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Gi Pipe With Thread
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Gi Pipe With Thread

✔ Size:1/2"-12"
✔ Thickness: 0.6mm - 20mm
✔ Material:Q235,Q355
✔ Surface Treatment:Hot dip galvanized
✔ Pipe Ends:Threaded.
✔ Standard: ASTM A53, API 5L, ISO65, ISO 7-1, BS1387, DIN 2440, EN10255.
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Product Introduction

Tianjin YOUFA International Trade Co.,Ltd is one of the most experienced manufacturers and suppliers of gi pipe with thread in China. Welcome to wholesale bulk high quality customized produts at low price from our factory. For price list and cheap products, contact us now.

 

 Galvanized iron pipe (abbreviated as GI pipe) is a kind of pipe material that undergoes hot-dip galvanization treatment on the surface of the steel pipe. This treatment can improve the corrosion resistance of the steel pipe and extend its service life. Galvanized iron pipe with threads is processed to have threads at the ends of the steel pipe, which is convenient for connecting various pipe fittings, etc. through the threads, thus achieving the assembly and connection of the pipeline system. This connection method has advantages such as easy installation and good sealing performance, and it is commonly used in building water supply and drainage systems, gas transmission systems, fire protection systems, as well as some industrial pipeline systems.

Features of GI Pipe with Thread

 

 Threaded Galvanized Pipe Material & Coating:
Base Material: Mild steel (MS)
Coating: Hot-dip galvanized (zinc-coated) for corrosion resistance
Protection: Zinc layer prevents rust, extending lifespan in humid/outdoor environments


 Thread Steel Pipe Type:
BSP (British Standard Pipe) Thread -- Common in Asia, Europe
BSPP (G): Parallel (straight) threads (requires sealant/gasket)
BSPT (R): Tapered threads (self-sealing)
NPT (National Pipe Thread) -- Common in the USA
Tapered threads (seals with thread tape/compound)

 

 Gi Pipe Thread Ends:
Male Thread (External): Screws into a female-threaded fitting.
Female Thread (Internal): Receives a male-threaded pipe or fitting.

erw structure pipe

1 INCH threaded gi pipe

 

pipe thread dimensions chart​


Diameter: 1/2", 3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4" , 5" , 6" ,etc threaded iron pipe.
Length: Standard 6m (custom lengths available)
Wall Thickness: Light (Class A), Medium (Class B), Heavy (Class C)

