‌625-ZZ Deep Groove Ball Bearing Technical Documentation‌

‌1. Product Overview‌

• ‌Model‌: 625-ZZ
• ‌Type‌: Double Shielded Deep Groove Ball Bearing
• ‌Precision Grade‌: Standard (P0)

‌2. Detailed Parameters‌

‌3. Performance Characteristics‌

• ‌Load Ratings‌:
  • Dynamic (Cr): 1.3 kN (133 kgf)
  • Static (Cor): 0.485 kN (49 kgf)
• ‌Speed Limits‌:
  • Grease Lubrication: 44,000 rpm
  • Oil Lubrication: 54,000 rpm
• ‌Sealing‌: Double-sided steel shields (ZZ) with NBR rubber gaskets
• ‌Material‌: Chrome steel (AISI 52100), Rockwell hardness 61-65 HRC

‌4. Technical Highlights‌

• ‌Low Torque Design‌: Optimized internal geometry reduces friction coefficient to 0.001-0.002
  .
• ‌Precision Tolerance‌: Bore diameter controlled within ±0.8μm for high-precision applications
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• ‌Environmental Resistance‌: Operating temperature range: -30°C to +120°C

‌5. Application Scenarios‌

• ‌Industrial‌: Vacuum pumps, textile machinery, miniature motors
• ‌Automotive‌: Fuel pumps, steering systems, ECU fans
• ‌Medical‌: Dental handpieces, surgical robotics
• ‌Consumer Electronics‌: Cooling fans, optical drives

‌4. Applications‌

• ‌Industrial Equipment‌: Small motors, pumps, and conveyor systems.
• ‌Automotive Components‌: Alternators, HVAC fans, and wheel hubs.
• ‌Precision Devices‌: Office automation (printers, scanners) and medical instruments.

Note: Speed limits are for grease lubrication; oil lubrication increases limits by 30-40%.

‌5. Brand Equivalents‌

• ‌SKF‌: 625-2Z
• ‌NSK‌: 625ZZ
• ‌FAG‌: 625-ZZ
• ‌KOYO‌: 625-RZ

‌6. Maintenance Tips‌

• ‌Lubrication‌: Use lithium-based grease (NLGI Grade 2)
• ‌Alignment‌: Max. misalignment angle 2° to prevent uneven wear
• ‌Storage‌: Keep in dry conditions (humidity <60%)
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