GI Galvanized Steel Pipes

GI galvanized round steel pipe formed from pre-galvanized (zinc-coated) coil, a lower-cost option than hot-dip galvanized (HDG) pipe. Red stripe plain-end, yellow Class S and blue Class M threaded pipe, plus plain-end TIS 107-2566 structural pipe for posts, tents and fences. For long-term water lines, choose HDG pipe. Factory prices, delivery across Thailand.

13 products Buying guide →

Pre Zinc GI Round Steel Pipes 1/2 inch

Pre Zinc GI Round Steel Pipes 3/4 inch

Pre Zinc GI Round Steel Pipes 1 inch

Pre Zinc GI Round Steel Pipes 1 1/4 inch

Pre Zinc GI Round Steel Pipes 1 1/2 inch

Pre Zinc GI Round Steel Pipes 2 inch

Pre Zinc GI Round Steel Pipes 2 1/2 inch

Pre Zinc GI Round Steel Pipes 3 inch

Pre Zinc GI Round Steel Pipes 4 inch

Steel Round Pipe GI TKS

Ziga Pre-Zinc GI Color Stripe Round Pipes

List of all GI Galvanized Steel Pipes products

found 13 item(s)Show products without price

found 13 item(s)

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Round Pipe 1/2 inch Round Pipe 3/4 inch Round Pipe 1 inch Round Pipe 1 1/4 inch Round Pipe 1 1/2 inch Round Pipe 2 inch Round Pipe 2 1/2 inch Round Pipe 3 inch

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GI Galvanized Steel Pipe 1.5 in, 6 m

(1)5 Options

Options

Red Stripe Plain Ends, 1.5 in, 1.4 mm thick฿255 Yellow Stripe Class S Threaded Ends, 1.5 in, 1.7 mm thick฿352 Blue Stripe Class M Threaded Ends, 1.5 in, 2 mm thick฿376 All 5

From฿ 255.14/ Pieces

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GI Galvanized Steel Pipe Yellow Stripe Threaded Ends, 6 m

9 Options

Colour

Options

Yellow Stripe Class S Threaded Ends, 1/2 in, 1.4 mm thick฿123 Yellow Stripe Class S Threaded Ends, 3/4 in, 1.4 mm thick฿158 Yellow Stripe Class S Threaded Ends, 1 in, 1.6 mm thick฿227 All 9

From฿ 123.36/ Pieces

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GI Galvanized Steel Pipe Red Stripe Plain Ends, 6 m

6 Options

Colour

Options

Red Stripe Plain Ends, 1/2 in, 1.4 mm thick฿112 Red Stripe Plain Ends, 3/4 in, 1.4 mm thick฿142 Red Stripe Plain Ends, 1 in, 1.4 mm thick฿179 All 6

From฿ 112.15/ Pieces

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GI Galvanized Steel Pipe 2 in, 6 m

5 Options

Options

Red Stripe Plain Ends, 2 in, 1.4 mm thick฿322 Yellow Stripe Class S Threaded Ends, 2 in, 1.7 mm thick฿434 Blue Stripe Class M Threaded Ends, 2 in, 2 mm thick฿461 All 5

From฿ 322.43/ Pieces

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GI Galvanized Steel Pipe Blue Stripe Threaded Ends, 6 m

(1)9 Options

Colour

Options

Blue Stripe Class M Threaded Ends, 1/2 in, 1.8 mm thick฿150 Blue Stripe Class M Threaded Ends, 3/4 in, 1.8 mm thick฿192 Blue Stripe Class M Threaded Ends, 1 in, 1.8 mm thick฿257 All 9

From฿ 149.53/ Pieces

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GI Galvanized Steel Pipe 3 in, 6 m

4 Options

Options

Yellow Stripe Class S Threaded Ends, 3 in, 2.1 mm thick฿796 Blue Stripe Class M Threaded Ends, 3 in, 2.5 mm thick฿907 3.2 mm thick, TIS฿1,063 All 4

From฿ 796.00/ Pieces

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GI Galvanized Steel Pipe 1 in, 6 m

(2)3 Options

Options

Red Stripe Plain Ends, 1 in, 1.4 mm thick฿179 Yellow Stripe Class S Threaded Ends, 1 in, 1.6 mm thick฿227 Blue Stripe Class M Threaded Ends, 1 in, 1.8 mm thick฿257