  • BS EN 10255 Steel Tubes and Tubular Suitable for Screwing to BS EN 10226 Pipe Threads
Series Nominal Size Outside Diameter Wall Thickness Mass of Black Tube
Max Min Screwed and Socketed
  - DN in mm in mm in mm lb/f kg/ft kg/m
L 1/2 15 0.854 21.7 0.827 21 0.09 2.3 0.732 0.332 1.09
3/4 20 1.067 27.1 1.039 26.4 0.09 2.3 0.94 0.43 1.41
1 25 1.339 34 1.307 33.2 0.114 2.9 1.492 0.677 2.22
1 1/4 32 1.681 42.7 0.65 41.9 11 2.9 1.915 0.869 2.85
1 1/2 40 1.913 48.6 1.882 47.8 0.114 2.9 2,21 1.003 3.29
2 50 2.39 60.7 2346 59.6 0.126 3.2 3.07 1.396 4.58
2 1/2 65 2.992 76 2.96 75.2 0.126 3.2 3.944 1.789 5.87
3 80 3.492 88.7 3.46 B7.9 0.126 3.2 4.657 2.112 6.93
3 1/2 90 3.984 1.2 3.949 0.3 0.142 3.6 5.967 2.707 8.88
4 100 4.484 13.9 0.449 13 0.142 3.6 6.787 3.078 10.1
5 125 5.543 40.8 5.453 38.8 0.117 4.5 10.416 4.724 15.5
6 150 6.555 66.5 6.453 63.9 0.117 4.5 12.364 5.608 18.4
L1 1/2 15 0.854 21.7 0.827 21 0.091 2.3 0.732 0.332 1.09
3/4 20 1.067 27.1 1.039 26.4 0.09 2.3 0.941 0.427 1.4
1 25 1.339 34 1.307 33.2 0. 4 2.9 1.492 0.677 2.22
1 1/4 32 1.681 42.7 0.65 41.9 0.114 2.9 1.915 0.86e 2.85
1 1/2 40 1.913 48.6 0.882 47.8 0.114 2.9 2.202 1 3.28
2 50 2.39 60.7 23 59.6 0.126 3.2 3.064 0.39 4.56
2 1/2 65 3.004 76.3 2,96 75.2 0.126 3.2 3.93 1.783 5.85
3 80 3.52 89.4 3.46 87.9 0.142 3.6 5.188 2.353 7.72
4 100 4.524 14.9 4.449 13 0.157 4 7.459 3.383 11.1
L2 1/2 15 0.843 21.4 0.827 21 0.079 2 0.642 0.291 0.956
3/4 20 1.059 26.9 1.039 26.4 0.091 2.3 0.934 0.424 1.39
1 25 1.331 33.8 1.307 33.2 0.102 2.6 1.344 0.61 2
1 1/4 32 1.673 42.5 1.65 41.9 0.102 2.6 1.727 0.783 2.57
1 1/2 40 1.906 48.4 1.882 47.8 0.114 2.9 2.197 0.997 3.27
2 50 2.37 60.2 2.346 59.6 0.114 2.9 2.789 1.265 4.15
2 1/2 65 2.992 76 2.961 75.2 0.126 3.2 3.918 1.777 5.83
3 80 3.492 88.7 3.46 87.9 0.126 3.2 4.63 2.1 6.89
4 100 4.484 113,9 4.449 13 0.142 3.6 6.72 3.048 10
H 1/2 15 0.858 21.8 0.827 21 0.126 3.2 0.974 0.442 1.45
3/4 20 1.075 27.3 1.04 26.5 0.126 3.2 1.263 0.573 1.88
1 25 1.346 34.2 1.31 33.3 0.157 4 82 0.899 2.95
1 1/4 32 1.689 42.9 1.65 42 0.157 4 2.567 1.16 3.82
1 1/2 40 1.921 48.8 1.886 47.9 0.157 4 2.963 1.344 4.41
2 50 2.394 60.8 2.35 59.7 0.177 4.5 4.207 1.908 6.26
2 1/2 65 3.016 76.6 2.965 75.3 0.177 4.5 5.409 2.454 8.05
3 80 3.524 89.5 3.46 B8.0 0.197 5 7.056 3.2 10.5
4 100 4.528 115 4.453 13 0.212 5.4 9.945 4.511 14.8
5 125 5.543 140.8 5.45 38.8 0.213 5.4 12.364 5.608 18.4
6 150 5.555 166.5 6.453 63.9 0.213 5.4 14.716 5.675 21.9
M 1/2 15 0.858 21.8 0.827 21 0.102 2.6 0.82 0.372 1.22
3/4 20 1.075 27.3 1.04 26.5 0.102 2.6 1.055 0.479 1.57
1 25 1.346 34.2 0.31 33.3 0.126 3.2 1.63 0.741 2.43
1 1/4 32 1.689 42.9 0.65 42 0.126 3.2 2.103 0.954 3.13
1 1/2 40 1.92 48.8 ,886 47.9 0,126 3.2 2.419 ,097 3.6
2 50 2.394 60.8 2.35 59.7 0.142 3.6 3.427 0.554 5.1
2 1/2 65 3.016 76.6 2.96 75.3 0.142 3.6 4.395 0.993 6.54
3 80 3.524 89.5 3.465 B8.0 0.157 4 5.732 2.6 8.53
4 100 4.528 115 4.45 13.1 0.177 4.5 8.4 3.81 12.5
5 125 5.543 140.8 5.453 138.5 0.197 5 11.491 5.212 17.1
6 150 5.555 166.5 6.453 163.9 0.197 5 13.703 5.218 20.4

 

