Black Square Steel Pipe (Cold-Formed Steel Sections) – High-Quality from COTCO METAL WORKS
COTCO METAL WORKS offers premium cold-formed steel box sections, certified by both international and Thai Industrial Standards (TIS). Our steel boxes are ideal for various applications including building structures, steel beams, and roofing frameworks. If you seek durable, versatile steel boxes, discover key insights and product details here.
What is a Black Square Steel Pipe?
Also known as square tubes, rectangular tubes, or “แป๊บเหลี่ยม” in Thai, steel boxes are hollow, cold-formed steel sections shaped into square or rectangular profiles. They offer excellent strength, durability, and flexibility, making them easy to weld, bend, and install. Available in black steel and pre-zinc galvanized finishes, they resist rust and reduce painting needs.
Common uses include:
Types of Steel Box
-
Square Steel Pipe (แป๊บเหลี่ยม)
-
Hollow square profile with 90° corners
-
Smooth surface, standard length 6 meters
-
Ideal for general construction, load-bearing structures, scaffolding, furniture, and decorative works
-
Rectangular Steel Pipe (แป๊บแบน)
-
Hollow rectangular profile with 90° corners
-
Space-saving design suited for doors, railings, staircases, and customized spaces
-
Also 6 meters long per standard piece
Advantages & Limitations
Advantages:
-
High strength and durability
-
Flexible for bending with minimal deformation
-
Excellent vibration resistance
-
Ready-to-use for easy installation
-
Variety of sizes available
-
Lightweight and easy to transport
-
Can substitute wood and concrete
-
Versatile for construction, structural, and general uses
Limitations:
-
Not suitable for very heavy load structures
-
Non-galvanized types require rust protection paint before use
-
Must consider corrosion risks in harsh environments
Applications
-
Structural supports, scaffolding, roofing frames in residential and commercial buildings
-
Extensions such as balcony railings and staircases
-
Furniture framework and multi-purpose shelving
How to Choose Black Square Steel Pipe for Best Value
-
Standards: Look for TIS 107-2566 or other international certifications like JIS for assured quality
-
Usage: Select square pipes for stronger load needs, rectangular pipes for space-efficient designs
-
Quality: Ensure sharp 90° corners, smooth finish, and standard length (6 meters)
COTCO METAL WORKS Black Square Steel Pipe Products
We supply certified steel boxes in square and rectangular profiles suitable for various construction and structural needs. Both types are available in black steel and pre-zinc galvanized finishes, offering durability and corrosion resistance.
Steel Box Sizes & Specifications (Selected Examples)
|
Side Length AxB
|
Wall Thickness
|
Unit Mass
|
Packing
|
|
Size (Inch)
|
Dimension (mm)
|
mm
|
Weight (kg/m)
|
Weight per 6m (kg)
|
Pieces per Bundle
|
|
2 x 1
|
50.8 x 25.4
|
1.20
|
1.36
|
8.17
|
135
|
|
1.60
|
1.78
|
10.69
|
135
|
|
1.80
|
1.99
|
11.92
|
135
|
|
2.00
|
2.19
|
13.12
|
135
|
|
2.30
|
2.48
|
14.87
|
135
|
|
3 x 1 ½
|
75 x 38.1
|
1.60
|
2.71
|
16.25
|
60
|
|
2.00
|
3.34
|
20.07
|
60
|
|
2.30
|
3.81
|
22.87
|
60
|
|
3.10
|
5.01
|
30.05
|
60
|
|
4 x 2
|
100 x 50
|
1.60
|
3.64
|
21.82
|
35
|
|
2.30
|
5.14
|
30.86
|
35
|
|
3.20
|
7.01
|
42.05
|
35
|
|
4.50
|
9.55
|
57.31
|
35
|
|
6 x 2
|
150 x 50
|
2.30
|
6.95
|
41.69
|
24
|
|
3.20
|
9.52
|
57.12
|
24
|
|
4.00
|
13.08
|
78.51
|
24
|
|
95 x 35
|
2.30
|
4.42
|
26.52
|
35
|
|
3.20
|
6.00
|
36.00
|
35
|
|
8 x 4
|
200 x 100
|
4.50
|
20.15
|
120.90
|
8
|
|
6.00
|
26.40
|
158.40
|
8
|
|
9.00
|
38.21
|
229.26
|
8
|
|
Side Length AxB
|
Wall Thickness
|
Unit Mass
|
Packing
|
|
Size (Inch)
|
Dimension (mm)
|
(mm)
|
Weight (kg/m)
|
Weight per 6m (kg)
|
Pieces per Bundle
|
| 3/4 x 3/4 |
19.1 x 19.1 |
1.20 |
0.65 |
3.87 |
256 |
| 1.60 |
0.83 |
4.96 |
256 |
| 7/8 x 7/8 |
22.1 x 22.1 |
1.20 |
0.76 |
4.55 |
256 |
| 1.60 |
0.98 |
5.87 |
256 |
| 2.00 |
1.18 |
7.08 |
256 |
