The Purpose of the Small Hole in Padlocks

3. Pressure Equalization

In some cases, the hole helps equalize air pressure inside the lock, which can be important for maintaining consistent performance in varying environmental conditions.

Practical Tips:
• If you notice your lock getting harder to use, try applying a small amount of lubricant through this hole.
• Avoid letting dirt or debris block the hole, as this can interfere with its drainage function.
This small design detail reflects thoughtful engineering, ensuring the lock remains reliable and functional even in harsh conditions.