,000 r/min
Limiting Speed (Oil) 25,000 r/min
Weight (approx.) 0.024 kg

Interchange Part Numbers

Directly replaces the following equivalent manufacturer parts:

  • SKF: 63804-2Z
  • NSK: 63804ZZ
  • FAG: 63804-2Z
  • KOYO: 63804ZZ
  • EZO: 63804ZZ
  • NTN: 63804ZZ

Design & Configuration

Our standard 63804-ZZ comes pre-lubricated with a premium industrial-grade grease formulated for low-noise and high-speed efficiency. For specialized operational demands, Welink Bearing can provide this model with a C3 internal radial clearance to accommodate higher thermal expansion, or manufacture it from AISI 440C stainless steel for moisture-heavy environments. If your machinery faces severe dust or direct liquid exposure, please inquire about our 63804-2RS (rubber-sealed) alternatives.

"Bridging the gap between structural compactness and heavy-duty reliability, the 63804-ZZ is engineered to power the next generation of industrial drives and automation."

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63804-ZZ Compact Deep Groove Ball Bearing for Electric Motors & Industrial Robotics | 20×32×10 mm

Built for mechanical systems that require excellent load capacity within restricted dimensions, the 63804-ZZ represents a highly efficient compact deep groove ball bearing. Equipped with twin steel shields (ZZ), this model effectively blocks external debris while trapping the factory-applied lubricant inside. Since these metal shields hover just above the inner ring without making physical contact, the 63804-ZZ minimizes rotational resistance. This makes it an outstanding solution for 20mm shaft applications such as automated factory equipment, electric vehicle motors, and precision gearboxes.

Details

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