Hoses and Fittings: Temperature Range -40°C to +120°C

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 18752, ISO 12151, SAE J517, DIN 20023, EN 856

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.

View Product Details

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Hoses and Fittings

Manufacturer profiles associated with Hoses and Fittings.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

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Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Hoses and Fittings