To match an EN 856 4SH hose to a hydraulic system, first confirm the required operating pressure, then select a hose size whose manufacturer-rated working pressure meets or exceeds that requirement. Choose the inside diameter separately to carry the required flow without excessive pressure loss or heat, and verify that the hose, fittings, and assembly all have suitable ratings. Never use burst pressure as an allowable operating pressure: it is a failure-limit test value, not a normal working target.
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As a practical reference, 4SH catalogs commonly show working-pressure ratings of 420 bar for some smaller sizes and lower ratings for larger bores; the exact rating depends on the product. For example, a catalog may list 350 bar working pressure for a 1¼-inch hose and a 1,400 bar burst pressure. Treat such figures as examples only and confirm the current datasheet for the exact hose and assembly you plan to buy.
Working pressure is the maximum continuous pressure specified by the hose manufacturer for the stated product and conditions. Compare this rating with the system’s highest expected operating pressure, including pressure changes during normal machine cycles. If the system routinely approaches the hose rating, ask the equipment designer or hose supplier to assess the duty rather than assuming the nominal rating leaves enough margin.
Pressure ratings apply to the hose assembly only when its components are compatible and correctly assembled. A hose may have an adequate rating while an incorrectly selected fitting, adapter, or crimped connection does not. Check the ratings and assembly requirements for every component in the pressure path.
Burst pressure describes the pressure at which a new hose is expected to fail under a specified test, rather than a pressure at which it should be operated. Many hydraulic hose specifications use a minimum burst-to-working-pressure ratio of 4:1, but the exact requirement and published values must be checked against the applicable standard and product datasheet. A nominal 420 bar working-pressure rating paired with a 1,680 bar burst rating illustrates that ratio; it does not mean the hose can safely operate at 1,680 bar.
Identify the maximum operating pressure at the hose location, not just the pump’s nameplate value. Check the machine documentation and consider pressure changes caused by load, valve operation, and the circuit’s normal operating cycle. If pressure spikes or pulses are possible, obtain reliable system information and include them in the selection review.
Do not compensate for unknown pressure by using burst pressure as a safety factor. If the maximum pressure or transient behavior is unclear, pause the purchase and ask the equipment manufacturer or a qualified hydraulic engineer to confirm the design conditions.
Hose size usually refers to nominal inside diameter, often identified by a dash size. It is not the outside diameter and does not, by itself, tell you the pressure rating. Match the bore to the required flow rate and hose length, using the system designer’s specifications or a suitable hydraulic sizing method.
A bore that is too small can increase fluid velocity and pressure loss, while an unnecessarily large bore may create fitment or routing problems. The correct diameter is therefore a flow and installation decision as well as a pressure-selection step. Do not move to a larger size without checking its published pressure rating: some 4SH product ranges have lower working-pressure ratings in larger diameters.
Once you know the nominal bore, read the manufacturer’s table for that exact 4SH size. Check working pressure, burst pressure, temperature range, minimum bend radius, and any stated limitations. The table below shows representative catalog-style examples, not a substitute for a product-specific specification.
Hengshui Xinchi Hose Manufacturing Co., Ltd. Product Page
| Nominal hose size | Illustrative working pressure | Illustrative burst pressure | Selection check |
|---|---|---|---|
| ½ inch | 420 bar | 1,680 bar | Confirm the exact model and assembly rating. |
| 1 inch | 420 bar | 1,680 bar | Check the manufacturer’s current size-specific data. |
| 1¼ inch | 350 bar | 1,400 bar | Do not assume its rating matches smaller bores. |
Ratings can differ between manufacturers and product versions, so these figures are for orientation only. Confirm that the datasheet identifies EN 856 4SH and the required size, and check whether the stated rating applies under your operating conditions. If your required working pressure exceeds the rating for the selected bore, do not use the burst value to justify the choice.
Select fittings and adapters specified for the hose series and pressure requirement, and have the assembly made using the supplier’s instructions and compatible equipment. Check that the finished assembly does not twist, kink, rub against sharp edges, or bend tighter than its specified minimum bend radius. Routing and fitting selection can affect service life even when the pressure rating appears suitable.
Review fluid compatibility and temperature as well as pressure. The hose’s rated performance may depend on the fluid, ambient conditions, and temperature range stated by its manufacturer. Where the application is hot, chemically demanding, highly impulsive, or otherwise outside ordinary service, request product-specific guidance instead of applying a generic rating.
Another avoidable error is treating a standard designation as a complete purchasing specification. “EN 856 4SH” does not tell a supplier the required length, end connections, quantity, fluid, or installation conditions. Providing these details helps reduce selection ambiguity and mismatched assemblies.
Ask the supplier to confirm the exact hose model’s working-pressure rating for the requested size and whether the fittings and assembly method are compatible. Request the relevant datasheet before approving a substitute, especially if a proposed replacement has a different construction, size, or rating. Keep the confirmed product specification with your purchasing and maintenance records.
At Hengshui Xinchi Hose Manufacturing Co., Ltd., we help B2B buyers clarify hose requirements for rubber hydraulic hose orders. Share the bore, pressure, fluid, temperature, length, fittings, and application details so we can review the requested specification and identify information that still needs confirmation. We can also discuss product options and quotation requirements based on the details provided.
For safety-critical or unusual duty, final approval should come from the equipment designer or a qualified hydraulic professional using the system data and the selected product’s documentation. A supplier review is useful for checking product specifications, but it does not replace engineering validation of the complete hydraulic circuit.
Match 4SH hose selection by checking pressure and diameter as related but separate requirements: the hose must meet the system’s working pressure, and its bore must suit the required flow and installation. Treat burst pressure only as a specified test limit, not as an operating allowance, and verify pressure ratings for the exact size in the current datasheet. Finally, confirm that fittings, assembly, temperature, fluid compatibility, and routing are all appropriate.
Before requesting a quotation, prepare your pressure requirement, hose size, flow information, fluid and temperature conditions, length, and end connections. If any system pressure data is uncertain, confirm it with the equipment designer before ordering. Contact Hengshui Xinchi Hose Manufacturing Co., Ltd. with these specifications to discuss suitable EN 856 4SH hose options and assembly requirements.
If you are looking for more details, kindly visit How to Match 4SH Hose Size to Working and Burst Pressure.