ISO 8434-2:2007

Overview

ISO 8434-2:2007 - Metallic tube connections for fluid power and general use - Part 2: 37° flared connectors - specifies the design, dimensional requirements and performance tests for 37° flared connectors used with metallic tubing. The standard covers connectors suitable for ferrous and non‑ferrous tubes with outside diameters from 6 mm to 50.8 mm and is intended for fluid power and general applications where metal‑to‑metal sealing and full‑flow connections are required.

Key SEO phrases: ISO 8434-2:2007, 37° flared connectors, metallic tube connections, hydraulic connectors, fluid power fittings.

Key topics and technical requirements

• Scope and use: Connectors for tubes (6 mm to 50.8 mm OD) for hydraulic/fluid power and general use, within specified pressure and temperature limits.
• Materials: Bodies from carbon steel, stainless steel or copper alloys; nuts and sleeves selected to match body materials to meet pressure/temperature ratings.
• Threading and compatibility: Uses unified inch threads (per ISO 263) for the 37° flare - retained to maintain compatibility with legacy systems. Connectors mate with ports defined in ISO 6149‑1, ISO 1179‑1, ISO 9974‑1 and ISO 11926‑1.
• Sealing and flow: Metal‑to‑metal sealing for full‑flow performance in hydraulic systems.
• Pressure/temperature guidance: Specifies working pressure/temperature limits and material derating (e.g., stainless steel derating: 4% at +50 °C; 11% at +100 °C; 20% at +200 °C). For conditions outside specified limits, manufacturer consultation is required.
• Testing and qualification: Includes a performance and qualification test regime (Clause 15) to validate connector pressure performance and leak integrity.
• Designation, manufacture and marking: Alphanumeric ordering codes, material/manufacture requirements, assembly instructions and marking requirements to support procurement and traceability.

Applications and who uses this standard

ISO 8434-2:2007 is used by:

• Hydraulic system designers and OEMs specifying robust tube‑to‑port connections.
• Tube and hose assembly manufacturers producing 37° flared fittings.
• Maintenance and reliability engineers replacing fittings in hydraulic equipment.
• Procurement and quality teams ensuring component conformity and traceability. Common applications include mobile hydraulics, industrial hydraulic circuits, fluid power machinery and general pressurized fluid conveyance where metal‑to‑metal sealing and high flow are required.

Related standards

• ISO 8434 series (Part 1, Part 3, Part 4, Part 6)
• ISO 6149‑1, ISO 1179‑1, ISO 9974‑1, ISO 11926‑1 (port and stud end interfaces)
• ISO 12151‑5 (related hose fittings)
• ANSI/SAE J514 (historical basis)
• ISO 19879, ISO 10763 (test methods / tube wall criteria)

This summary helps engineers and procurement teams quickly assess whether ISO 8434-2:2007 37° flared connectors meet their hydraulic and general‑use tubing connection requirements.