Match a 4SH hose to the highest pressure the complete hydraulic circuit can experience, then confirm that the chosen hose size has a working-pressure rating at least that high. Do not use burst pressure as the allowable operating pressure: burst is a failure-limit specification, not a normal working target. In EN 856 4SH, pressure ratings generally vary by nominal bore, so a larger hose is not automatically rated for the same pressure as a smaller one. Check the exact hose and fitting assembly data from your supplier before ordering or installation.
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Working pressure is the maximum pressure specified for normal hose service under the conditions stated by the manufacturer. Compare it with the circuit’s maximum operating pressure, including pressure peaks that can occur during starting, stopping, load changes, or valve operation. If the system has known surges, use measured or reliably specified peak pressure rather than relying only on the nominal pump setting. The hose’s pressure rating must remain suitable at the applicable temperature and in the intended application.
Burst pressure describes a destructive test limit; it does not mean the hose can safely operate near that pressure. EN 856 4SH hose is commonly specified with a 4:1 burst-to-working-pressure relationship, meaning the stated minimum burst pressure is four times the working-pressure rating. For example, a hose rated at 420 bar working pressure corresponds to 1,680 bar at a 4:1 burst ratio. This relationship is a safety design criterion, not permission to run the system above 420 bar.
Read the hose marking or supplier datasheet to confirm the EN 856 4SH type and nominal size. The dash size refers to the hose’s nominal inside diameter in sixteenths of an inch, while DN is the metric nominal bore designation. Use the manufacturer’s table for the exact product, because ratings can differ among product constructions and suppliers. Do not infer a rating from appearance or from another hose family.
| Nominal size | Common dash size | Indicative working pressure | Indicative burst pressure at 4:1 |
|---|---|---|---|
| DN 10 | -6 | 420 bar | 1,680 bar |
| DN 12 | -8 | 400 bar | 1,600 bar |
| DN 16 | -10 | 350 bar | 1,400 bar |
| DN 19 | -12 | 320 bar | 1,280 bar |
| DN 25 | -16 | 280 bar | 1,120 bar |
| DN 31.5 | -20 | 210 bar | 840 bar |
| DN 38 | -24 | 180 bar | 720 bar |
| DN 51 | -32 | 160 bar | 640 bar |
The figures above are indicative examples of commonly listed EN 856 4SH ratings, not a substitute for a product-specific datasheet. The burst figures are calculated from the 4:1 relationship and should not be treated as operating pressures. Confirm the rating, size designation, temperature range, and applicable standard edition with the supplier before specifying a hose.
Write down the system’s maximum pressure and compare it with the hose working-pressure rating for the selected bore. The hose rating must equal or exceed the highest pressure expected in service; a margin should not be created by treating burst pressure as extra capacity. If pressure spikes are possible but not documented, ask the equipment designer or measure the circuit with suitable instrumentation. A change to a higher-pressure hose does not correct an unsuitable pump, valve, or pressure-control setting.
A hose bore must also carry the required flow without creating unacceptable pressure loss, heat, or fluid velocity. Choosing a smaller bore solely because its listed working-pressure rating is higher may compromise hydraulic performance. Conversely, choosing a larger bore for flow can mean selecting a size with a lower pressure rating. Use the equipment manufacturer’s flow and pressure requirements, then verify that one suitable 4SH size meets both.
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A hose assembly is only as suitable as its components and construction. Confirm that the hose, inserts, sockets, and connection type are specified as a compatible assembly for the required working pressure and service conditions. Follow the assembly supplier’s instructions for crimp dimensions and inspection, rather than combining components based only on nominal size. Check that connection threads and sealing faces also match the equipment ports.
Pressure capacity must be considered together with operating temperature, hydraulic-fluid compatibility, and the hose’s installation conditions. A datasheet may state limits or derating guidance that affect the usable rating, so ask the supplier to confirm the rating for the actual service environment. Check minimum bend radius and avoid twisting, crushing, abrasion, or tension during installation. A hose that meets the pressure figure on paper may still be unsuitable if it is routed or used outside its stated limits.
Repeated pressure cycling can be more demanding than steady operation, so identify whether the application involves frequent starts, pulsation, impact loading, or continuous high-pressure duty. Use the hose manufacturer’s stated impulse or application guidance where available; do not assume a burst rating predicts service life. When duty details are uncertain, provide the supplier with pressure, cycle, temperature, and operating-time information for a more informed recommendation. This is especially important when replacing an existing hose with a different bore or construction.
Before requesting a quotation, prepare a short specification covering the EN 856 4SH requirement, nominal bore or flow rate, maximum working pressure, and any known pressure peaks. Include fluid type, operating temperature, hose length, end connections, bend or routing constraints, and expected duty cycle. If you are replacing an existing hose, provide readable photos of the hose markings and fittings, but verify dimensions rather than relying on photos alone. This information helps a supplier assess both pressure suitability and practical fit.
Ask for the product-specific working-pressure rating and applicable burst specification for the exact size, along with temperature and compatibility guidance. Confirm the recommended fittings and whether the quoted item is hose-only or a finished assembly. For purchasing planning, also request available sizes, minimum order quantity, production or shipping lead time, and any inspection or documentation options relevant to your order. These details should be confirmed in the quotation because availability and terms can vary by product and destination.
To match 4SH hose size to working and burst pressure, first choose a bore that meets the circuit’s flow needs, then verify that the exact hose size’s working-pressure rating covers the highest expected system pressure. Treat burst pressure only as a safety-related failure limit; at a 4:1 relationship, a 420 bar working rating corresponds to 1,680 bar burst, not 1,680 bar operating capacity. Finally, confirm temperature, fluid, pressure cycling, routing, and compatible fittings against product-specific supplier information.
XINCHI supports B2B buyers sourcing rubber products by reviewing application details and helping identify the information needed to specify EN 856 4SH hose. Send your required size, working pressure, flow or equipment details, fluid, temperature, and fitting requirements for a product-specific discussion. Confirm the final hose and assembly ratings against the applicable datasheet before purchase and installation.
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