Overview
ISO 8434-6:2009 - "Metallic tube connections for fluid power and general use - Part 6: 60° cone connectors with or without O-ring" defines general and dimensional requirements for 60° cone connectors and braze-on nipples made of steel. It covers connectors for tube outside diameters 6 mm through 50 mm and hose sizes 5 through 51, intended for fluid power and general hydraulic applications within the pressure and temperature limits specified in the standard.
Key topics and technical requirements
- Scope & application: Design and performance requirements for 60° cone connectors (with or without O-ring) used to connect tubes or hose fittings to ports (see ISO 6149-1 and ISO 1179-1).
- Materials: Connector bodies and nuts made from carbon steel or stainless steel; weld-on nipples must be suitable for welding.
- Sealing: O-rings - unless otherwise specified - are NBR (nitrile) with hardness (90 ± 5) IRHD, conforming to ISO 3601-3 acceptance criteria.
- Dimensions & threads: Includes dimensional requirements, passage and angular tolerances, contour details and pipe threads per ISO 228-1 for the 60° cone connection ends.
- Performance limits: Connectors are required to meet pressure/temperature performance (e.g., vacuum to specified rated pressures and operation between −40 °C and +120 °C for carbon steel connectors). Refer to the standard’s Table 1 for rated pressures.
- Manufacture & testing: Requirements for construction, workmanship, finish, corrosion protection (e.g., salt spray considerations), assembly torque, marking, and performance/qualification tests (see ISO 19879 for related test methods).
- Procurement & documentation: Designation, procurement information, assembly instructions and marking of components are specified to support interchangeability and quality control.
Applications and who uses it
ISO 8434-6:2009 is applied where reliable, leakproof metal tube connections are required:
- Hydraulic system designers and OEMs specifying connectors for machinery, mobile equipment and industrial systems.
- Connector and hose fitting manufacturers for product design and quality control.
- System integrators and maintenance engineers selecting compatible fittings for repair and replacement.
- Procurement and quality assurance teams ensuring components meet international standards.
Typical keywords: ISO 8434-6:2009, 60° cone connectors, O-ring sealing, metallic tube connections, fluid power, hydraulic connectors, braze-on nipples, NBR O-ring, ISO 228-1.
Related standards
For engineering use, always consult the full ISO 8434-6:2009 text for dimensional tables, rated pressures and detailed test procedures.
Open preview (PDF)Metallic tube connections for fluid power and general use — Part 6: 60 degree cone connectors with or without O-ring