Hydraulic Tubes for Industrial Fluid Power Systems

Hydrofit Engineers supplies hydraulic tubes for rigid fluid power lines used between pumps, valves, manifolds, cylinders and other hydraulic components. Selection depends on more than nominal size: outside diameter, wall thickness, material grade, surface condition and the mating connection all affect suitability. Based in Chennai, Hydrofit supports industrial tube requirements for customers across India.

This page covers the broad hydraulic tube category and the information needed for selection and enquiry. Buyers who need detailed seamless construction, grades and dimensional information can review the dedicated hydraulic seamless tubes range.

Hydraulic Tube Range and Verified Product Information

Hydrofit’s published seamless tube range includes ST37/E235 and ST52/E355 grades associated with DIN 2391 and EN 10305 product information. The detailed page lists outside diameters from 4 mm to 190 mm, wall thicknesses from 0.5 mm to 25 mm, NBK condition, phosphating, protective oiling and stated inspection methods. Availability must be confirmed for the required grade, size, condition and quantity.

The broad category does not assign one pressure or temperature value to every tube. Use the applicable engineering specification and size-specific data for the actual circuit.

Why Outside Diameter and Wall Thickness Both Matter

Tube size is normally described by outside diameter and wall thickness. Selecting by OD alone is incomplete because two tubes with the same OD can have different internal dimensions and mechanical behaviour. The requirement may also depend on material grade, working pressure, temperature, fluid, fitting system and the bending needed during fabrication.

For replacement work, use the original machine specification, drawing or a correctly identified sample where available. Do not substitute a nominal pipe size merely because its approximate diameter appears similar.

Matching Hydraulic Tubes with Tube Fittings

The tube is part of the complete connection system. Correct compatibility can require the specified OD and wall thickness, a suitable material and surface condition, the correct fitting series and proper preparation. Hydrofit’s tube fitting guidance explains the connection-specific information buyers should provide.

For cutting-ring connections, the outside surface of the tube interacts with the ferrule during assembly. Review the ferrule fitting range and the separate DIN 2353 connection guide when those systems are specified. These pages describe fitting selection; they do not make a tube suitable merely because its OD appears to match.

Tube Condition, Cutting and Preparation

Keep tube ends and internal surfaces clean before assembly. Cut the tube correctly, remove burrs without damaging the connection area and check that the outside surface is not scored, flattened or otherwise damaged where the fitting will grip or seal. Poorly executed bends can distort the tube and make alignment difficult.

A prepared tube should enter the mating fitting without being pulled into position by tightening. Routing, support and bending requirements should be considered before cutting so that assembly does not leave avoidable stress at a joint.

Hydraulic Tube and Pipe Are Different Purchasing Descriptions

Tube is commonly specified by outside diameter and wall thickness, while pipe generally follows nominal sizing conventions. The distinction matters because many mechanical tube connections are designed around a defined tube OD. Buyers should identify whether the requirement is precision tubing for a rigid hydraulic line or pipe for a different connection method.

Where Hydraulic Tubes Are Used

Rigid tube lines are used in hydraulic power packs, industrial machinery, machine tools, construction and material-handling equipment, agricultural machinery and manufacturing systems. They suit fixed sections that require controlled routing and stable positioning. The tube, its fittings and the line supports should be considered together for the actual machine environment.

Information Required When Ordering Hydraulic Tubes

A technically useful enquiry should include:

• Tube outside diameter and wall thickness
• Material or grade
• Required standard or existing specification
• Length and quantity
• Operating pressure, fluid or media and temperature where known
• Surface or finish requirement
• Cut-length or bending requirement, where applicable
• The fitting or connection system that will be used
• A drawing, part reference or sample details for replacement work

If the connection family is still being selected, the broader hydraulic fittings range provides an overview of the available systems.

Hydraulic Tube Supply Across India

Hydrofit Engineers is based in Chennai and supplies hydraulic tubes and related connection products to industrial customers across India. Availability, material, dimensions, finish, quantity and delivery requirements should be confirmed for each enquiry.

Frequently Asked Questions About Hydraulic Tubes

How is hydraulic tube size specified?

A purchase requirement normally identifies the tube outside diameter and wall thickness, together with the required material or grade and standard.

Why does wall thickness matter?

Wall thickness affects the tube’s internal dimension and mechanical behaviour. It must be assessed with OD, grade, pressure, temperature, fluid and connection requirements.

How are hydraulic tubes matched with tube fittings?

Match the tube OD, wall thickness, material and surface condition with the specified fitting family and series. Correct tube preparation is also part of the connection.

What is the difference between this page and the Hydraulic Seamless Tubes page?

This page covers the broad hydraulic-tube category and purchasing process. The seamless-tube page contains the detailed grades, standards, dimensions and condition information for that specific range.

What information should I send for a quotation?

Send the OD, wall thickness, grade, standard, length, quantity, service conditions, finish requirement and fitting system. Add a drawing or original reference when replacing an existing line.

Does Hydrofit supply hydraulic tubes across India?

Yes. Hydrofit is based in Chennai and serves industrial customers across India, subject to confirmation of the required tube specification and availability.