In modern industrial and mechanical equipment, hydraulic systems are the core of power transmission, and hydraulic hoses are indispensable key components of the system. The SAE J517 standard is one of the most authoritative standards in the field of hydraulic hoses, providing unified guidelines for the design, manufacturing, performance, and testing of hydraulic hoses, helping equipment maintain long-term stable operation.
What is SAE J517?
The J517 standard, established by SAE (Society of Automotive Engineers), specifically sets detailed requirements for hydraulic hoses and their assemblies (including the hose body, fittings, reinforcement layers, etc.).
The standard covers key performance indicators such as hose types, sizes, working pressure, burst pressure, temperature range, oil resistance, and wear resistance. Whether in industrial hydraulics, construction machinery, or automotive and aerospace applications, SAE J517 serves as a reference standard to ensure the safety and reliability of hydraulic hoses.
SAE J517 Hydraulic Hose Classification
According to the SAE J517 standard, hydraulic hoses can be categorized into the following series based on their structure and reinforcement layers:
| Series | Reinforcement Layer | Applicable Pressure | Main Features | Common Uses |
| 100R1 / 1SN |
Single-layer steel wire braid | Medium Pressure
| Flexible, easy to install, good oil resistance | Construction machinery, agricultural machinery, industrial hydraulic systems |
| 100R2 / 2SN | Double-layer steel wire braid | High Pressure |
Flexible, easy to install, good oil resistance | Construction machinery, hydraulic transmission systems, industrial hydraulics |
| 100R3 / 3SP | Single-layer spiral steel wire braid | High Pressure | High pressure resistance, bend-resistant |
Hydraulic pump and cylinder connections |
| 100R4 / 4SP | Double-layer spiral steel wire braid | High Pressure | High pressure resistance, bend-resistant | Construction machinery, mining equipment |
| 100R5 / 4SH | Four-layer steel wire spiral | Ultra High Pressure |
Extremely high explosion resistance | Construction machinery, heavy hydraulic systems |
| 100R6 / R6 | Single-layer fiber reinforced | Low Pressure | Lightweight, flexible | Industrial low-pressure hydraulics, factory equipment |
| 100R7 / R7 | Double-layer fiber reinforced | Medium Pressure | Lightweight, good oil resistance | Agricultural machinery, light industrial hydraulics |
| 100R8 / R8 | PTFE or thermoplastic material | High Temperature Chemical Resistance | Corrosion-resistant, high temperature resistant | Special chemical hydraulics, aerospace |
Note: The R1, R2, R3, etc., following the series number indicate the hose structure and pressure rating according to the SAE J517 standard. SN stands for single-wire braid, SP stands for spiral wire, and SH stands for four-wire spiral.
Core Indicators of SAE J517 Hydraulic Hoses
Working Pressure: The maximum pressure the hose can withstand for long-term use
Burst Pressure: The pressure at which the hose will rupture under extreme conditions, generally 4 times the working pressure
Temperature Range: The hose maintains stable performance within the specified temperature
Inner Diameter and Outer Diameter: Ensures the hose matches connectors and equipment
Oil Resistance and Abrasion Resistance: Suitable for different hydraulic oils and working environments
Why choose hoses that comply with SAE J517?
Safe and reliable: Strict pressure and burst testing ensures safe use.
Highly versatile: Standardized design fits a variety of equipment and fittings.
Stable performance: Excellent resistance to high pressure, wear, and oil.
Easy to maintain: Can be quickly replaced with conventional hydraulic hoses on the market.
Choosing hydraulic hoses that meet the SAE J517 standard is a reliable way to ensure the long-term stability and safe operation of your hydraulic system.
