Development of ISO Standards Continues

The U.S. Technical Advisory Groups (TAGs) for contamination control (TC 131/SC 6) and connectors (TC 131/SC 4) met recently to continue the ISO standardization work in fluid power systems. More than 30 connector and filter test engineering experts attended in-person or virtually. Both NFPA and non-NFPA members, representing many fluid power-related companies, were in attendance, including Holmbury, Donaldson, Pall, Parker, Cummins, Eaton, Danfoss, Caterpillar, Mann+Hummel, and John Deere.

There are 88 published ISO standards and 17 projects in various stages of development under the direct responsibility of the contamination control and connector subcommittees. In the international arena, the U.S. TAG develops and advocates for the U.S. position in each of these standards. Here is a sample of the projects currently under development:

  • TR 6049, Hydraulic fluid power —Procedures used to NIST certify the standard reference material SRM 2806x a calibrant for liquid automatic particle counters
  • ISO/FDIS 23369, Filter multi-pass test under cyclic flow conditions
  • ISO/DIS 12829, Hydraulic spin-on filters with finite lives — Method for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelope.
  • ISO/FDIS 1179-2:2013 [Connections for general use and fluid power — Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing — Part 2: Heavy-duty (S series) and light-duty (L series) stud ends with elastomeric sealing (type E)
  • TS/AWI 11686 – Connectors for fluid power and general use — Assembly instructions for connectors with adjustable stud ends and O-ring sealing.
  • ISO 17165‑1 (hydraulic hose lengths and requirements) – reference document 131/4/6 N 458 (U.K. experts’ matrix of hose assembly length tolerances in ISO 17165‑1).

The next U.S. TAG to TC 131/SC 6 and TC 131/SC 4 meetings will be held in a hybrid format in the March/April timeframe. Other U.S. TAGs continue to meet virtually as needed. NFPA is looking for engineers interested in participating in standards development activities as experts in ISO/TC 131 and/or the U.S. TAG to TC 131.

If you are interested in attending and/or participating in standards development, please contact Denise Husenica at

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