HOW TO MEASURE / TECHNICAL INFORMATION

When choosing a hydraulic hose, hydraulic hose sizes like length and diameter should be given careful consideration. Temperature and pressure range, hydraulic hose material, the fitting requirement should also be considered.

It is critical hydraulic hoses are made to the correct size and specification to your requirements. Please use our Step-by-Step Guide below to help you calculate your required Hydraulic Hose/Fittings.

Does your hydraulic hose show any information on it? If so, simply just refer to this when building your Hydraulic Hose and Build Your Hose straight away! (For fitting/thread information please see below)
How to Measure Hydraulic Hoses

STEP 1 - HOSE INTERNAL DIAMETER SIZE

Locate the two ends of the hose that you want to measure.

Using a ruler or tape measure, measure the distance across the inside of the hose from one inner edge to the other. This measurement represents the inside diameter (ID) of the hose.

If the hose has a cover or sheath, do not include this in your measurement. Only measure the inside diameter of the hose itself.

If you are measuring a hose with angled or curved ends, measure the diameter at the widest point of the hose.

Record the measurement in inches or millimetres, depending on the unit of measurement you prefer. Refer to the Hose Identification Chart below to work out which hose size you require.
How to Measure Hydraulic Hoses

STEP 2 - OVER-ALL LENGTH

The overall length of the hydraulic hose assembly is measured to the sealing surface of straight fittings or to the centreline of elbow fittings.

Use the image below as a guide. Record your measurement in millimetres.
How to Measure Hydraulic Hoses

STEP 3 - HOSE SPECIFICATION (PRESSURE/FLUIDS/TEMPERATURE/FLEXABILITY)

Pressure rating is one of the most important things you should look for in the hydraulic hose. The pressure of the fluid that will be passed through the hose. It is very important. If you choose a hose pipe with a higher-pressure rating, it will not cause much of a problem. Your problem will begin if the pressure of the fluid is more than what the hose can sustain.

You also need to consider the fluid that will pass through your hydraulic hose. There are multiple fluids that can be transmitted, and all the fluids are not the same.

Temperature conditions of the fluid as well as in some cases the outside temperature is also vital.

Flexibility is a vital element, as we know that most of the time, hydraulic hoses will tend to move around with the machines. It will go in the direction and provides the ability of the machines to be flexible.

Please see charts below of hose specifications and pressure ratings to identify which you need.

Vitillo - Wire Braid Hydraulic Hose EN853 1SN

SAE 100R1AT/DIN EN 853 1SN STANDARD Black, oil an environment resistant synthetic rubber Reinforcement: One high tensile steel braid Cover: Abrasion and weather resistant synthetic rubber Temperature: -40 Degree C to +100 Degree C. Qualified Fluids: mineral oils, vegetable and rapeseed oils, synthetic ester-based oils, oils in aqueous emulsion, water
How to Measure Hydraulic Hoses

Vitillo - Wire Braid Hydraulic Hose EN853 2SN

SAE 100R2AT/DIN EN 853 2SN STANDARD Black, oil an environment resistant synthetic rubber Reinforcement: One high tensile steel braid Cover: Abrasion and weather resistant synthetic rubber Temperature: -40 Degree C to +100 Degree C Qualified Fluids: mineral oils, vegetable and rapeseed oils, synthetic ester-based oils, oils in aqueous emulsion, water
How to Measure Hydraulic Hoses

Vitillo - Wire Braid Hydraulic Hose EN857 2SC

DIN-EN857 2SC STANDARD Black, oil an environment resistant synthetic rubber Reinforcement: One high tensile steel braid Cover: Abrasion and weather resistant synthetic rubber Temperature: -40 Degree C to +100 Degree C Qualified Fluids: mineral oils, vegetable and rapeseed oils, glycol and polyglicol based oils, synthetic ester based oils, oils in aqueous emulsion, water
How to Measure Hydraulic Hoses

Vitillo - Wire Spiralled Reinforced Hose EN856 4SP

DIN-EN856 4SP Standard Black, oil an environment resistant synthetic rubber Reinforcement: Four high tensile steel spirals Temperature: -40 Degree C to +100 Degree C Qualified Fluids: mineral oils, vegetable and rapeseed oils, glycol and polyglicol based oils, synthetic ester based oils, oils in aqueous emulsion, water
How to Measure Hydraulic Hoses

Vitillo - Wire Spiralled Reinforced Hose EN856 4SH

Black, oil an environment resistant synthetic rubber Reinforcement: Four high tensile steel spirals Temperature: -40 Degree C to +100 Degree C Qualified Fluids: mineral oils, vegetable and rapeseed oils, glycol and polyglicol based oils, synthetic ester based oils, oils in aqueous emulsion, water
How to Measure Hydraulic Hoses

STEP 4 - FITTINGS IDENTIFICATION

There are many different thread types and fittings for hydraulic hoses, so it is important to identify the correct type. Using the charts and measurements below you can identify which fittings you require.

