Hydraulic Size Chart

Hydraulic hoses are critical components used to transfer pressurized hydraulic fluid between system components. Selecting the correct hose size ensures proper flow, pressure stability, and system efficiency.

A hydraulic hose size chart helps engineers quickly identify hose dimensions, dash sizes, inner diameter, and recommended flow capacity.

1. What Is a Hydraulic Hose Size?

Explanation of:

Inner Diameter (ID)
Outer Diameter (OD)
Dash size system
Pressure rating

Example:

Dash Size	Hose ID	Inch
-4	1/4″	6.4 mm
-6	3/8″	9.5 mm
-8	1/2″	12.7 mm
-10	5/8″	15.9 mm
-12	3/4″	19.1 mm
-16	1″	25.4 mm

2. Hydraulic Hose Dash Size Chart

Full table of:

Dash size
Inner diameter
Outer diameter
Recommended flow

3. Hydraulic Hose Flow Capacity Chart

Explain velocity recommendations:

Fluid	Velocity
Suction lines	2–4 ft/s
Return lines	5–10 ft/s
Pressure lines	15–20 ft/s

4. Hydraulic Hose Pressure Ratings

Explain:

Working pressure
Burst pressure
Safety factor

5. How to Select the Correct Hose Size

Steps:

Determine flow rate
Check velocity limits
Choose hose diameter
Verify pressure rating

6. Common Hydraulic Hose Standards

SAE J517
ISO 18752
EN 853 / EN 856

7. Applications

Excavators
Industrial hydraulic presses
Construction equipment
Oil & gas systems

2. Hydraulic Cylinder Size Chart

Hydraulic cylinders convert hydraulic pressure into mechanical force. Proper sizing is essential for load capacity and system performance.

A hydraulic cylinder size chart provides reference values for bore size, rod diameter, and output force.

1. Hydraulic Cylinder Dimensions

Explain:

Bore diameter
Rod diameter
Stroke length

2. Cylinder Bore Size Chart

Bore Size	Area	Force @ 3000 PSI
1 in	0.785 in²	2355 lb
2 in	3.14 in²	9420 lb
3 in	7.07 in²	21210 lb
4 in	12.57 in²	37710 lb

3. Cylinder Force Chart

Formula:

Force = Pressure × Area

4. Cylinder Speed Chart

Speed depends on:

Flow rate
Cylinder area

5. How to Select Cylinder Size

Steps:

Determine required force
Check operating pressure
Calculate bore size
Select stroke length

6. Common Hydraulic Cylinder Applications

Excavators
Hydraulic presses
Lifting equipment
Manufacturing automation

3. Hydraulic Fitting Size Chart

Hydraulic fittings connect hoses, pipes, and valves within a hydraulic system. Proper sizing ensures leak-free connections and system safety.

1. Types of Hydraulic Fittings

NPT
BSP
JIC
ORFS
Metric

2. Hydraulic Fitting Size Chart

Dash Size	Thread	Tube OD
-4	1/4	1/4″
-6	3/8	3/8″
-8	1/2	1/2″
-10	5/8	5/8″
-12	3/4	3/4″

3. Thread Types Explained

NPT vs BSP vs JIC differences.

4. Pressure Ratings of Hydraulic Fittings

Discuss:

material
connection type
sealing method

5. How to Identify Hydraulic Fitting Size

Tools:

thread gauge
caliper
reference charts

6. Applications

Hydraulic equipment
Oil & gas
Mobile machinery
Industrial automation

4. Hydraulic Pipe Size Chart

Hydraulic pipes transport fluid under pressure between system components. Correct pipe sizing reduces pressure drop and improves system efficiency.

1. Hydraulic Pipe Size Basics

Explain:

Nominal pipe size (NPS)
Inner diameter
Wall thickness

2. Hydraulic Pipe Size Chart

Pipe Size	ID	Flow Capacity
1/4	0.364 in
3/8	0.493 in
1/2	0.622 in
3/4	0.824 in
1	1.049 in

3. Flow Velocity Chart

Recommended velocity:

System	Velocity
Suction	2–4 ft/s
Return	5–10 ft/s
Pressure	10–20 ft/s

4. Pressure Drop Considerations

Explain:

pipe diameter
pipe length
viscosity

5. Hydraulic Pipe Materials

Carbon steel
Stainless steel
Alloy steel

6. Standards

ASTM
SAE
ISO

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Hydraulic Hose Size Chart: Complete Guide to Sizes, Standards & Selection

A Hydraulic Size Chart is a technical reference table used by engineers and technicians to identify and select the correct sizes of hydraulic components used in hydraulic systems. These charts provide standardized dimensions and specifications for components such as hydraulic hoses, fittings, cylinders, pipes, and valves.

Hydraulic systems rely on precise component sizing to ensure efficient fluid flow, pressure control, and safe operation. Hydraulic size charts help simplify this process by presenting key parameters—such as inner diameter, outer diameter, dash sizes, thread sizes, pressure ratings, and flow capacity—in a clear and organized format.

For example, a hydraulic hose size chart typically includes dash numbers, hose inner diameter, and recommended flow rates. A hydraulic fitting size chart may list thread types such as NPT, BSP, JIC, and ORFS, along with their corresponding dimensions. Cylinder size charts show bore diameter, rod diameter, and force output at different pressure levels.

Using a hydraulic size chart allows engineers to quickly determine compatibility between components, calculate flow requirements, and avoid costly system failures caused by incorrect sizing.

Hydraulic size charts are widely used in many industries, including:

Oil and gas

Construction equipment

Manufacturing and automation

Mining and heavy machinery

Agricultural machinery

Marine and offshore systems

Because hydraulic systems operate under high pressure, selecting the correct component size is critical for both performance and safety. Size charts provide a reliable engineering reference that supports system design, maintenance, troubleshooting, and equipment upgrades.

In this guide, you will find comprehensive hydraulic size charts covering hoses, fittings, cylinders, pipes, and other essential hydraulic components used in modern hydraulic systems.