ISO 4671:2022

Overview

ISO 4671:2022 - "Rubber and plastics hoses and hose assemblies - Methods of measurement of the dimensions of hoses and the lengths of hose assemblies" - defines standardized, repeatable methods for measuring hose geometry and assembly lengths. It covers measurement of inside diameter (ID), outside diameter (OD) (including diameter over reinforcement for hydraulic hoses), wall thickness, concentricity, lining and cover thickness, methods for length measurement and identification of measurement points, and a method for verifying the through-bore of hydraulic hose assemblies. The standard also specifies test-piece conditioning and the measurement temperature to ensure consistency.

Key Topics and Requirements

• Test-piece conditioning and temperature
  • Test pieces shall be taken at least 16 h after manufacture and conditioned at 23 °C for at least 3 h (the 3 h included in the 16 h); measurement temperature is 23 °C.
• Inside diameter (Clause 5)
  • Methods 1–7 cover a range of diameters and accuracy needs (plug/tapered gauges, expanding balls/telescopic gauges, internal jaws of calipers, internal calliper dial gauges, graduated rulers or digital devices, optical magnifiers, pi-tapes).
  • Minimum test-piece length: 150 mm; for wire‑reinforced hydraulic hoses, measure at least 25 mm from the hose end.
  • Where applicable, take two measurements at right angles and use the average.
• Outside diameter (Clause 6)
  • Multiple measurement methods are specified for different sizes and accuracy levels; the 2022 edition clarifies the OD measurement position.
• Diameter over reinforcement (hydraulic hoses, Clause 7)
  • Specific method to account for reinforcement layers when measuring OD.
• Wall thickness, concentricity, lining and cover thickness (Clauses 8–10)
  • Several methods are provided to suit material, construction and required precision.
• Length measurement and identification points (Clause 11)
  • Defines how to measure hose and hose assembly lengths and where measurement points are located.
• Through-bore verification (Clause 12)
  • Method to confirm unobstructed bore in hydraulic hose assemblies.
• Reporting
  • Clause 13 lists required information for test reports to support traceability and acceptance.

Applications and Who Uses ISO 4671:2022

• Hose manufacturers - to ensure production tolerances and inspection procedures.
• Quality control and testing laboratories - for consistent, comparable measurement results.
• OEMs and specifiers - to define acceptance criteria in procurement and technical specifications.
• Maintenance and field service teams - to verify replacement hoses and assemblies meet dimensional requirements.
• R&D and product development - to validate prototypes and design changes.

Related Standards

• ISO 3611 - Micrometers for external measurements
• ISO 8330 - Vocabulary for rubber and plastics hoses and hose assemblies
• ISO 13385-1 - Design and metrological characteristics of calipers
• ISO 463 - (referenced for internal calliper dial gauges)

Keywords: ISO 4671:2022, rubber and plastics hoses, hose assemblies, measurement methods, inside diameter, outside diameter, wall thickness, concentricity, lining thickness, through-bore verification, hose length measurement.