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625 / 625ZZ / 625-2RS Miniature Ball Bearing (5mm x 16mm x 5mm)
- · Inner Diameter: 5mm
- · Outer Diameter: 16mm
- · Width: 5mm
- · Precision Rating: P0
- · Clearance: C0
- · Sealing Type: ZZ
- · Number of Row: Single Row
- · Material: Chrome Steel GCR15
- · Grease RPM Limit: 2000 RPM
- · Lubrication: Grease
Product Overview
High-Precision 625 Series (625ZZ / 625-2RS) Miniature Deep Groove Ball Bearing
The 625 Series Miniature Ball Bearing is a standard metric single-row deep groove ball bearing engineered for high-precision, low-vibration, and high-speed rotary applications. Featuring a standard bore size of 5.0mm (0.197″), an outer diameter of 16.0mm (0.630″), and a width of 5.0mm (0.197″), the 625 series is one of the most widely used bearings in 3D printing V-slot wheels, micro stepper motors, and precision robotics.
High-Grade Chrome Steel & Flexible Shielding Options
Manufactured from high-carbon chromium bearing steel (GCr15 / AISI 52100), the inner ring, outer ring, and precision steel balls undergo specialized thermal heat treatment to reach high hardness (HRC 60-65) and structural fatigue endurance. Depending on environmental demands, customers can choose between non-contact metal shields (ZZ designation) for high-speed low-friction running, or rubber contact seals (2RS designation) for maximum defense against ambient dust and particulates.
Low Friction & Smooth High-Speed Performance
Equipped with precision-honed raceway grooves and a balanced steel ribbon cage, the 625 bearing delivers low rotational resistance, low acoustic noise, and smooth running characteristics at speeds up to 43,000 RPM. Its tight dimensional tolerances guarantee reliable radial load support and minimal axial play under continuous operation.
Custom Manufacturing & Material Options
To support specialized industrial and OEM application environments, custom configurations are available upon request:
- Stainless Steel Options: Stainless steel (SUS440C / SUS304) construction for damp, corrosive, or food-grade applications.
- Flanged Ring Design: Flanged outer ring model (F625) available for simplified housing mounting and axial location.
- Ceramic Hybrid Options: Silicon nitride (Si3N4) or zirconia (ZrO2) ceramic ball options for low-friction, ultra-high-speed operations.
- Precision Grading: Available in ABEC-1, ABEC-3, ABEC-5, and ABEC-7 tolerance classes.
Technical Specifications
| Inner Diameter | 5mm |
| Outer Diameter | 16mm |
| Width | 5mm |
| Precision Rating | P0 |
| Clearance | C0 |
| Sealing Type | ZZ |
| Number of Row | Single Row |
| Material | Chrome Steel GCR15 |
| Grease RPM Limit | 2000 RPM |
| Lubrication | Grease |
| Size | 5*16*5mm |
| Certificate | ISO9001 |
Key Features
Applications
