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Hydraulic Dash Size, Pressure & Velocity Converter

Cross-reference hose dash sizes (-02 to -32) with metric ID, fractional inches, and DN sizes; convert pressure (bar/psi/MPa) and evaluate flow velocity.

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Fill in the details, then click Generate Results.

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How to use Hydraulic Dash Size, Pressure& Velocity Converter

  1. Enter Hose Dash size / inner diameter and adjust the options as needed.
  2. Run the tool and inspect its results, evidence and limitations.
  3. Copy or download the result, then verify it against the actual website, source data or business records.

Try a concrete example

-08 hose is nominal 1/2" (12.7 mm ID / DN12); 250 bar equals 3626 psi / 25.0 MPa. At 45 L/min, flow velocity is 5.92 m/s within recommended pressure line range (4.5~7.5 m/s), matching JIC 3/4-16 and BSPP G 1/2.

How to interpret results

Integrates global hydraulic Dash matrices, SAE J517/ISO standards and fluid dynamics equations with a velocity gauge and standard thread cross-references.

Frequently asked questions

What is the Dash size system used in hydraulics?

Dash sizes represent sixteenths of an inch: -04 is 4/16" (1/4"), -08 is 8/16" (1/2"), -16 is 16/16" (1"), and -32 is 32/16" (2"). The DN system represents nominal millimetre equivalents under ISO/DIN.

How to quickly convert between bar, psi, and MPa?

1 bar ≈ 14.504 psi, 1 MPa = 10 bar (~145 psi), and 1 kgf/cm² ≈ 0.98 bar. Quick field approximations: 210 bar ≈ 3000 psi, 350 bar ≈ 5000 psi, and 420 bar ≈ 6000 psi.

What are recommended flow velocities for suction, return, and pressure lines?

Suction lines recommend 0.6 to 1.2 m/s to prevent pump cavitation; return lines recommend 1.5 to 4.5 m/s to avoid excessive backpressure and foaming; pressure lines recommend 4.5 to 7.5 m/s.

Why do hoses with the same dash inner diameter have different outer diameters?

Dash size only determines internal diameter (ID). Outer diameter (OD) depends on reinforcement plies: 1SN single-braid has thin walls, while 4SH or R15 four/six-spiral hoses have thick walls requiring larger clamps and guards.

hydraulic hose dash size and unit converter practical guide and common questions

What does a hydraulic hose dash size and unit converter do?

Dash numbers represent nominal inner diameter in sixteenths of an inch (e.g., -08 = 8/16 = 1/2 in), mapping to European DN sizes and standard fitting threads.

Who is this for, and when is it useful?

Fluid power buyers, international procurement agents and hydraulic system engineers reading multinational drawings.

How do I use this hydraulic hose dash size and unit converter?

Select hose dash size to cross-reference fractional inch, metric mm and DN designations, with live flow velocity rating and bar/psi/MPa pressure conversion.

How should I interpret the results?

Hydraulic sizing balances fluid friction heat against pipe weight: suction lines require 0.6 to 1.2 m/s to prevent pump cavitation, return lines require 1.5 to 4.5 m/s, and high-pressure lines operate at 4.5 to 7.5 m/s.

Where is the work performed, and which services receive data?

Dash size lookups, thread references and flow velocity conversions execute locally in your browser. Fluid specs are not transmitted to any cloud server.