ISO 6194-2:2009

Overview

ISO 6194-2:2009 - "Rotary shaft lip-type seals incorporating elastomeric sealing elements - Part 2: Vocabulary" defines the standardized terminology for radial lip-type seals that use elastomeric sealing elements. It applies where the general fluid-power terms in ISO 5598 are used and is intended for seals suitable for low-pressure applications. This second edition (2009) replaces the first edition (1991) and is part of the ISO 6194 series addressing dimensions, handling, testing and visual inspection of rotary lip seals.

Key topics

ISO 6194-2 focuses on consistent, unambiguous terms and definitions relevant to rotary shaft lip-type seals. Major subject areas covered include:

• Types of seals - assembled seals, metal-cased seals, seals with protection lips, hydrodynamically aided profiles, etc. (illustrated in the standard).
• Parts of sealing devices, tolerances and fits - vocabulary used to describe seal components, mating-shaft and housing fits, and associated tolerance language.
• Visual imperfections - standardized terms for surface defects and allowable visual conditions (see figures referenced in the document).
• Storage, handling and installation - terms that clarify safe practices affecting seal performance and service life.
• Performance test procedure - terminology related to test setups and outcome reporting (complements Part 4, which contains actual test methods).

Note: ISO 6194-2 is a vocabulary document - it standardizes language rather than prescribing numerical specifications or test procedures.

Applications and users

This vocabulary standard is practical for professionals who design, produce, specify, test, procure or maintain rotary shaft lip-type seals:

• Seal and component manufacturers - to ensure consistent product descriptions and drawings.
• Mechanical designers and engineers - to write clear specifications and interface requirements for shafts and housings.
• Quality, inspection and test labs - to harmonize reporting terminology for visual defects and performance outcomes.
• Purchasing and procurement teams - to avoid ambiguity in orders and contracts.
• Maintenance and reliability teams - to interpret documentation and fault reports consistently.

Benefits include reduced miscommunication, clearer technical specifications, and better alignment between stakeholders across international supply chains.

Related standards

• ISO 6194 (series) - Parts 1 (dimensions), 3 (storage/installation), 4 (performance tests), 5 (visual imperfections).
• ISO 5598 - General fluid power vocabulary referenced by ISO 6194-2.
• ISO 16589 - Covers seals with thermoplastic sealing elements (complements ISO 6194 which focuses on elastomeric elements).

Keywords: ISO 6194-2, rotary shaft lip-type seals, elastomeric sealing elements, vocabulary, low-pressure seals, ISO 5598, seal terminology, seal installation, performance testing.