Steel Supply · Dasmariñas, Cavite

Steel tubular supplier Philippines.

Name: Steel Tubular
Brand: Southend

Square and rectangular hollow sections in mild steel (A500 / SS400), black or galvanized, sold by outside dimensions in inches and wall thickness, standard 6.0m lengths. Weight formula: kg/m = [2t(a + b) − 4t²] × 0.00785.

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Bundle of square steel tubular sections — Southend Philippines — Illustrative image · © Southend · southend.ph

Sizes and weights

A500 / JIS SS400 · theoretical weights (sharp-corner formula)

Size (in)	Dims (mm)	Wall (mm)	kg/m	kg per 6.0 m
1 × 1	25 × 25	1	0.75	4.52
1 × 1	25 × 25	1.2	0.9	5.38
1 × 1	25 × 25	1.5	1.11	6.64
1 × 1	25 × 25	2	1.44	8.67
1-1/2 × 1-1/2	38 × 38	1.2	1.39	8.33
1-1/2 × 1-1/2	38 × 38	1.5	1.72	10.31
1-1/2 × 1-1/2	38 × 38	2	2.26	13.57
2 × 2	50 × 50	1.2	1.84	11.04
2 × 2	50 × 50	1.5	2.28	13.7
2 × 2	50 × 50	2	3.01	18.08
1 × 2	25 × 50	1.2	1.37	8.22
1 × 2	25 × 50	1.5	1.7	10.18
1 × 2	25 × 50	2	2.23	13.37
1 × 3	25 × 75	1.5	2.28	13.7
1 × 3	25 × 75	2	3.01	18.08
2 × 3	50 × 75	1.5	2.87	17.24
2 × 3	50 × 75	2	3.8	22.79
2 × 4	50 × 100	1.5	3.46	20.77
2 × 4	50 × 100	2	4.58	27.5

Weights are theoretical (sharp-corner formula at 7.85 g/cm³). Real tube has rounded corners and gauge tolerance, so actual weight runs a few percent off — more at thicker walls. Exact weight is confirmed on your quote.

Steel tubular sizes and weights chart — square and rectangular tube, kg per meter — Southend Philippines — Free to save or share. © Southend · southend.ph

Grades

A500 / JIS SS400 mild steel, black or galvanized; walls 0.8–2.0mm common, up to ~4.0mm by order.

How it's sold

Sold per 6.0m length by size, wall and finish (black or GI). Send your list — spec sheet, drawing or BOQ — and we quote it back the same day.

Where it's used

Gates, railings, posts and canopies — clean welded work in square and rectangular tube.

Where steel tube is used — gates, railings, columns, space frames, carports, furniture — Southend Philippines — Free to save or share. © Southend · southend.ph

Common questions

Square vs rectangular tube?

Both are hollow sections sold by outside dimensions and wall. Used for frames, railings, gates, trusses, furniture and canopies.

Are these weights exact?

They are theoretical. Supplier tables differ a few percent because of rounded corners and coil gauge tolerance; we confirm actual weight per brand on the quote.

What is the tube weight formula?

kg/m = [2 × t × (a + b) − 4 × t²] × 0.00785, with outside dims a, b and wall t in mm.

Specs reviewed July 2026 · Southend Construction & Industrial Supplies, Dasmariñas, Cavite