Overview
ISO 10763:2020 - Hydraulic fluid power - Plain-end, seamless and welded precision steel tubes - Dimensions and nominal working pressures defines sizes and safe working pressures for precision steel tubes used in hydraulic fluid power systems. The standard references tube outside diameters from ISO 4397 and wall thicknesses/mechanical properties from ISO 3305, and it applies a conservative design factor (4:1) to calculated burst pressures to derive nominal working pressures.
Keywords: ISO 10763:2020, hydraulic fluid power, precision steel tubes, nominal working pressure, tube dimensions
Key topics and requirements
- Scope: Specifies nominal outside diameters, wall thicknesses and working pressures for plain-end seamless and welded precision steel tubes intended for hydraulic applications.
- Material and mechanical grade: Tubes are required to meet mechanical properties of grade R37 in normalized condition (NBK) as per ISO 3305. Nominal working pressures in the standard are based on a minimum tensile strength of 360 MPa.
- Pressure derivation: Nominal working pressures are derived from calculated burst pressures using tube geometry and material tensile strength (the calculation uses the natural logarithm of D/(D − 2t)), then applying a design factor of 4 so that Pw = Pb / 4.
- Tabulated values: Table 1 in the standard lists nominal working pressures (MPa and bar) for a matrix of outside diameters and wall thicknesses, enabling direct selection for common tube sizes.
- Identification: The document recommends an identification statement for manufacturers to include in test reports and sales literature when conforming to ISO 10763.
Applications and users
Practical applications:
- Hydraulic power transmission lines in mobile and industrial machinery
- Rigid conduits between hydraulic components, fittings and connectors
- Design and specification of tubing for high-pressure fluid circuits
Who uses this standard:
- Tube manufacturers and suppliers (product specification and test reporting)
- Hydraulic system designers and OEMs (component selection and safety margins)
- Purchasing and QA personnel (ensuring conformity to specified pressures and dimensions)
- Test laboratories and certification bodies (verification of mechanical properties and pressure ratings)
Related standards
- ISO 3305 - Plain end welded precision steel tubes - Technical conditions for delivery
- ISO 4397 - Nominal outside diameters of tubes and nominal hose sizes
- ISO 5598 - Fluid power systems and components - Vocabulary
ISO 10763:2020 is essential when selecting precision steel tubes for hydraulic systems where accurate tube dimensions and conservative, standardized working pressures are required to ensure safe, interoperable fluid-power installations.