Stainless steel pipe dimensions chart: standard sizes, wall thickness, weight & tolerances

Date:2026-07-15View:2Tags:stainless steel pipe dimensions chart, stainless steel pipe sizes, SS pipe dimensions

Stainless steel pipes are widely used in industries where corrosion resistance, strength, and long-term reliability are essential. From chemical processing and food production to oil & gas, power generation, pharmaceuticals, and water treatment, selecting the correct pipe dimensions, wall thickness, and schedule directly affects system safety, pressure performance, and installation costs.

 

This guide provides a comprehensive stainless steel pipe dimensions chart, including nominal pipe sizes (NPS), outside diameter (OD), wall thickness, weight, and dimensional tolerances based on ASME B36.19. It also explains the differences between ASME B36.10 and ASME B36.19, introduces common ASTM material grades, and summarizes the dimensional tolerances required for seamless and welded stainless steel pipes.

 Stainless steel pipes

Stainless Steel Pipe Dimension Standards

Most stainless steel pipe dimensions follow ASME B36.19M, the internationally recognized standard for stainless steel piping. Carbon steel and alloy steel pipes are generally manufactured according to ASME B36.10M.

The standard defines:

Nominal Pipe Size (NPS)

Outside Diameter (OD)

Wall Thickness

Pipe Schedule (Sch 5S–XXS)

Weight per meter or per foot

Manufacturing tolerances

Using standardized dimensions allows stainless steel pipes from different manufacturers to remain interchangeable while ensuring compatibility with valves, fittings, and flanges.

 

Stainless Steel Pipe Dimensions Chart (Metric)

Nominal Bore (NB)

Outside Diameter (mm)

Sch-5S

Sch-10S

Sch-40S

Sch-80S

Sch-160S

Sch-XXS

mm

inch

WT (mm)

Weight (Kg/m)

WT (mm)

Weight (Kg/m)

WT (mm)

Weight (Kg/m)

WT (mm)

Weight (Kg/m)

WT (mm)

Weight (Kg/m)

WT (mm)

Weight (Kg/m)

