INDUSTRY COMPONENT

Hoses and Fittings

Hydraulic hoses and fittings are flexible conduits and connectors that transmit hydraulic fluid under pressure within hydraulic systems.

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Component Specifications

Definition
Hydraulic hoses and fittings are critical components in hydraulic systems that enable the transfer of pressurized hydraulic fluid between various system elements such as pumps, valves, cylinders, and actuators. Hoses provide flexibility to accommodate movement and vibration, while fittings ensure leak-proof connections at interface points. These components must withstand high pressures, temperature variations, and environmental conditions while maintaining system integrity and efficiency.
Working Principle
Hydraulic hoses operate by containing and directing pressurized hydraulic fluid through a multi-layer construction: an inner tube resistant to fluid degradation, reinforcement layers (typically steel wire braid or spiral) for pressure containment, and an outer cover for environmental protection. Fittings create sealed connections through mechanical compression, flaring, or threading that prevents fluid leakage while maintaining structural integrity under dynamic pressure conditions.
Materials
Inner tube: Synthetic rubber (NBR, HNBR, EPDM, FKM), thermoplastic (PA, PTFE). Reinforcement: High-tensile steel wire (braided or spiral), textile fiber. Outer cover: Synthetic rubber, polyurethane, thermoplastic. Fittings: Carbon steel (SAE 1018/1020), stainless steel (304/316), brass, aluminum. Seals: NBR, FKM, EPDM O-rings.
Technical Parameters
  • Bend Radius Minimum 5x hose diameter
  • Compatibility Mineral oil, HFA/HFB fluids, water glycol, phosphate esters
  • Burst Pressure 4x working pressure minimum
  • Inner Diameter 3mm to 50mm
  • Pressure Rating 1000-6000 psi (70-420 bar)
  • Temperature Range -40°C to +120°C
Standards
ISO 18752, ISO 12151, SAE J517, DIN 20023, EN 856

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hoses and Fittings.

hydraulic hose hydraulic fittings high-pressure hose hydraulic connectors industrial hose SAE J517 ISO 18752 hydraulic system components Hoses and Fittings Hoses and Fittings in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Hydraulic Hoist System

A hydraulic-powered system that raises and lowers the dump body of a dump truck to facilitate material unloading.

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Engineering Analysis

Risks & Mitigation
  • High-pressure fluid injection injuries
  • System failure due to hose rupture
  • Environmental contamination from leaks
  • Fire hazard with flammable fluids
  • Equipment damage from improper installation
FMEA Triads
Trigger: Abrasion against machine surfaces
Failure: Outer cover wear exposing reinforcement
Mitigation: Proper routing with protective sleeves, adequate clearance, regular inspection
Trigger: Pressure spikes exceeding rated capacity
Failure: Hose burst or fitting separation
Mitigation: Install pressure relief valves, use hoses with 4:1 safety factor, avoid sharp bends
Trigger: Chemical incompatibility with hydraulic fluid
Failure: Inner tube degradation and particle contamination
Mitigation: Verify fluid compatibility, use appropriate hose materials (NBR for petroleum, EPDM for water-based fluids)

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5mm on inner diameter, ±1° on fitting angles, leak-free at 1.5x working pressure
Test Method
Pressure cycling test (ISO 6803), impulse test (SAE J343), burst test (ISO 1402), compatibility testing per fluid specifications

Buyer Feedback

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Frequently Asked Questions

What is the difference between SAE and metric hydraulic fittings?

SAE fittings follow inch-based measurements and thread standards (SAE J514), while metric fittings use millimeter measurements (ISO 8434). They are generally not interchangeable without adapters.

How often should hydraulic hoses be replaced?

Hydraulic hoses should be replaced every 5-7 years or according to manufacturer recommendations, but more frequently if visual inspection reveals cracks, abrasions, bulges, or leaks.

What causes hydraulic hose failure?

Common causes include excessive pressure spikes, improper routing causing abrasion, temperature extremes, chemical incompatibility, improper installation, and age-related degradation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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