BSP Thread Identification

British Standard Pipe (BSP)
Also referred to as Whitworth threads, the BSP thread type fittings seal using metal to metal angled surfaces or a combination of metal to metal and an O-ring. The angle of the sealing surfaces is 60° for both forms.
There are two popular thread forms, British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT).
Identification is made by measuring the outside diameter of the thread and the number of threads per inch (25.4 mm)
How to Measure Hydraulic Hoses

JIC Thread Identification

JIC - Joint Industry Council Thread - SAE JIC 37°
Commonly referred to as just JIC fittings these metal to metal sealing type fittings have a 37° flare (sealing surface angle) and straight United National Fine straight Threads (UNF).
The original design specification for the fittings comes from the Society of Automotive Engineers (SAE) and these fittings are the most common American fitting type in Europe.
Standard
ISO 12151-5 2), ISO8434-2 and SAE J516 The most commonly found sizes on hydraulic hose are below:
1/4" hose - 9/16" JIC
3/8" hose - 9/16" JIC / 3/4" JIC 1/2" hose - 7/8" JIC
3/4" hose - 1.1/16" JIC
1" hose - 1.5/16" JIC
How to Measure Hydraulic Hoses

Metric Thread

DIN 24° Light (L) and Heavy Series (S) with O-ring The male has a 24° sealing angle cone seat with straight metric threads.
The female has a 24° convex cone with O-ring and a swivel straight metric threaded nut.
Standard
ISO 12151-2 / ISO 8434-1 & ISO 8434-4 The most commonly found sizes on hydraulic hose are below:
1/4" hose - 10L Metric 3/8" hose - 12L Metric 1/2" hose - 15L Metric 3/4" hose - 22L Metric 1" hose - 28L Metric
How to Measure Hydraulic Hoses

O-ring Face Seal (ORFS)

ORFS fittings are becoming the most popular international fitting type used on global OEM machines due to their high level of sealing and their good vibration resistance. The fittings use the O-ring compression mechanism to seal.
The female fittings have flat faces and straight threaded UNF swivel nuts. The male fittings have the O-ring in a groove in the flat face.
Seen as a major advantage, these fittings offer the possibility to build the hose assemblies into fixed distances/spaces, without having to move back other system components due the flat faces of the male and female fittings - the hose assembly can be slotted in.
Standard
ISO 12151-1, ISO8434-3 and SAE J516
The most commonly found sizes on hydraulic hose are below:
1/4" hose - 9/16" ORFS
3/8" hose - 11/16" ORFS
1/2" hose - 13/16" & 1" ORFS 3/4" hose - 1.3/16" ORFS
1" hose - 1.7/16" ORFS
How to Measure Hydraulic Hoses

Flange Thread

Code 61 Type – Flange 3000
The 4-bolt split flange (or full flange) fitting is used worldwide for connecting high pressure hoses typically to pumps, motors and cylinders, where the hose assemblies are subjected to large pressure loadings.
The sealing mechanism is through compression of the O-ring in the face of the flange head against the surface of the port/ connection.
The flange fittings are generally separated into two pressure classes referred to as 3000 psi (SFL) or 6000 psi (SFS).
ISO 12151-3 refers to the flange fittings as code 61 for the 3000 psi and code 62 for the 6000 psi.
In addition to these flanges, customer specific Komatsu® and CATERPILLAR® flanges can also be found in the market.
How to Measure Hydraulic Hoses

Flange Thread

Code 62 Type – Flange 6000
The 4-bolt split flange (or full flange) fitting is used worldwide for connecting high pressure hoses typically to pumps, motors and cylinders, where the hose assemblies are subjected to large pressure loadings.
The sealing mechanism is through compression of the O-ring in the face of the flange head against the surface of the port/ connection.
The flange fittings are generally separated into two pressure classes referred to as 3000 psi (SFL) or 6000 psi (SFS).
ISO 12151-3 refers to the flange fittings as code 61 for the 3000 psi and code 62 for the 6000 psi.
In addition to these flanges, customer specific Komatsu® and CATERPILLAR® flanges can also be found in the market.
How to Measure Hydraulic Hoses

NPT Thread

National Pipe Thread (NPT): the special characteristic of this style of thread that is going to help you identify it is the presence of an inverted 30° seat in the female half and an 30° internal chamfer in the male half.
How to Measure Hydraulic Hoses

STEP 5 - BUILD YOUR HOSE ONLINE NOW!

Click Hydraulic Hose Builder to start your custom Hydraulic Hose Assembly in just 5 Simple Steps! 
Free Next Day Delivery available for all UK orders.
Copyright © 2026 Rapid Hydraulic Hoses   |   Website & SEO by Radikls