Overview
ISO 6743-7:1986 is Part 7 of the ISO 6743 series and provides the detailed classification for metalworking fluids (Family M) within the class L: lubricants, industrial oils and related products. This part must be read in conjunction with ISO 6743-0 (general principles) and refers to ISO 3448 for viscosity class designations. The standard defines a uniform coding system that helps manufacturers, users and specifiers identify fluid types, compositions and intended applications.
Why it matters: the classification improves communication between suppliers and users, supports specification writing, and guides product selection for metal cutting, forming and other machining operations.
Key Topics
- Classification structure: Family M product categories use a three-letter symbol beginning with "M" (for example, MHA, MHB, MHC). The full designation can include a viscosity class, e.g. ISO-L-MHA 32 or abbreviated L-MHA 32.
- Scope and application: covers metalworking fluids including non-aqueous oils, aqueous emulsions, concentrates, greases and pastes as used for cutting, grinding, forming, stamping, turning, forging and related operations.
- Annexes:
- Annex A - definitions of specific words and expressions used in the classification (e.g., fluid, concentrate, charged fluids, chemically active fluids).
- Annex B - tabular distribution of product categories by fields of application to guide selection for specific machining and forming tasks.
- Annex C - tabular distribution of categories by physical constitution and principal properties (non-aqueous vs aqueous types and their properties).
- Viscosity classes: product designations may be complemented by ISO 3448 viscosity classes to specify fluid consistency.
Applications
ISO 6743-7:1986 is used by:
- Purchasing and specification teams to write clear, standardized requirements for metalworking fluids.
- Engineers and maintenance staff to match fluid categories to machining and forming operations (e.g., cutting, drilling, stamping, forging, cold/hot forming).
- Manufacturers and formulators to label and classify products consistently for international trade and compliance.
Practical benefits include faster selection of appropriate fluid types (non-aqueous oils, emulsions, concentrates or greases), clearer performance expectations, and reduced miscommunication in procurement and quality control.
Related Standards
- ISO 6743-0 - Classification framework and general provisions for class L.
- ISO 3448 - Viscosity classification for industrial lubricants (used to append viscosity numbers to product codes).
This part of ISO 6743 supports harmonized terminology and product coding across the metalworking sector, making it a practical reference for specification, sourcing and application of metalworking lubricants.
Open preview (PDF)Lubricants, industrial oils and related products (class L) — Classification — Part 7: Family M (Metalworking)