ISO 11237:2025

Overview

ISO 11237:2025 - Rubber hoses and hose assemblies - Compact wire-braid-reinforced hydraulic types for oil‑based or water‑based fluids - Specification defines construction, dimensional limits and performance requirements for compact, wire‑braid‑reinforced hydraulic hoses and hose assemblies. The standard covers five hose types in nominal sizes 5 to 76 and is applicable for:

• Oil‑based hydraulic fluids (HH, HL, HM, HR, HV per ISO 6743‑4) at −40 °C to +100 °C
• Water‑based fluids (HFC, HFAE, HFAS, HFB per ISO 6743‑4) and water at 0 °C to +70 °C

ISO 11237:2025 addresses hoses and hose assemblies only - end fittings are not specified - and notes that assembly maximum working pressure is governed by the lowest rated component. Users must verify fluid compatibility with the hose in consultation with manufacturers.

Key technical topics and requirements

• Hose classification: five types (Type 1SC, 2SC, R16S, R17, R19) distinguished by braid layers, working pressure and minimum bend radius. Types R17 and R19 are constant‑pressure designs (21 MPa and 28 MPa respectively).
• Materials and construction: rubber lining resistant to hydraulic fluids, one or two layers of high‑tensile steel wire braid, and a weather/oil‑resistant rubber cover.
• Dimensions and tolerances: inside/outside diameters, concentricity limits and cover thickness (0.8 mm to 1.5 mm) are specified and measured per ISO 4671.
• Performance tests (type and routine): change in length at maximum working pressure (limit +2% to −4%), hydrostatic testing, impulse resistance, minimum bend radius, low temperature flexibility, vacuum resistance (not required for R16S/R17/R19), adhesion between components, ozone resistance, fluid immersion/resistance tests and visual examination.
• Marking, supplied lengths and test frequency: requirements and tolerances are covered, with annexes detailing test frequencies and length tolerances.

Practical applications and who uses this standard

ISO 11237:2025 is intended for:

• Hydraulic hose manufacturers and assembly fabricators for product design, type testing and quality control
• OEMs and system designers specifying hoses for mobile and industrial hydraulic systems
• Maintenance, procurement and quality assurance teams verifying conformance, selection and safe replacement of hoses
• Test laboratories performing hydrostatic, impulse and fluid‑resistance testing

Typical applications include hydraulic lines in mobile machinery, industrial equipment and other systems using oil‑ or water‑based hydraulic fluids where compact wire‑braid hoses are required.

Related standards

Normative and related references include ISO 1402, ISO 1817, ISO 4671, ISO 6605, ISO 6803, ISO 7233, ISO 7326, ISO 8033, ISO 8330 and ISO 10619 (flexibility/stiffness). These are useful when implementing testing, dimensional measurement and fluid compatibility assessments.

Keywords: ISO 11237:2025, rubber hoses, hydraulic hoses, wire‑braid‑reinforced, hose assemblies, oil‑based fluids, water‑based fluids, hose testing, maximum working pressure.