The number of wires in a hydraulic hose refers to the number of wire braids that are used in the construction of the hose. These wire braids provide the strength and reinforcement for the hose.
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A 2-wire hydraulic hose has two wire braids, and is typically used for medium pressure hydraulic systems.
A 4-wire hydraulic hose has four wire braids, and is used for high pressure hydraulic systems. It is generally more flexible and durable than a 2-wire hose, and is able to withstand higher pressures.
A 6-wire hydraulic hose has six wire braids, and is used for extremely high pressure hydraulic systems. It is even more flexible and durable than a 4-wire hose, and is able to withstand very high pressures.
In general, the more wire braids a hydraulic hose has, the stronger and more flexible it will be, but it will also be more expensive. The number of wire braids required for a particular application will depend on the pressure and type of fluid being transported through the hose.
4SH is a 4-wire spiral hose that's higher pressure
2SC is a 2-wire braided hose that's considered "compact" bend radius (e.g. half the bend radius of 2SN).
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2SN is a 2-wire braided hose with a "normal" bend radius.
References:
From ISO (section 4):
Type 1ST: hoses with a single braid of wire reinforcement and having a thick cover.
Type 2ST: hoses with two braids of wire reinforcement and having a thick cover.
Types 1SN and R1ATS: hoses with a single braid of wire reinforcement and having a thin cover.
Types 2SN and R2ATS: hoses with two braids of wire reinforcement and having a thin cover.
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