Overview
ISO 13486-1:1999 defines essential dimensional and physical characteristics for components used in hydraulic braking systems for road vehicles. Specifically, it covers double-flare pipes, tapped holes, male fittings (Types A and B) and tube seats. The standard targets metallic brake tubing (with or without surface protection) and includes requirements for material properties, corrosion resistance and marking/identification.
Key Topics
- Scope and components: Requirements for double-flare pipes, male fittings (Type A and Type B), tapped holes (AS and BS), and tube seats used in hydraulic braking systems.
- Dimensional specifications: Detailed dimensions and tolerances are provided for common nominal pipe diameters (for example 4.75, 6, 6.35, 8 and 10 mm) and corresponding fittings and seats.
- Material properties: Steel material requirements are included (typical values shown: tensile strength ≈ 290 MPa, yield ≈ 200 MPa, elongation ≈ 25% for bendable pipes).
- Surface condition and corrosion resistance: Inner and outer surfaces must be free from oxidation. Outer surfaces must resist corrosion and pass the ISO 9227 salt spray test for at least 96 hours.
- Fitting and hole types: Definitions and dimensional drawings for Type A and B male fittings and their matching tapped holes (AS, BS), including allowances for surface protection thickness and manufacturing options (forged vs. turned).
- Tube seats: Geometry and surface finish requirements to ensure reliable sealing and mechanical fit for brake line connections.
- Marking and identification: Marking rules for forged and turned fittings (three-dent marking for forgings, step marking for turned parts) and a recommended identification statement for documentation and marketing materials.
Applications
- Automotive OEMs and Tier suppliers designing or manufacturing brake tubing, fittings, and seats to ensure interchangeability and safety.
- Component manufacturers producing double-flare pipes, male fittings and associated tapped holes.
- Quality assurance and testing labs verifying dimensional conformity, material properties and corrosion resistance per ISO 13486-1.
- Aftermarket and repair suppliers specifying replacement brake lines and fittings that meet original-equipment standards.
- Design engineers ensuring brake system interfaces meet standardized sealing and mechanical fit criteria.
Related Standards
- ISO 4038:1996 - simple flare pipes, tapped holes and fittings (related pipe requirements)
- ISO 9227:1990 - salt spray corrosion testing
- ISO 1302, ISO 3996, ISO 6120 - referenced for surface texture and brake hose assembly considerations
- ISO 13486-2 - Part 2: Flare-to-flare connections
Using ISO 13486-1:1999 helps ensure compatibility, safety and corrosion-resistant performance of hydraulic braking pipework and fittings across road-vehicle platforms.