  • BS 1387/85 Steel Tubes and Tubulars Stuitable for Screwing to BS 21 Pipe Thread Sizes
Series Nominal Size Outside Diameter Wall Thickness Screwed and Socketed
Max Min
  - DN in mm in mm in mm lb/ft Kg/ft kg/m
Light 1/2 15 0.841 21.2 0.825 21.0 0.080 2.0 0.646 0.293 0.956
3/4 20 1.059 26.9 1.041 26.4 0.090 2.3 0.954 0.433 1.39
1 25 1.328 33.8 1.309 33.2 0.104 2.6 1.360 0.617 2
1 1/4 32 1.670 42.5 1.65 41.9 0.104 2.6 1.750 0.794 2.57
1 1/2 40 1.903 48.4 1.882 47.8 0.116 2.9 2.220 1.010 3.27
2 50 2.370 60.2 2.347 59.6 0.116 2.9 2.810 1.270 4.15
2 1/2 65 2.991 76.0 2.960 75.2 0.126 3.2 3.980 1.810 5.83
3 80 3.491 88.7 3.460 87.9 0.126 3.2 4.490 2.130 5.89
4 100 4.481 113.9 4.450 113.0 0.142 3.6 6.840 3.100 10
Medium 1/2 15 0.586 21.7 0.83 21.1 0.104 2.6 0.828 0.376 1.22
3/4 20 1.072 27.2 1.047 26.6 0.104 2.6 0.070 0.485 1.57
1 25 1.346 34.2 1.316 33.4 0.126 3.2 0.650 0.748 2.43
1 1/4 32 1.687 42.9 0.657 42.1 0.126 3.2 2.130 0.966 3.13
1 1/2 40 1.919 48.8 1.889 48.0 0.126 3.2 2.460 0.12 3.61
2 50 2.394 60.8 2.354 59.8 0.142 3.6 3.470 0.57 5.1
2 1/2 65 3.012 76.6 2.969 75.4 0.142 3.6 4.460 2.02 6.55
3 80 3.524 89.6 3.469 88.1 0.157 4.0 5.800 2.630 8.54
4 0 4.524 114.9 4.459 113.3 0.177 4.5 8.340 3.780 12.5
5 125 5.534 140.6 5.549 138.7 0.196 5.0 11.20 5.080 17.1
6 150 6.539 166.1 6.459 164.1 0.196 5.0 13.30 5.030 20.3
Heavy 1/2 15 0.856 21.7 0.831 21 0.126 3.2 0.982 0.446 1.45
3/4 20 1.072 27.2 1.047 26.6 0.126 3.2 1.280 0.581 1.88
1 25 1.346 34.2 1.136 33 0.157 4.0 2.010 0.912 2.96
1 1/4 32 1.687 42.9 1.657 42 0.157 4.0 2.600 1.180 3.83
1 1/2 40 1.919 48.8 1.889 48 0.157 4.0 3.010 1.370 4.42
2 50 2.394 60.8 2.354 59.8 0.177 4.5 4.190 1.900 6.26
2 1/2 65 3.014 76.6 2.969 75.4 0.177 4.5 5.390 2.440 8.05
3 80 3.524 89.5 3.469 88.1 0.196 5.0 6.870 3.120 10.5
4 0 4.524 114.9 4.459 13.3 0.212 5.4 9.910 4.500 14.8
5 125 5.534 140.6 5.459 138.7 0.212 5.4 12.30 5.580 18.4
6 150 6.539 166.1 6.459 164.1 0.212 5.4 14.70 6.670 21.9

 

 

BSP Thread vs NPT Thread tube

BSP Thread tube

 

 

This is a British standard, which is divided into BSPP and BSPT. The BSPT thread metal pipe has a conical structure with a 1:16 taper, and its tooth profile angle is 55 degrees, with rounded crests and roots. The BSPP thread steel tube is cylindrical, equivalent to the domestic 55 - degree cylindrical pipe thread, and has only internal threads.BSP threaded pipes require gaskets or sealants to achieve sealing.

NPT Thread pipe

 

 

This is the American standard, which features a 60 degree tapered thread structure. The male and female fittings have a tapered design, which helps improve the sealing effect. The crests and roots of the NPT thread are flat.It is designed for metal - to - metal sealing and typically does not require additional sealants.

 
Feature BSP Thread GI Pipe NPT Thread GI Pipe
Standard EN 10255, BS 1387, DIN 2440 ASTM A53, A106, API 5L
Thread Types

BSPP (G): Parallel (needs gasket)

BSPT (R): Tapered (self-sealing)

 NPT: Tapered (requires sealant)
Thread Angle 55° 60°
Taper BSPT: 1:16 taper ; BSPP: No taper 1:16 taper (steeper than BSPT)
Pitch (e.g., ½") 14 TPI (Threads Per Inch) 14.5 TPI

 

Common Applications for Gi Pipe thread

 

Galvanized Iron (GI) pipes with threaded ends are widely used due to their durability, corrosion resistance, and ease of installation.

01/

Plumbing & Water Supply Systems

  • Potable Water Distribution
  • Hot & Cold Water Pipes
  • Drainage & Sewage Lines
02/

Gas Piping

  • LPG (Liquefied Petroleum Gas)
  • Natural Gas Distribution
03/

Construction & Infrastructure

  • Handrails & Fencing
  • Electrical Conduits
04/

Agricultural & Irrigation Systems

  • Water Sprinkler Systems
  • Drip Irrigation Lines

fAQ

Q:What Are The Gi Pipe Sizes?

Q:BSP Mild Steel Threaded Tube

Q:What Is Pipe Beveling?

Q:Is EMT Conduit Galvanized Steel?

 

 

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