624-ZZ Deep Groove Ball Bearing Technical Documentation
1. Product Overview
- Model: 624-ZZ
- Type: Double Shielded Deep Groove Ball Bearing
- Precision Grade: Standard (P0)
2. Detailed Parameters
Model |
d (mm) |
D (mm) |
B (mm) |
Cr (kN) |
Cor (kN) |
Speed (rpm) |
623-ZZ |
3 |
10 |
4 |
0.65 |
0.23 |
48,000 |
624-ZZ |
4 |
13 |
5 |
1.3 |
0.485 |
44,000 |
625-ZZ |
5 |
16 |
5 |
1.8 |
0.68 |
38,000 |
626-ZZ |
6 |
19 |
6 |
2.3 |
0.92 |
32,000 |
627-ZZ |
7 |
22 |
7 |
3.1 |
1.4 |
28,000 |
628-ZZ |
8 |
24 |
8 |
3.9 |
1.8 |
24,000 |
629-ZZ |
9 |
26 |
8 |
4.7 |
2.3 |
20,000 |
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
.
- 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: 624-2Z
- NSK: 624ZZ
- FAG: 624-ZZ
- KOYO: 624-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%)
.