3

1/8

10.3

1.24

0.276

1.24

0.28

1.73

0.37

2.41

0.47

-

-

-

-

6

1/4

13.7

1.24

0.390

1.65

0.49

2.24

0.631

3.02

0.80

-

-

-

-

10

3/8

17.1

1.24

0.490

1.65

0.63

2.31

0.845

3.20

1.10

-

-

-

-

15

1/2

21.3

1.65

0.800

2.11

1.00

2.77

1.27

3.75

1.62

4.75

1.94

7.47

2.55

20

3/4

26.7

1.65

1.03

2.11

1.28

2.87

1.68

3.91

2.20

5.54

2.89

7.82

3.63

25

1

33.4

1.65

1.30

2.77

2.09

3.38

2.50

4.55

3.24

6.35

4.24

9.09

5.45

32

1 1/4

42.2

1.65

1.65

2.77

2.70

3.56

3.38

4.85

4.47

6.35

5.61

9.70

7.77

40

1 1/2

48.3

1.65

1.91

2.77

3.11

3.68

4.05

5.08

5.41

7.14

7.25

10.16

9.54

50

2

60.3

1.65

2.40

2.77

3.93

3.91

5.44

5.54

7.48

8.74

11.1

11.07

13.44

65

2 1/2

73.0

2.11

3.69

3.05

5.26

5.16

8.63

7.01

11.4

9.53

14.9

14.2

20.39

80

3

88.9

2.11

4.51

3.05

6.45

5.49

11.30

7.62

15.2

11.1

21.3

15.24

27.65

100

4

114.3

2.11

5.84

3.05

8.36

6.02

16.07

8.56

22.3

13.49

33.54

17.12

41.03

125

5

141.3

2.77

9.47

3.40

11.57

6.55

21.8

9.53

31.97

15.88

49.11

19.05

57.43

150

6

168.3

2.77

11.32

3.40

13.84

7.11

28.3

10.97

42.7

18.2

67.56

21.95

79.22

200

8

219.1

2.77

14.79

3.76

19.96

8.18

42.6

12.7

64.6

23.0

111.2

22.23

107.8

250

10

273.1

3.40

22.63

4.19

27.78

9.27

60.5

12.7

96.0

28.6

172.4

25.40

155.15

300

12

323.9

3.96

31.25

4.57

36.00

9.52

73.88

12.7

132.0

33.32

238.76

25.40

186.97

350

14

355.6

3.96

34.36

4.78

41.3

11.13

94.59

19.05

158.08

35.71

281.70

-

-

400

16

406.4

4.19

41.56

4.78

47.29

12.7

123.30

21.41

203.33

40.46

365.11

-

-

450

18

457.2

4.19

46.80

4.78

53.42

14.27

155.80

23.8

254.36

45.71

466.40

-

-

500

20

508.0

4.78

59.25

5.54

68.71

15.09

183.42

26.19

311.2

49.99

564.68

-

-

600

24

609.6

5.54

82.47

6.35

94.45

17.48

255.41

30.96

442.08

59.54

808.22

-

-

 

Stainless Steel Pipe OD Chart (Inches with Wall Thickness & Weight per Foot)

NPS (inch)

OD (in)

5s

5

10s

10

20

30

40s & Std.

40

60

80s & E.H.

80

100

120

140

160

DBL E.H.

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

WT

W

 

 

8

8.625

.109

9.914

.109

9.914

.148

13.40

.148

13.40

.250

22.36

.277

24.70

.322

28.55

.322

28.55

.406

35.64

.500

43.39

.500

43.39

.593

50.87

.718

60.93

.812

67.76

.906

74.69

.885

72.42

10

10.750

.134

15.19

.134

15.19

.165

18.65

.165

18.70

.250

28.04

.307

34.24

.365

40.48

.365

40.48

.500

54.74

.500

54.74

.500

54.74

.593

64.33

.718

76.93

.843

89.20

1.000

104.10

1.125

115.70

12

12.750

.156

21.07

.165

22.18

.180

24.16

.180

24.20

.250

33.38

.330

43.77

.375

49.56

.406

53.53

.562

73.16

.500

65.42

.500

65.42

.687

88.51

.843

107.20

1.000

125.50

1.125

139.70

1.312

160.3

14

14.000

.156

23.07

-

-

.188

27.73

-

-

.250

36.71

.312

45.38

.375

54.57

.375

54.57

.437

63.37

.593

84.91

.500

72.09

.750

106.10

.937

130.70

1.093

150.70

1.250

170.20

1.406

189.10

16

16.000

.165

27.90

-

-

.188

31.75

-

-

.250

42.05

.312

52.36

.375

62.58

.375

62.58

.500

82.77

.656

107.50

.500

82.77

.843

136.50

1.031

164.80

1.218

192.30

1.427

223.50

1.593

245.10

18

18.000

.165

31.43

-

-

.188

35.76

-

-

.250

47.39

.312

59.03

.437

82.06

.375

70.59

.562

104.20

.750

138.20

.500

93.45

.937

170.80

1.156

208.00

1.375

244.10

1.562

274.20

1.781

308.50

20

20.000

-

-

.188

39.78

-

-

.218

46.05

.250

52.73

.375

78.60

.500

104.10

.375

78.60

.593

122.90

.812

166.40

.500

104.10

1.031

208.90

1.280

256.10

1.500

296.40

1.750

341.10

1.968

379.00

24

24.000

-

-

.218

55.37

-

-

.250

63.41

.250

63.41

.375

94.62

.562

140.80

.375

94.62

.687

171.20

.968

238.10

.500

125.50

1.218

296.40

1.531

367.40

1.812

429.40

2.062

483.10

2.344

542.13

Note: Entries are shown as Wall Thickness (inches) / Weight (lb/ft). Data per ANSI B36.19 and related standards. “-” indicates schedule not available for that size.Note: Entries are shown as Wall Thickness (inches) / Weight (lb/ft). Data per ANSI B36.19 and related standards. “-” indicates schedule not available for that size.

