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63 Series
Home Deep Groove Ball Bearings 63 Series

6303-ZZ Double Metal Shielded Deep Groove Ball Bearing For Electric Motors And Industrial Machinery | 17×47×14 mm

6303-ZZ Double Metal Shielded Deep Groove Ball Bearing For Electric Motors And Industrial Machinery | 17×47×14 mm

The 6303-ZZ is a Double Metal Shielded Deep Groove Ball Bearing engineered for applications demanding reliable protection against dust and solid contaminants while maintaining high-speed capability. Equipped with two non-contact metal shields (ZZ) on both sides, this bearing effectively prevents ingress of larger particles and retains grease lubrication with minimal friction. With a 17 mm bore, it is a versatile choice for electric motors, pumps, compressors, and industrial equipment where compact dimensions, moderate load capacity, and long service life are required.

6303-ZZ Deep Groove Ball Bearing 17×47×14 mm | ISO 03 Series – Light | Double Metal Shielded

Featuring a deep groove raceway design, this shielded bearing is rated for stable operation at speeds up to 18,000 r/min (Oil). Designed to accommodate moderate radial loads and light axial loads in both directions, the 6303-ZZ provides reliable performance in applications such as electric motors, fans, and general machinery where effective dust protection and low friction are essential for consistent operation.

6303-ZZ Double Metal Shielded Deep Groove Ball Bearing For Electric Motors And Industrial Machinery | 17×47×14 mm

Comprehensive Applications

Designed for a wide range of applications requiring shielded protection, moderate load handling, and reliable performance in space-constrained assemblies:

Industrial & General Machinery
  • Pumps, Compressors & Blowers
  • Conveyor Systems & Rollers
  • Agricultural Machinery & Irrigation Equipment
  • Electric Motors & Gearboxes
Automotive & Transportation
  • Cooling Fan Motors
  • Power Steering Pumps
  • Material Handling Equipment & Caster Wheels
  • Alternators & Starter Motors
Consumer & Commercial Equipment
  • Commercial Kitchen Equipment
  • Vending Machines & Coin Mechanisms
  • Fitness & Exercise Machines
  • HVAC Units & Ventilation Fans
Electric Motors & Drives
  • Power Tools & Hand Tools
  • Household Appliance Motors
  • AC/DC Motors & Fan Motors
  • Servo Motors & Encoders

Key Performance Features

01. Optimized Load Capacity in Compact Dimensions

Manufactured to ISO 03 series dimensions (17×47×14 mm), this bearing delivers a higher load capacity compared to smaller series, while maintaining a compact profile. It is ideal for applications where space is limited but increased radial and axial loads must be supported.

02. High-Precision Manufacturing for Smooth & Quiet Operation

Available in precision classes up to ABEC 5 (P5), the 6303-ZZ features refined internal geometry and superfinished raceways to ensure minimal vibration, low noise, and consistent torque across a wide range of operating speeds and load conditions.

03. Effective Double Metal Shield Design

Two non-contact metal shields (ZZ) provide robust protection against dust, dirt, and fibrous contaminants while preserving lubrication and reducing frictional drag. This design is particularly suitable for applications operating in moderately dirty environments and where high rotational speeds are required.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 03 Series – Light
Basic Designation 6303
Suffix ZZ (Double Metal Shields)
Bore Diameter (d) 17 mm
Outer Diameter (D) 47 mm
Width (B) 14 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) 13.5 kN
Static Load Rating (C₀ʳ) 6.8 kN 
Limiting Speed (Grease) 14,000 r/min
Limiting Speed (Oil) 18,000 r/min
Weight (approx.) 110 g

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 6303-Z
  • NSK: 6303ZZ
  • FAG: 6303-ZZ
  • NTN: 6303ZZ
  • KOYO: 6303ZZ

Design & Configuration

The 6303-ZZ is supplied as standard with double metal shields, offering an excellent balance between protection and speed capability. For applications requiring enhanced sealing against moisture and fine particles, the double rubber-sealed version (6303-2RS) is also available.

"Select the 6303-ZZ for electric motors, pumps, and industrial machinery where reliable dust protection and high-speed operation are critical for long-term performance."

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