Hydraulic hose
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Frequently asked questions
What do hose codes like 2SN, R2AT and 4SH mean?
They are construction grades under EN 853, EN 856 or SAE J517. 1SN and R1AT have one steel wire braid; 2SN and R2AT have two braids and carry higher pressure at the same size. 4SP and 4SH have four spiral wire layers for high pressure and heavy impulse.
How do I read hose sizes marked -08 or DN12?
The dash number (-08) gives inside diameter in sixteenths of an inch, so -08 is 8/16, or 1/2 inch. DN12 is a nominal inside diameter of about 12.7 mm, the same size as -08. Hose is selected by inside diameter because that determines flow and fluid velocity.
How does working pressure change with hose size?
Within one construction grade, larger hose has a lower rated working pressure. For example, small 2SN hose is rated much higher than large 2SN hose. Look up the rating for the exact size rather than using one figure for the whole grade.
How should hydraulic hose be installed to avoid early failure?
Do not twist the hose when tightening fittings, keep the bend radius at or above the minimum, and leave enough straight length behind the crimped fitting. Hose length changes under pressure, so allow slight slack. Prevent rubbing against sharp edges or other hoses, using protective sleeves where needed.
Can one maker's fittings be crimped onto another maker's hose?
This is not advisable, because cover thickness and braid dimensions differ between makers, and pressure ratings are only confirmed for the tested combination of hose, fitting and crimp specification. Mixing can let the fitting blow off under pressure. Use hose and fittings from the same system.
How often should hydraulic hose be replaced even if not failed?
Many makers and standards recommend periodic inspection with condition based replacement, with service life limits usually a few years depending on duty. Signs requiring immediate replacement include a cracked cover, exposed wire reinforcement, blistering, leaks at the crimp or a fitting that has moved. The production date printed on the hose helps track its age.
What safety measures apply to high pressure hose?
Hoses near operators should have burst sleeves or whip restraints to limit harm if a hose fails. Never feel for leaks by hand, use a piece of cardboard, because a high pressure oil jet can inject into skin and cause serious injury. The hose must be fully depressurised before a fitting is loosened.
What is needed to order a crimped hose assembly?
Please provide the hose standard, hose size, overall length measured end to end, the fitting type at each end and the orientation angle between bent ends if any. Also state the working pressure, temperature and fluid type. Sending the old hose as a sample is the quickest way to avoid thread and angle errors.
