Overview
ISO 6195:2021 specifies the dimensions and tolerances for housings that accept wiper‑rings used on reciprocating cylinder rods in fluid power systems. It covers rod diameters from 4 mm to 450 mm and defines five standardized housing designs (Types A, B, C, D, E) to ensure interchangeability, manufacturability and reliable sealing performance in hydraulic and pneumatic cylinders. The standard focuses on geometric requirements, fits and surface quality; it does not specify wiper materials, performance ratings or detailed seal designs.
Key topics and technical requirements
- Housing types: Defines dimensional profiles for Type A (recessed with undercut or cover), Type B (open recessed with press-fit reinforcement), Type C (recessed undercut for double‑lip wipers), Type D (recessed for elastomer‑energized plastic‑faced wipers) and Type E (alternative to Type A).
- Dimension tables: Detailed tables list radial depths, outside diameters, axial lengths, retainer dimensions and radii for each rod diameter (4–450 mm). These tables are the core reference for design and tooling.
- Tolerances and fits: Tolerances referenced to ISO 286‑2 and specific ISO fits are provided to ensure correct press‑fits, clearances and assembly behavior.
- Surface roughness: Surface finish requirements and recommended roughness parameters (per ISO 4287) are specified because surface texture strongly affects wiper life and contaminant exclusion.
- Symbols, definitions and identification: The standard defines symbols and terms (using ISO 5598 vocabulary) and requires identification statements for housings.
- Manufacturing guidance: Notes on burr removal, chamfers and use of split housings or one‑piece designs for small/large rod diameters help guide production and inspection.
Practical applications and users
ISO 6195:2021 is used by:
- Hydraulic and pneumatic cylinder designers and OEMs - for gland and gland‑housing design to accept standard wiper‑rings.
- Seal and wiper‑ring manufacturers - to specify compatible housings and advise customers on correct wiper types.
- Machining and tooling engineers - to produce housings with proper tolerances, fits and surface finishes.
- Quality, inspection and purchasing teams - to verify part compliance and ensure interchangeability across suppliers.
Practical benefits include improved interchangeability, reduced leakage/contamination risk, simplified procurement and clearer machining/tolerance specifications for production.
Related standards
- ISO 4287 - surface texture/profile method (referenced for roughness parameters)
- ISO 5598 - fluid power vocabulary
- ISO 5597, ISO 6020‑1/2/3, ISO 6022, ISO 10762 - related cylinder and gland standards referenced for compatibility
- ISO 286‑2 - tolerances and fits
Using ISO 6195:2021 helps ensure consistent, standardized cylinder‑rod wiper housing geometries across the fluid power industry, improving seal performance and component interchangeability.