ISO 6743-13:2002

Overview

ISO 6743-13:2002 specifies the detailed classification for Family G (Slideways) lubricants within class L (Lubricants, industrial oils and related products). It defines product categories, coding conventions and viscosity designation conventions (referencing ISO 3448). This part is intended to be read in conjunction with ISO 6743-99 (General) and provides a uniform system for designating slideway lubricants used on machine-tool slideways, nut-screw systems, plain bearings and similar sliding contacts.

Key Topics

• Scope and purpose: Establishes the detailed classification of lubricants intended specifically for slideways and related sliding mechanisms.
• Coding and designation: Products are designated by a symbol beginning with the letter G followed by one or more letters (e.g., GA, GB, GS). A viscosity grade from ISO 3448 may be appended (for example, ISO-L-GA 150 or abbreviated L-GA 150).
• Product categories: The standard defines categories with typical applications and performance expectations:
  • GA: Refined mineral oils for metallic sliding surfaces where anti-wear, corrosion protection, tackiness and anti-stick-slip properties are essential. GA type oils may be substituted by HG type oils of the same viscosity grade if anti-stick-slip properties are met.
  • GB: Refined mineral oils intended for slideways with non-metallic sliding materials (pigmented polymers, resins, etc.) and where compatibility with aqueous cutting fluids or sensitivity to lubricant contamination is a factor.
  • GS: Synthetic slideway lubricants formulated for improved performance and compatibility with aqueous coolants; used where contamination of coolants and emulsification or solubilization of the slideway lubricant is required.
• Symbols and notes: The first letter (G) identifies the family; subsequent letters form the specific category code. The second letter alone has no standalone meaning outside the combined code.

Applications

Typical applications covered by the classification include:

• Machine-tool slideways and ways
• Nut-screw and ball-screw systems
• Plain and journal bearings used in slideway systems
• Environments where anti-stick-slip, friction reduction, tackiness and corrosion protection are required

Practical guidance: use the code and appended ISO 3448 viscosity grade to select products that meet both the mechanical requirements (stick-slip control, wear protection) and material compatibility (metallic vs non-metallic slide surfaces, presence of aqueous coolants).

Related Standards

• ISO 6743-99 - Lubricants classification: General (read in conjunction with part 13)
• ISO 3448 - Industrial liquid lubricants: ISO viscosity classification (used for viscosity grade designation)
• Other parts of ISO 6743 (e.g., Part 4 HG reference) provide cross-references for substitution and broader lubricant family guidance.

Keywords: ISO 6743-13:2002, Family G, slideways lubricants, anti-stick-slip, ISO 3448, viscosity grade, machine-tool slideways, lubricant classification.