Internal Clearance Analysis of NMB Bearings
Source: Bearing Network | Date: February 13, 2014
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The internal clearance of an NMB ball bearing plays a crucial role in its performance, affecting factors such as vibration, noise, and heat generation. Choosing the correct internal clearance is essential to ensure optimal operation under different application conditions.
Internal clearance can be categorized into three types: radial clearance, axial clearance, and angular clearance.
- **Radial Clearance (Gr)**: This refers to the movement of the outer ring in the radial direction when the inner ring is fixed.
- **Axial Clearance (Gt)**: This is the amount of movement of the outer ring along the axis when the inner ring is held stationary.
- **Angular Clearance (θ)**: This is the tilt movement of the outer ring relative to the axis while the inner ring remains fixed.
For NMB bearings, the axial clearance specifications are defined by different nominal codes:
| Clearance Code | Axial Clearance Range (μm) |
|----------------|----------------------------|
| P13 | 2.5 – 7.5 |
| P24 | 5 – 10 |
| P25 | 5 – 12.5 |
| P58 | 12.5 – 20 |
Similarly, JIS standards also define axial clearance for various codes:
| Clearance Code | Axial Clearance Range (μm) |
|----------------|----------------------------|
| M2 | 3 – 8 |
| M3 | 5 – 10 |
| M4 | 8 – 13 |
| M5 | 13 – 20 |
Understanding these clearance values helps engineers and technicians select the most suitable bearing for specific applications, ensuring smooth operation and extended service life.
**Recommended Reading:**
- How to Remove the Motor Bearing Cap
- Factors That Affect Bearing Life
- Characteristics of Linear Bearings and Proper Use of Bearing Housing
- Important Precautions When Using Bearings
This article was originally published on China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net).
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