634
600 Series Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
634
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
5.24 g
Tolerance class
ABEC1
Seal type
Open
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
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
2.381 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
256 lbf
Radial static load rating
94 lbf
Limiting speed
36 X 1000 rpm
Lubrication
Required
Radial internal clearance
0.002mm to 0.013mm
Radial internal clearance
MC3
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.13
/ each
In Stock
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634 Bearing Product Overview & Core Advantages
The 634 metric ball bearing is a single row deep groove ball bearing designed for superior performance in compact applications. Engineered to primarily handle radial loads, this bearing features an open design that facilitates easy relubrication. Manufactured from high-grade chrome steel with a stainless steel cage, it offers excellent durability and reliable operation. Its compact dimensions (4mm bore, 16mm OD, 5mm width) and ABEC1 precision class make it an ideal choice for applications demanding high rotational accuracy and a long service life.
634 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 63 | Series designation, indicating a medium-width, deep groove design. |
| 4 | Bore diameter code. For this series, "4" corresponds to a 4mm bore diameter. |
| Open (No suffix) | The absence of a seal/shield suffix denotes an open bearing, allowing for high-speed operation and custom lubrication schemes. |
634 Bearing Structural Features & Performance Benefits
- Optimized Radial Load Capacity: The deep groove raceway and complement of 7 precision balls enable efficient handling of the specified radial dynamic load rating of 256 lbf.
- High-Speed Capability: The lightweight stainless steel cage ensures stable ball guidance, contributing to a high limiting speed of 36,000 rpm.
- Precision Performance: Manufactured to ABEC1 tolerance class with controlled radial internal clearance (MC3 group), this bearing provides consistent running accuracy and low vibration.
- Robust Construction: Rings and balls made from chrome steel (AISI 52100 equivalent) provide high hardness and wear resistance, ensuring a long operational lifespan under demanding conditions.
634 Bearing Typical Application Areas
This 634 miniature bearing is widely used in applications requiring compact size, high speed, and reliable performance. Key sectors include:
- Small Electric Motors: Ideal for spindle support in miniature DC motors and stepper motors.
- Precision Instruments: Used in optical encoders, gauges, and medical devices.
- Office Automation Equipment: Critical component in printers, scanners, and small fans.
- Robotics and Automation: Suitable for joints, guides, and small drivetrains in compact robotic systems.
