How To Measure A Hydraulic Hose | Size & Fitting Guide

A practical guide to measuring hydraulic hose length, size and fittings correctly.

Measuring a hydraulic hose correctly is important when replacing damaged hoses, identifying fittings or ordering a new hose assembly.

Incorrect measurements can lead to fitting problems, routing issues, pressure loss and premature hose failure.

This guide explains how to measure hydraulic hose length, hose size, fittings and fitting angles to help identify the correct replacement assembly.

For a wider guide to hose types, construction and applications, visit our hydraulic hoses comprehensive guide.

Quick Answer:

To measure a hydraulic hose correctly you normally need to figure out:

Overall hose length
Internal hose size
Fitting type
Fitting size
Fitting angle

What Measurements Are Needed?

Hydraulic hose assemblies are normally identified using a combination of hose size, hose length and fitting information.

The most important measurements include:

Internal hose diameter
Overall hose length
Thread size
Thread type
Fitting orientation
Fitting seat style

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How To Measure Hydraulic Hose Length

Hydraulic hose length is normally measured from fitting centre point to fitting centre point.

Different fitting styles may slightly change the measuring points.

Fitting Type	Typical Measurement Method	Important Notes
Straight x Straight	Centre to centre	Most common method
90° Elbow	Centreline reference	Angle orientation matters
Flange Fittings	Flange face to centre	Check bolt pattern

Important:

Hydraulic hose assemblies should not be measured while under pressure or connected to an active hydraulic system.

How To Measure Hydraulic Hose Size

Hydraulic hose size is usually based on the internal diameter of the hose.

Many hydraulic hoses use dash sizes such as:

The dash size normally relates to the hose internal diameter in sixteenths of an inch.

Check Hose Markings

Many hydraulic hoses have printed laylines showing hose size, pressure rating and manufacturer details.

Measure Internal Diameter

If markings are unreadable, the hose internal bore can often be measured carefully using calipers.

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How To Measure Hydraulic Fittings

Hydraulic fittings should be measured carefully because many thread types look similar.

Common fitting measurements include:

Thread outside diameter
Thread pitch
Seat angle
Fitting orientation
Male or female thread type

Common hydraulic fitting types include:

BSP fittings
JIC fittings
Metric fittings
ORFS fittings
Flange fittings

How To Identify Hydraulic Hose Angles

Hydraulic hoses may use:

Straight fittings
45° fittings
90° fittings
Special orientation fittings

Angle orientation matters because incorrectly aligned fittings may twist the hose and shorten hose life.

Infographic for how to measure a hydraulic hose

Common Hydraulic Hose Measuring Mistakes

Measuring overall length incorrectly
Ignoring fitting orientation
Confusing BSP and JIC threads
Measuring outside diameter only
Ignoring hose layline markings
Using damaged fittings for identification
Guessing hose size without checking

Correct Measurement Helps Prevent Failure

Correct hose measurement improves fitment, routing, flow performance and overall hydraulic reliability.

Need Help Measuring A Hydraulic Hose?

Completely Hydraulic can help identify hydraulic hose sizes, fittings and replacement assemblies.

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Related Hydraulic Hose Guides

Hydraulic Hose Measurement FAQs

How is hydraulic hose length measured?

Hydraulic hose length is normally measured from fitting centre point to fitting centre point.

How do I identify hydraulic hose size?

Many hoses include printed layline markings showing hose size and pressure specifications.

Can I measure hydraulic fittings myself?

Basic fitting measurements can often be taken using calipers and thread gauges, although professional identification may still be required.

What happens if a hydraulic hose is measured incorrectly?

Incorrect measurements can cause leaks, routing problems, pressure loss and reduced hose life.

Need Help Identifying A Hydraulic Hose?

If you are unsure about hose measurements, fittings or replacement options, Completely Hydraulic can help.

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