From฿ 178.97/ Pieces

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GI Galvanized Steel Pipe 1/2 in, 6 m

3 Options

Options

Red Stripe Plain Ends, 1/2 in, 1.4 mm thick฿112 Yellow Stripe Class S Threaded Ends, 1/2 in, 1.4 mm thick฿123 Blue Stripe Class M Threaded Ends, 1/2 in, 1.8 mm thick฿150

From฿ 112.15/ Pieces

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GI Galvanized Steel Pipe 1.25 in, 6 m

3 Options

Options

Red Stripe Plain Ends, 1.25 in, 1.4 mm thick฿227 Yellow Stripe Class S Threaded Ends, 1.25 in, 1.6 mm thick฿287 Blue Stripe Class M Threaded Ends, 1.25 in, 2 mm thick฿323

From฿ 227.10/ Pieces

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GI Galvanized Steel Pipe 2.5 in, 6 m

(1)3 Options

Options

Yellow Stripe Class S Threaded Ends, 2.5 in, 2 mm thick฿601 Blue Stripe Class M Threaded Ends, 2.5 in, 2.3 mm thick฿658 3.2 mm thick฿937

From฿ 600.93/ Pieces

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GI Galvanized Steel Pipe 3/4 in, 6 m

(1)3 Options

Options

Red Stripe Plain Ends, 3/4 in, 1.4 mm thick฿142 Yellow Stripe Class S Threaded Ends, 3/4 in, 1.4 mm thick฿158 Blue Stripe Class M Threaded Ends, 3/4 in, 1.8 mm thick฿192

From฿ 141.59/ Pieces

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GI Galvanized Steel Pipe 4 in, 6 m

(1)4 Options

Options

2.3 mm thick, TIS฿1,024 Blue Stripe Class M Threaded Ends, 4 in, 2.5 mm thick฿1,192 3.2 mm thick, TIS฿1,439 All 4

From฿ 1,024.30/ Pieces

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GI Galvanized Steel Pipe 6 in, 6 m

2 Options

Options

2.5 mm thick฿1,762 3.2 mm thick฿2,167

From฿ 1,761.68/ Pieces

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Download Catalog

Steel Round Pipe AS1163 Steel Round Pipe JIS G3466 Steel Round Pipe TIS107 Steel Round Pipe BS1139 Steel Round Pipe BS EN10219 Steel Round Pipe ASTM A500

Questions

No question available

What is GI galvanized pipe?

GI galvanized pipe is round steel pipe formed from pre-galvanized (zinc-coated) coil: the coated strip is slit, rolled into a tube and welded, and the weld seam is sprayed with zinc. The zinc layer is thinner than on hot-dip galvanized (HDG) pipe, so GI costs less. It is the go-to galvanized steel pipe for posts, tent frames, fences, railings and light structures. We stock 1/2–6 in, 1.4–3.2 mm wall, 6 m lengths.

GI vs HDG pipe: what's the difference?

Thailand has two kinds of galvanized pipe, so say which one you need before you order. GI pipe is formed from zinc-coated coil. HDG pipe is formed from black coil and then dipped in a zinc bath. GI has the thinner coating and lower price; HDG lasts longer.

	GI pipe	HDG pipe
How it's made	Pre-galvanized (zinc-coated) coil formed into pipe	Black steel pipe hot-dip galvanized after forming
Zinc layer	Thinner	Thicker, inside and outside
Price	Lower	Higher
TIS standard	TIS 107-2566 structural pipe (plain ends)	TIS 276-2562 water pipe (plain and threaded ends)
Best for	Posts, tent frames, fences, structures, temporary work	Water supply systems, outdoor work, long service life

Can GI pipe be used for water lines?

For temporary use, yes, but it isn't recommended for a water system you'll rely on for years.

Water supply systems: choose HDG pipe. It lasts longer and doesn't need replacing often.
A little garden watering or a temporary line: GI works, but it won't last. Fine if you'll remove it later.
Posts and tent frames: GI is the budget-friendly choice and does the job well.

