What Does ISO 6743 Mean? | Lubripedia

ISO 6743 is an international standard published by the International Organisation for Standardisation (ISO).
It defines a classification system for lubricants, industrial oils, and related products, grouping them according to their intended application and performance characteristics.

This standard provides a common language for lubricant manufacturers, equipment builders, and maintenance professionals worldwide.

What Is ISO 6743?

ISO 6743 establishes a comprehensive framework for identifying and naming lubricants based on their function.
The system is divided into multiple parts (ISO 6743-1, ISO 6743-2, etc.), each covering specific types of lubricants or applications.

For example:

Each category is further divided into letters and numbers that describe the lubricant’s use and properties.
For instance, ISO-L-HM refers to a high-quality anti-wear hydraulic oil.

Why Is ISO 6743 Important?

The ISO 6743 classification:

• Simplifies communication between lubricant suppliers and end users.
• Ensures compatibility between lubricants and equipment.
• Supports maintenance and reliability programmes by standardising lubricant identification.
• Reduces misapplication risk, ensuring the correct oil is used for the correct function.

By using ISO 6743 classifications, industries can easily cross-reference equivalent products from different brands.

Typical Applications:

ISO 6743 classifications are used across:

• Industrial manufacturing
• Power generation
• Automotive and transport sectors
• Mining and heavy machinery
• Marine and aviation lubrication systems