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63 Series
Home Deep Groove Ball Bearings 63 Series

6305-ZZ Deep Groove Ball Bearing | Industrial Grade Shielded Radial Bearing | 25×62×17 mm

6305-ZZ Deep Groove Ball Bearing | Industrial Grade Shielded Radial Bearing | 25×62×17 mm

The 6305-ZZ is a high-load capacity radial ball bearing engineered for demanding mechanical environments. It is a core component for machinery requiring high rotational stability and durability under significant radial loads. Equipped with dual non-contact metal shields (ZZ), this bearing ensures that factory-packed lubrication is retained while preventing the ingress of dust and moderate debris without increasing frictional torque. With a 25mm bore and 62mm outer diameter, it serves as a robust solution for medium-sized electric motors, industrial pumps, and automotive drivetrains.

6305-ZZ Deep Groove Ball Bearing 25x62x17 mm | Metric 6300 Series | Dual Metal Shields

Designed for heavy-duty rotation and long-term reliability, the 6305-ZZ features deep, honed raceway tracks that allow for both radial and moderate axial loads in both directions. Unlike smaller micro-bearings, the 6305-ZZ is built to withstand higher vibration environments and mechanical stress. The ZZ metal shielding configuration is particularly effective in high-speed applications where rubber seals might cause overheating due to friction. This makes the 6305-ZZ an essential part for power tools, agricultural machinery, and HVAC systems where consistent performance is mandatory.

6305-ZZ Deep Groove Ball Bearing | Industrial Grade Shielded Radial Bearing | 25×62×17 mm

Comprehensive Applications

The 6305-ZZ is widely utilized across sectors requiring a balance of speed and load-bearing strength:

Electric Motors & Power Generation
  • Industrial AC/DC motors (2-5 HP range)
  • Automotive alternators and starter motors
  • Generators and power distribution units
  • Pool and spa pump motors
Home Appliances & HVAC
  • Commercial washing machine drum supports
  • Large ventilation and exhaust fans
  • Air conditioning compressor units
  • High-torque floor cleaning equipment
Power Tools & Manufacturing
  • Heavy-duty circular saws and grinders
  • Pneumatic compressors and blowers
  • Conveyor system rollers and pulleys
  • Industrial woodworking machinery
Automotive & Transportation
  • Vehicle transmission and gearbox assemblies
  • Motorcycle wheel hubs and engines
  • Agricultural tractor drive systems
  • Light-duty trailer axles

Key Performance Features

01. Optimized Load-to-Speed Ratio

The 6305-ZZ belongs to the "Medium" 6300 series, which offers larger steel balls and thicker rings than the 6000 or 6200 series. This architecture provides a significantly higher dynamic load rating while still maintaining the ability to reach high RPMs without excessive heat buildup.

02. Enhanced Thermal & Structural Stability

Manufactured from vacuum-degassed GCr15 chrome steel, the 6305-ZZ is heat-treated to ensure dimensional stability. The rigid steel cage and precision-ground raceways prevent deformation during heavy-duty cycles, extending the bearing's service life in harsh industrial conditions.

03. Low-Maintenance Shielded Design

The dual-shield (ZZ) configuration allows for a "fit and forget" installation. Pre-filled with premium lithium-based grease, the bearing requires no additional lubrication throughout its lifespan in clean to moderately dusty environments, reducing operational downtime for maintenance teams.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6300 Series (Metric)
Basic Designation 6305
Suffix ZZ (Double Metal 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 Standard / P5 Grade Available
Cage Material Riveted Steel
Dynamic Load Rating (Cʳ) 23.6 kN
Static Load Rating (C₀ʳ) 11.5 kN
Limiting Speed (Grease) 12,000 r/min
Limiting Speed (Oil) 15,000 r/min
Weight (approx.) 0.232 kg

Interchange Part Numbers

Fully interchangeable with premium global brands:

  • SKF: 6305-2Z / 6305-ZZ
  • NSK: 6305ZZ
  • FAG6305-2Z
  • NTN: 6305ZZ
  • KOYO: 6305ZZ
  • NMB: 6305ZZ

Design & Configuration

The 6305-2Z is engineered for long-cycle reliability, coming pre-filled with a high-performance synthetic grease designed to withstand the thermal demands of continuous industrial rotation. This "lubricated-for-life" configuration minimizes maintenance costs in clean-to-moderate environments. For high-speed motor applications or vertical shaft mounting where thermal expansion is a factor, we provide C3 internal clearance options to ensure optimal running accuracy. Should your machinery operate in environments with high humidity, fine dust, or direct liquid splashing, we recommend the 6305-2RS (contact rubber seals) to provide the highest level of contaminant exclusion and lubricant retention.

"Combining structural rigidity with low-friction performance, the 6305-2Z is the industry-standard solution for high-torque electric motors and heavy-duty power transmission."

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