Overview
SIST EN 857:2026 specifies the requirements and performance characteristics for two types of wire braid reinforced compact rubber hoses and hose assemblies-types 1SC and 2SC-used in hydraulic applications. The standard covers hoses with nominal bores ranging from 6 mm to 76 mm. These hoses are engineered for conveying hydraulic fluids (as per ISO 6743-4, excluding HFD flame retardant fluids), water-based fluids, and water within defined temperature ranges. The standard ensures high reliability and safety in fluid transfer systems, particularly in hydraulics, by focusing on hose integrity, durability, and compatibility with common hydraulic fluids.
Key Topics
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Types of Hoses:
- Type 1SC: Single wire braid reinforced, compact design.
- Type 2SC: Dual wire braid reinforced, enhanced pressure capabilities.
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Temperature Compatibility:
- Hydraulic fluids (excluding HFD) from −40 °C to +100 °C.
- Water-based fluids from −40 °C to +70 °C.
- Water from 0 °C to +70 °C.
- Not suitable for castor oil or phosphoric ester-based fluids.
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Hose Construction:
- Oil and water-resistant synthetic rubber lining.
- One or two steel wire braids (depending on type).
- Durable synthetic rubber cover for weather and abrasion resistance.
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Dimensions and Tolerances:
- Comprehensive requirements for inside/outside diameter, concentricity, and wall thickness.
- Defined tolerances ensure consistency in hydraulic systems.
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Performance Criteria:
- Hydrostatic, burst, and proof pressure requirements.
- Minimum bend radius for flexibility without kinking.
- Resistance to abrasion, ozone, vacuum, and various fluids.
- No end fitting requirements included; focus is solely on hose and assembly performance.
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Marking and Identification:
- Details for manufacturer, hose type, bore, working pressure, and production date.
- Clear marking aids in traceability and compliance verification.
Applications
Wire braid reinforced compact hoses specified by SIST EN 857:2026 are critical in a wide range of hydraulic applications where space and weight savings, flexibility, and robust pressure performance are required:
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Industrial and Mobile Hydraulics:
Used in hydraulic power units, presses, injection molding machines, and mobile equipment such as excavators, cranes, and agricultural machinery.
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Hydraulic Transmission Systems:
Suitable for high-pressure hydraulic circuits, lifting equipment, and fluid transfer lines.
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Construction and Agricultural Machinery:
Ideal for tight installations where compact hose dimensions are beneficial.
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Maintenance and Replacement:
Standardized requirements simplify sourcing and replacement in repair, retrofit, or new installation contexts.
The standard is not applicable for hoses intended for underground mining or for use with HFD fluids or special chemical fluids where other specifications apply.
Related Standards
To ensure comprehensive compliance and safe use, SIST EN 857:2026 is closely related to several international and European standards:
- ISO 6743-4: Hydraulic fluid classifications.
- EN ISO 1402: Hydrostatic testing for hoses and assemblies.
- EN ISO 4671: Methods of measuring hose dimensions.
- EN ISO 6803: Hydraulic-pressure impulse testing.
- EN ISO 7233: Vacuum resistance determination.
- EN ISO 7326: Ozone resistance under static conditions.
- EN ISO 8033: Adhesion between hose components.
- ISO 1817: Effect of liquids on vulcanized or thermoplastic rubber.
- ISO/TS 20444: Abrasion resistance of hose covers.
These references support manufacturers, engineers, and quality assurance teams in establishing reliable, efficient, and safe hydraulic systems using wire braid reinforced compact hoses standardized under SIST EN 857:2026.