Standard Rectangular Tube Size Table

Introduction

Rectangular steel tubes, also known as Rectangular Hollow Sections (RHS), are widely used structural steel products with a hollow rectangular cross-section. They provide excellent strength-to-weight performance, making them suitable for construction, machinery frames, trailers, agricultural equipment, transportation structures, and industrial fabrication.

Standard rectangular steel tube sizes are commonly available from 20 × 10 mm to 400 × 200 mm, with wall thicknesses typically ranging from 1.6 mm to 16 mm depending on the manufacturing standard and application requirements.
The most common specifications include:
ASTM A500 Rectangular Tubing
ASTM A513 Mechanical Tubing
EN 10219 Cold-Formed RHS
EN 10210 Hot-Finished Hollow Sections
This rectangular steel tube sizes chart provides common dimensions, wall thicknesses, and weight information to help engineers, fabricators, and buyers quickly select the right RHS size for their projects.

Basic dimensions and some standards of national standard rectangular tubes

Surface Protection: Pre-galvanized, Black (Natural Color Without Coating), Hot-dip Galvanized, Varnish/Oil Coated

Standard Rectangular Tube Size & Weight Chart

Advantages of national standard rectangular tubes

How to Read Rectangular Tube Sizes？

Rectangular tube dimensions are normally expressed as:
Width × Height × Wall Thickness
For example:
100 × 50 × 4 mm
Width: 100 mm
Height: 50 mm
Wall thickness: 4 mm

The larger the wall thickness, the higher the weight and load-bearing capacity. Tubes with larger cross-sections also provide greater bending resistance, making them suitable for structural applications requiring higher strength.

Common Standards for Rectangular Steel Tubes

Although rectangular steel tubes are manufactured worldwide, most projects follow one of the following standards.

Standard	Application	Common Grades
ASTM A500	Structural tubing	Grade A, B, C
ASTM A513	Mechanical tubing	Various mechanical grades
EN 10219	Cold-formed structural hollow sections	S235JRH, S275J0H, S355J2H
EN 10210	Hot-finished structural hollow sections	S235, S275, S355

Different standards specify dimensional tolerances, mechanical properties, and manufacturing methods, but many standard rectangular tube sizes are available across multiple specifications.

Common Rectangular Tube Sizes

Although rectangular steel tubes are manufactured in hundreds of dimensions, a few sizes are widely used across construction, manufacturing, and fabrication industries.

Size (mm)	Common Wall Thickness (mm)	Typical Applications
40 × 20	1.6–3.0	Furniture, shelving, light frames
50 × 25	2.0–3.0	Gates, fences, trailers
60 × 40	2.0–4.0	Machinery frames, support structures
80 × 40	2.5–5.0	Structural fabrication, platforms
100 × 50	2.5–6.0	Columns, equipment bases
120 × 80	3.0–8.0	Buildings, bridges, heavy fabrication
150 × 100	4.0–10.0	Industrial structures
200 × 100	5.0–10.0	Heavy-duty support systems
250 × 150	5.0–10.0	Large steel structures
300 × 200	6.0–10.0	Infrastructure projects
400 × 200	8.0–16.0	Heavy engineering and bridge construction

The required size depends on the design load, span length, fabrication method, and service environment. Larger cross-sections generally provide higher bending strength, while increasing wall thickness improves compression and impact resistance.

Full Rectangular Steel Tube Size Chart and Weight Table

Rectangular steel tubes are available in a wide range of dimensions to meet different structural and fabrication requirements. The most important specifications when selecting an RHS include outside width, outside height, wall thickness, and weight per meter.
The following table shows commonly used rectangular hollow section sizes.

Rectangular Tube Dimensions and Weight Chart

Size (W × H)	Wall Thickness	Weight (kg/m)
20 × 10 mm	1.6 mm	0.7
30 × 20 mm	2.0 mm	1.45
40 × 20 mm	2.0 mm	1.76
40 × 20 mm	3.0 mm	2.55
50 × 25 mm	2.0 mm	2.14
50 × 30 mm	3.0 mm	3.53
60 × 40 mm	2.5 mm	3.72
60 × 40 mm	4.0 mm	5.62
80 × 40 mm	3.0 mm	5.45
80 × 40 mm	5.0 mm	8.64
100 × 50 mm	3.0 mm	6.86
100 × 50 mm	4.0 mm	8.79
120 × 60 mm	4.0 mm	10.05
150 × 75 mm	5.0 mm	16.6
200 × 100 mm	6.0 mm	26.7
250 × 150 mm	8.0 mm	47.2
300 × 200 mm	10.0 mm	74
400 × 200 mm	12.0 mm	105

Frequently Asked Questions

What is the standard size of a rectangular steel tube?
Standard sizes typically range from 40 × 20 mm to 400 × 200 mm, although manufacturers can also produce custom dimensions for specific projects.

How are rectangular tube sizes measured?
Rectangular tubes are identified by outside width × outside height × wall thickness, such as 100 × 50 × 4 mm.

Which standard is commonly used for structural rectangular tubing?
ASTM A500 is one of the most widely used standards for structural rectangular steel tubing in North America, while EN 10219 is commonly used in Europe.

How do I calculate the weight of a rectangular tube?
The theoretical weight depends on the outside dimensions, wall thickness, steel density, and tube length. Most engineers use standard weight charts, such as the one provided above, for quick reference.

Can rectangular steel tubes be galvanized?
Yes. Rectangular tubes are commonly supplied in black steel, pre-galvanized, or hot-dip galvanized finishes depending on the application and corrosion resistance requirements.