GI pipe types

Type	Sizes	Wall	Best for
Red stripe, plain ends	1/2–2 in	1.4 mm	Handrails, fences, light-duty work
Yellow stripe Class S, threaded	1/2–3 in	1.4–2.1 mm	Tent frames, scaffolding, temporary water lines
Blue stripe Class M, threaded	1/2–4 in	1.8–2.5 mm	Posts, structures, tent frames
Plain ends, thick wall	1.5–2.5 in	2.3–3.2 mm	Structures, posts, roof frames
Plain ends, TIS 107-2566	3–6 in	2.3–3.2 mm	Structural work that calls for TIS pipe

The colored stripe marks the wall class: red is the thinnest and can't be threaded, yellow Class S is thicker and factory-threaded, and blue Class M is thicker again.

Does GI pipe have a TIS standard?

Only plain-end round GI pipe, under TIS 107-2566, which is a structural pipe standard rather than a water pipe standard. Water pipe is covered by TIS 276-2562, which is HDG pipe; see HDG pipe TIS 276-2562.

Today's GI pipe prices

Item	Wall	Price (THB)
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 1/2 in	1.8 mm	149.53
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 1/2 in	1.4 mm	123.36
GI Galvanized Steel Pipe Red Stripe Plain Ends 1/2 in	1.4 mm	112.15
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 3/4 in	1.8 mm	192.06
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 3/4 in	1.4 mm	157.94
GI Galvanized Steel Pipe Red Stripe Plain Ends 3/4 in	1.4 mm	141.59
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 1 in	1.8 mm	257.01
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 1 in	1.6 mm	227.1
GI Galvanized Steel Pipe Red Stripe Plain Ends 1 in	1.4 mm	178.97
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 1.25 in	2 mm	323.36
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 1.25 in	1.6 mm	286.92
GI Galvanized Steel Pipe Red Stripe Plain Ends 1.25 in	1.4 mm	227.1
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 1.5 in	2 mm	375.7
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 1.5 in	1.7 mm	352.34
GI Galvanized Steel Pipe Red Stripe Plain Ends 1.5 in	1.4 mm	255.14
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 2 in	2 mm	460.75
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 2 in	1.7 mm	433.64
GI Galvanized Steel Pipe Red Stripe Plain Ends 2 in	1.4 mm	322.43
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 2.5 in	2.3 mm	661.68
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 2.5 in	2 mm	600.93
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 3 in	2.5 mm	906.54
GI Galvanized Steel Pipe Yellow Stripe Class S Threaded Ends 3 in	2.1 mm	800.0
GI Galvanized Steel Pipe Blue Stripe Class M Threaded Ends 4 in	2.5 mm	1191.59
GI Galvanized Steel Pipe Plain Ends 1.5 in (OD 48.6 mm)	2.3 mm	408.41
GI Galvanized Steel Pipe Plain Ends 1.5 in	3.2 mm	588.79
GI Galvanized Steel Pipe Plain Ends 2 in (OD 60.5 mm)	2.3 mm	500.93
GI Galvanized Steel Pipe Plain Ends 2 in	3.2 mm	702.8
GI Galvanized Steel Pipe Plain Ends 2.5 in	3.2 mm	937.38
GI Galvanized Steel Pipe Plain Ends 3 in TIS 107-2566	2.3 mm	752.34
GI Galvanized Steel Pipe Plain Ends 3 in TIS 107-2566	3.2 mm	1062.62
GI Galvanized Steel Pipe Plain Ends 4 in TIS 107-2566	2.3 mm	1024.3
GI Galvanized Steel Pipe Plain Ends 4 in TIS 107-2566	3.2 mm	1439.25
GI Galvanized Steel Pipe Plain Ends 6 in TIS 107-2566	2.5 mm	1761.68
GI Galvanized Steel Pipe Plain Ends 6 in TIS 107-2566	3.2 mm	2167.29

Caring for GI pipe

Cut ends, welds and threads lose their zinc and rust first. Touch them up with zinc-rich or anti-rust paint after cutting or welding, and paint pipe that sits outdoors or near the sea.

Buy GI pipe at OneStockHome

Factory prices on every size and wall thickness, with delivery across Thailand. Not sure whether you need GI or HDG? Our team will check the spec with you before you order.