ISO 1179-2:2022

Overview

ISO 1179-2:2022 specifies dimensions, performance requirements and test procedures for stud ends with ISO 228-1 threads using elastomeric (type E) sealing. It covers two series: heavy‑duty (S series) and light‑duty (L series) stud ends for general use and fluid power. The standard defines geometry, materials for elastomeric seals, allowable working pressures, and mandatorily referenced test methods to verify safety and durability.

Key Topics

• Thread and port interface: Stud ends conform to ISO 228-1 thread form and dimensional requirements (hex tolerances to h12).
• Series and pressure ratings:
  • S series (heavy‑duty): usable up to 63 MPa (630 bar) depending on size and materials.
  • L series (light‑duty): usable up to 25 MPa (250 bar) depending on conditions.
• Elastomeric seal material: Seals specified as NBR (nitrile) with hardness (90 ± 5) IRHD (ISO 48‑2) for petroleum‑based hydraulic fluids; manufacturer consultation required for other fluids/temperatures.
• Performance testing: Burst and cyclic endurance tests must meet the pressures listed in Table 3 and be conducted in accordance with ISO 19879. Test sampling: three samples for burst tests and six for cyclic endurance.
• Assembly and torque: Qualification test torques are provided for stud sizes (see standard); actual assembly torque depends on lubrication, coating and finish.
• Safety note: The standard includes an interchangeability warning - mixing stud ends from ISO 1179 series with ports specified to other ISO series (for example ISO 6149) can create hazardous situations.

Applications

• Design and manufacture of hydraulic and pneumatic connectors, fittings and hose assemblies that use ISO 228‑1 threaded stud ends with elastomeric seals.
• Component qualification and quality control testing - ensuring burst, impulse and endurance performance for connectors used in high‑pressure systems (e.g., mobile hydraulics, industrial hydraulics, accumulators).
• Procurement specifications and engineering drawings where defined interchangeability and pressure ratings are required.
• Useful for OEMs, connector manufacturers, test laboratories and maintenance engineers who need to verify compliance or select appropriate sealing materials for operating fluids and temperatures.

Related standards

• ISO 228-1 (thread dimensions)
• ISO 19879 (test methods for hydraulic connections)
• ISO 8434-1 / ISO 8434-2 / ISO 8434-6 (connectors to which ISO 1179-2 is applicable)
• ISO 9974-2 (similar stud ends with elastomeric seals)
• ISO 6149, ISO 16030 (recommendations for new hydraulic/pneumatic designs)
• ISO 48-2, ISO 286-1/2, ISO 5598 (materials, tolerances, terminology)

Keywords: ISO 1179-2:2022, stud ends, ISO 228-1 threads, elastomeric sealing, type E, S series, L series, hydraulic connectors, NBR seal, burst test, ISO 19879.