W 634 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 634 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0057 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
16 mm
Outside diameter tolerance
-0.008mm to 0
Width
5 mm
Width tolerance
-0.12mm to 0
Outer Ring Dimensions
Flange outer diameter
18 mm
Flange thickness
1 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
171 lbf
Radial static load rating
60 lbf
Limiting speed
50 X 1000 rpm
Lubrication
Grease
Radial internal clearance
CN
Materials
Ring material
Stainless Steel
Ball material
Stainless Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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W 634 R-2Z Bearing Product Overview & Core Advantages
The W 634 R-2Z is a single row deep groove ball bearing designed for high performance in compact spaces. Engineered with stainless steel construction throughout (rings, balls, and cage), it offers excellent corrosion resistance and is suitable for applications requiring cleanliness and durability. Its primary advantage lies in its ability to handle significant radial loads while also accommodating moderate axial loads in both directions. The integral shielded design (2Z) and pre-lubrication ensure long-term, maintenance-free operation, making it a highly reliable choice for precision mechanisms.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Bearing Series |
| 634 | Standard bearing size designation (4mm bore, 16mm OD, 5mm width) |
| R | Bearing with a Flange on the Outer Ring |
| 2Z | Non-contact shields on both sides for contaminant exclusion and grease retention |
W 634 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Flange Design: The outer ring flange (18mm diameter) simplifies bearing mounting and axial location, saving space and reducing assembly costs in housings.
- High Corrosion Resistance: Manufactured entirely from stainless steel, this bearing is ideal for applications exposed to moisture, chemicals, or requiring washdown, ensuring long service life.
- Optimized for Radial Loads: The deep groove raceway and stainless steel cage are engineered to support high radial dynamic load ratings (171 lbf) efficiently.
- Maintenance-Free Operation: The combination of non-contact shields (2Z) and pre-applied grease lubrication seals the bearing against contaminants and retains lubricant, enabling reliable performance without re-lubrication.
- Precision & Smooth Operation: Built to P0 tolerance class and standard CN radial internal clearance, it provides consistent, low-noise, and smooth running for precision applications.
W 634 R-2Z Bearing Typical Application Areas
This bearing is widely used in:
- Small Electric Motors (e.g., drones, miniature fans)
- Precision Instruments and Medical Devices
- Food Processing & Packaging Machinery (due to stainless steel and shield protection)
- Office Automation Equipment (printers, scanners)
- Guidance and Idler Rollers in Conveyor Systems
