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Hot-dip galvanized (HDG) steel pipe: black pipe dipped in molten zinc for a thicker coating than GI pipe, so it resists rust and lasts for years in water supply systems. Yellow stripe Class S, blue stripe Class M and TIS 276-2562 threaded pipe, 1/2–6 in, at factory prices with delivery across Thailand.
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What is hot-dip galvanized (HDG) pipe?
HDG pipe is black steel pipe that is dipped in molten zinc after forming. The zinc layer is far thicker than on GI pipe and covers both the inside and the outside, so the pipe resists rust and lasts for years.
Why choose HDG for water lines
- Water supply systems: choose HDG. It lasts longer and doesn't need replacing often.
- Temporary or garden water lines: GI pipe works, but it doesn't last. For anything permanent, HDG is the better buy.
- Posts and tent frames: GI is the budget option; HDG costs more but lasts longer.
HDG pipe types
Type | Sizes | Wall | Standard |
|---|---|---|---|
Yellow stripe Class S, threaded | 1/2–4 in | 1.5–2.5 mm | - |
Blue stripe Class M, threaded | 1/2–6 in | 1.8–3.2 mm | - |
Blue stripe TIS, threaded | 1/2–6 in | 2.6–5 mm | TIS 276-2562 |
Today's HDG pipe prices
Item | Wall | Price (THB) |
|---|---|---|
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 1/2 in | 1.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 1/2 in | 1.5 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 3/4 in | 1.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 3/4 in | 1.5 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 1 in | 2.3 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 1 in | 1.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 1.25 in | 2.3 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 1.25 in | 1.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 1.5 in | 2.3 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 1.5 in | 1.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 2 in | 2.3 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 2 in | 1.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 2.5 in | 2.5 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 2.5 in | 2 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 3 in | 2.8 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 3 in | 2.3 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 4 in | 3 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Yellow Stripe Class S Threaded Ends 4 in | 2.5 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 5 in | 3.2 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Class M Threaded Ends 6 in | 3.2 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 1/2 in TIS 276-2562 | 2.6 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 3/4 in TIS 276-2562 | 2.6 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 1 in TIS 276-2562 | 3.2 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 1.25 in TIS 276-2562 | 3.2 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 1.5 in TIS 276-2562 | 3.2 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 2 in TIS 276-2562 | 3.6 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 2.5 in TIS 276-2562 | 3.6 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 3 in TIS 276-2562 | 4 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 4 in TIS 276-2562 | 4.5 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 5 in TIS 276-2562 | 5 mm | |
Hot-Dip Galvanized (HDG) Steel Pipe Blue Stripe Threaded Ends 6 in TIS 276-2562 | 5 mm |
GI vs HDG pipe
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 |
FAQ
Does HDG pipe come with a TIS certificate?
Yes. TIS 276-2562 covers HDG pipe for water systems, with plain or threaded ends.
Can I order HDG box section, channel or beam?
Most box section sold is GI. Genuine HDG box, channel, rail or beam is made to order: the black steel is sent to a galvanizing plant, so tell our team exactly what you need.
Check today's price and order at OneStockHome with delivery across Thailand.
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