How is a hydraulic hose specified?
By four things, in order: bore, working pressure at that bore, bend radius, and the fluid and temperature. The grade designation — 2SN, R13, 4SH — falls out at the end as a result of those four. Starting from the designation is the most common way to specify the wrong hose.
The articles below take the standards one at a time. What follows is the map: four reinforcement families, what each is for, and the single fact that decides between them.
| Family | Grades | Pressure behaviour as bore rises | Typical use |
|---|---|---|---|
| Wire braid | 1SN / R1AT, 2SN / R2AT | Falls steeply — 2SN loses four fifths from −04 to −32 | General high-pressure service |
| Compact braid | 1SC, 2SC | As braid, in roughly half the bend radius | Tight routing at braid pressures |
| Wire spiral | 4SP, 4SH, R13, R15 | Almost flat — R13 holds 350 bar across its whole range | Large bore, high pressure, impulse duty |
| Textile / thermoplastic | R5, R6, R7, R14 | Low throughout; selected on medium, not pressure | Return, suction, chemical, tight routing |
Where to start
I have a designation and need to know what it means.
Start with the SAE 100R article — it explains why the numbers are a catalogue rather than a ranking, and gives the working pressures by bore for every grade we stock.
My drawing says EN and my supplier quotes SAE.
The cross-reference article covers which pairings are genuine, which are approximations worth checking, and which have no counterpart at all.
I need the pressure at a particular size.
The pressure-by-size article carries the full per-bore tables for every construction, small bore and large.
I am reading markings off a hose in front of me.
The layline article decodes every element printed on the cover, and covers what to do when the printing has worn away.
Hydraulic hose by grade
Every construction discussed here, cut and crimped in Dubai.
Specifying against a drawing?
Send the designation, the bore and the working pressure. We will tell you what genuinely matches, what is an approximation, and what has no equivalent in our range.
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