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2026
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06
How to Read a Hydraulic Hose Part Number
GAOKE· THCHNICAL GUID
How to Read a Hydraulic Hose Part Number
A practical reference for procurement engineers, maintenance teams, and equipment managers.
In the hydraulic hose industry, part numbers carry a wealth of technical information — but only if you know how to read them. Misreading a specification is one of the most common causes of incorrect hose selection, which can lead to premature failure, safety hazards, or costly downtime. This guide demystifies the naming conventions used across the most widely adopted international standards.
01 What Do "Specification" and "Part Number" Actually Mean?
These two terms are closely related but distinct:
SPECIFI CATION Technical Parameters The measurable attributes of a product: inner diameter, outer diameter, working pressure, bend radius, temperature range, and material composition. | PART NUMBER/MODEL COD Product Identity A unique alphanumeric identifier representing a specific product design, construction type, or series — used to distinguish between variants. |
Together, they form the full specification code that appears on hose labels, data sheets, and procurement documents. Understanding both is essential for correct identification and replacement.
02 Common High-Pressure Hose Types
High-pressure hydraulic hoses are classified primarily by their reinforcement construction. Below are the most commonly specified types:
Type Code | Construction | Pressure Range | Standard |
1SN / R1AT | Single wire braid | Up to 180 bar | SAE 100R1 · EN 853 1SN |
2SN / R2AT | Double wire braid | Up to 400 bar | SAE 100R2 · EN 853 2SN |
4SP | 4-spiral wire | Up to 420 bar | SAE 100R12 |
4SH | 4-spiral, compact | Up to 480 bar | SAE 100R13 |
Wire-braided hoses (1SN, 2SN) are the most widely used in general hydraulic systems. Spiral-wound hoses (4SP, 4SH) are preferred in high-cycle, high-pressure applications such as excavators, mining equipment, and industrial presses.
03 Decoding a Hose Part Number — Step by Step
Let's break down a real-world example from Gaoke's product range:
2SN · 12 · 19 2SN → Hose type — double wire braid construction Conforms to EN 853 2SN / SAE 100R2AT 12 → Nominal bore size — DN12 (approx. ½ inch) Inner diameter in mm; SAE dash size equivalent: -8 19 → Outer diameter — 19 mm Used for installation clearance and fitting selection Note: some manufacturers append a suffix (e.g. -HT for high temperature). Always cross-reference with the product datasheet. |
04 Standard vs. Dash Size: Avoiding the Common Mistake
One of the most frequent sources of confusion is the difference between metric DN sizing (used in EN/ISO standards) and SAE dash sizes (used in American standards). They do not map 1:1, and using the wrong reference table will result in the wrong hose.
EN/ISO — Metric (DN) | Bore | SAE — Dash Size |
DN 6 | ¼ inch | -4 |
DN 10 | ⅜ inch | -6 |
DN 13 | ½ inch | -8 |
DN 16 | ⅝ inch | -10 |
DN 19 | ¾ inch | -12 |
DN 25 | 1 inch | -16 |
| Key rule: the SAE dash number is NOT the bore in millimeters. A "-12" hose has a ¾ inch (19 mm) bore — not a 12 mm bore. Always confirm which standard your application references before ordering. |
05 Practical Selection Tips
→ Always specify the working pressure first, then select the hose type that exceeds it with an appropriate safety factor (typically 4:1).
→ Match the standard (SAE vs EN/ISO) to your fitting system — mixing standards leads to dimensional mismatches at the crimp interface.
→ For mobile equipment subject to vibration and movement, prefer wire-braided hoses for flexibility; use spiral-wound hoses where impulse cycles exceed 500,000.
→ When replacing an existing hose, record the full markings on the hose body — manufacturers print the type, size, pressure rating, and production batch directly on the cover.
Need help selecting the right hose? Gaoke's engineering team can match specifications from a part number, sample, or drawing. www.gaokerubber.com · hl@gaokexiangsu.com |
This document is for technical reference purposes. All data reflects standard industry specifications.
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How to Read a Hydraulic Hose Part Number
2026-06-05
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