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63 Series
Home Deep Groove Ball Bearings 63 Series

6305-ZZ Deep Groove Ball Bearing For Electric Motors & Industrial Applications | 25x62x17 mm

6305-ZZ Deep Groove Ball Bearing For Electric Motors & Industrial Applications | 25x62x17 mm

The 6305-ZZ is a Premium Single Row Deep Groove Ball Bearing designed for demanding applications that require reliable performance and durability. Featuring double metal shields (ZZ) on both sides, this metric bearing provides effective protection against dust and contamination while maintaining low rotational friction. With a 25mm bore, 62mm outer diameter, and 17mm width, it is ideal for electric motors, pumps, gearboxes, conveyors, and various machinery where robust construction and long service life are essential.

6305-ZZ Deep Groove Ball Bearing 25x62x17 mm | ISO 63 Series – Medium Duty | Double Shielded

Premium precision bearing featuring the universal deep groove geometry. Engineered for smooth, high‑speed operation up to 13,000 r/min (Grease) and 16,000 r/min (Oil). The 6305-ZZ is capable of supporting moderate radial loads and light axial loads, making it a versatile component for electric motors, industrial machinery, agricultural equipment, and automotive applications.

6305-ZZ Deep Groove Ball Bearing For Electric Motors & Industrial Applications | 25x62x17 mm

Comprehensive Applications

Ideally suited for a wide range of industrial and automotive uses:

Electric Motors & Drives
  • AC & DC Electric Motors
  • Fans & Blowers
  • Pumps & Compressors
  • Gearboxes & Power Transmission
Automotive & Transportation
  • Alternators & Starters
  • Water Pumps
  • Steering Systems
  • Light‑duty Wheel Hubs
Industrial Machinery
  • Conveyor Systems
  • Textile Machinery
  • Machine Tool Spindles
  • Agricultural Equipment
General Engineering
  • Construction Equipment
  • Material Handling
  • Food Processing Machinery
  • Printing & Packaging Machines

Key Performance Features

01. Design & Protection

The double, non‑contact pressed steel shields offer robust dual‑side protection against dust and solid contaminants. This design effectively retains lubrication, extends service life, and ensures low friction operation suitable for a wide range of industrial applications.

02. Robust Construction & Load Capacity

The 63 series design features an optimized internal geometry that balances high radial load capacity with moderate axial load capability. Its robust construction ensures long‑term reliability under moderate to heavy loads, making it a preferred choice for electric motors, pumps, and gearboxes.

03. High‑Speed & Smooth Operation

Manufactured to fine precision tolerances, with availability in higher grades (up to P5 precision grade). The refined raceway finish and accurate ball complement deliver exceptionally smooth, quiet, and stable rotation with minimal vibration—perfect for continuous‑duty machinery and sensitive equipment.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63 Series – Medium Duty
Basic Designation 6305
Suffix ZZ (Both sides with steel shields)
Bore Diameter (d) 25 mm
Outer Diameter (D) 62 mm
Width (B) 17 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class P0 / P6 / P5 (ABEC 1/3/5) Available
Cage Material Steel Stamped or Reinforced Nylon
Dynamic Load Rating (Cʳ) 23.4 kN
Static Load Rating (C₀ʳ) 11.6 kN 
Limiting Speed (Grease) 12,000 r/min
Limiting Speed (Oil) 17,000 r/min
Weight (approx.) 230 g

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 6305-ZZ
  • NSK: 6305ZZ
  • FAG: 6305ZZ
  • NTN: 6305ZZ
  • KOYO: 6305ZZ
  • Timken: 6305ZZ

Design & Configuration

The 6305-ZZ is equipped with double pressed steel shields as standard. For applications requiring enhanced sealing against moisture or fine contaminants, configurations with double rubber contact seals (6305-2RS) are available as an alternative.

"For general purpose electric motors and industrial machinery, the 6305-ZZ offers a perfect balance of protection and performance."

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Request a Quote for Ball Bearings

Request a Quote for Ball Bearings
Please submit your inquiry below for detailed product and pricing information. We will get back to you within 24 hours.
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