Hydraulic Hose Selection Basics (SAE/EN 853)
A hydraulic hose must carry pressure, fluid and motion safely: nominal size, pressure rating, fitting and bend radius decide service life and safety. The wrong hose bursts under pressure spikes or chafes through at a guide. This guide walks through the key selection criteria to SAE 100R and EN 853 step by step.
View hydraulic hosesHow is a hydraulic hose built and what does the standard say?
A hydraulic hose has an inner tube, a reinforcement and a cover. The inner tube carries the oil, the steel-wire reinforcement takes the pressure, and the cover protects against abrasion and weather. The number and type of reinforcement layers set the pressure rating. Two standard families describe this: EN 853 (European) and SAE 100R (American), which largely correspond.
Which nominal size delivers enough flow without pressure loss?
Nominal size (DN) follows the flow rate and the allowable fluid velocity. Undersized hoses create friction, heat and pressure loss. As a rule of thumb aim for about 5 m/s in pressure lines, 3 m/s in the return and 1 m/s in the suction line. Size for the highest flow rate of the system, not the average.
- Base sizing on flow rate (l/min) and working pressure from the system datasheet.
- For long runs and high viscosity, step up one nominal size.
- Never fit fittings or adapters narrower than the hose nominal size.
- Allow for pressure spikes from valve switching with a factor of 1.3 to 1.5.
How do I check pressure rating, medium and bend radius?
The hose maximum working pressure must exceed the system pressure including spikes; the usual standard is a 4:1 safety factor between burst and working pressure. The fluid must match the inner tube (mineral oil, HFC, biodegradable), and the minimum bend radius must not be undercut during installation, or the reinforcement kinks and service life drops sharply.
Keep working pressure above the system spike, plan a 4:1 factor to burst pressure.
Compare pressure ratingsFrequently asked questions
What do 1SN and 2SN mean on a hydraulic hose?
The codes come from EN 853: SN means a hose with wire braid and a thin cover, the digit gives the number of braid layers. 1SN has one layer for medium pressure, 2SN two layers for high pressure. They correspond to SAE 100R1 and 100R2.
How often should I replace a hydraulic hose?
Many makers state a shelf life and a service life, often around six years in operation. Replace sooner if you see porous covers, blisters, leaks at the fitting or exposed wire. A preventive change is cheaper than a failure under pressure.
Why does my hydraulic hose get hot?
Usually the nominal size is too small, the velocity too high or the oil too viscous. Friction loss turns into heat. Choose a larger nominal size, check the viscosity and avoid tight bends and throttling points.
Find the right hydraulic hose
Our hydraulics specialists help with nominal size, pressure rating, fitting and medium for your system.
Standards-based selection
Recommendations to EN 853 and SAE 100R plus field values.
Correct nominal size
Flow matched to flow rate and velocity.
Safety factor
Working pressure and burst ratio clearly explained.
Expert advice
Hydraulics specialists support your selection.