 

ASME B36.10 vs ASME B36.19 – Core Difference

NPS

Sch 40S Stainless Steel (mm)

Sch 40 Carbon Steel (mm)

Difference

10

9.27

12.70

–27%

12

9.53

12.70

–25%

14

9.53

12.70

–25%

 

Common Stainless Steel Pipe Materials (Grades per ASTM A312)

Grade

Type

Key Characteristics

TP304 / 304L

Austenitic

Most common; general corrosive service

TP304H

High-Temp

Modified TP304 for creep resistance

TP316 / 316L

Austenitic

Molybdenum added; better chloride resistance

TP316H

High-Temp

Modified TP316 for creep resistance

TP321 / 321H

Stabilized

Titanium-stabilized; good for welding

TP347 / 347H

Stabilized

Niobium-stabilized; high-temperature strength

TP309H / TP310H

High-Temp

Higher chromium/nickel; extreme heat resistance

 

Dimension Tolerances per ASTM A312

ASTM A312 covers seamless, welded, and heavily cold worked austenitic stainless steel pipe. The “H” grades (e.g., TP304H, TP316H, TP321H, TP347H) are modified for high-temperature service where creep and stress rupture properties are important.

Dimension

Tolerance

Notes

Outside Diameter (OD)

Varies by size; typically ±0.031″ for 1-1/2″ to 4″ NPS

Tighter tolerances apply for smaller sizes under ASTM A269/A213

Wall Thickness

Seamless: -12.5% under nominal wall thickness

Per ASME SA999

Length

Random lengths normally ordered

Specific tolerances apply per ASTM A530

Out-of-Roundness

Not to exceed specified limits

Varies by NPS

 

ASTM Specification & Tolerances for SS Tubing

Specification

Allowable Outside Diameter

Allowable Wall

Exact Length

Testing

Nominal Diameter

Over

Under

%Over

%Under

Over

Under

Variation in mm

 

 

Thickness Variation

 

Tolerance in mm

ASTM-A213
(Seamless Boiler, Superheater, Heat Exchanger Tubes)

Under 25.4

0.1016

0.1016

+20

0

3.175

0

Tension Test

25.4-38.1 incl

0.1524

0.1524

+22

0

3.175

0

Flare Test

38.1-50.8 excl

0.2032

0.2032

+22

0

3.176

0

Hardness Test

50.8-63.5 excl

0.254

0.254

+22

0

4.46

0

 

63.5-76.2 excl

0.3048

0.3048

+22

0

4.76

0

100% Hydrostatic test

76.2-101.6 incl

0.381

0.381

+22

0

4.76

0

Refer to ASTM A-450

 

ASTM-A249
(Welded Boiler, Superheater, Heat Exchanger, Condenser Tubes)

Under 25.4

0.1016

0.1016

+10

-10

3.175

0

 

 

25.4-38.1 incl

0.1524

0.1524

+10

-10

3.175

0

Tension Test

 

38.1-50.8 Excl

0.2032

0.2032

+10

-10

3.175

0

Flattening Test

 

50.0-63.5 excl

0.254

0.254

+10

-10

4.762

0

Flange Test

 

63.5-76.2 excl

0.3848

0.3048

+10

-10

4.762

0

Reverse Bend Test

 

76.2-101.6 incl

0.381

0.381

+10

-10

4.762

0

Hardness Test

 

 

 

ASTM-A249 (cont.)
(Minimum Wall tubes)

Minimum Wall tubes, + 18% 0 available, On request

 

 

 

 

100% Hydrostastic Test

 

 

 

 

 

 

Refer to ASTM A-450

 

 

ASTM-A269
(Seamless & Welded Tubing for General Service)

Untp 12.7

0.13

0.13

+15

-15

3.2

0

Flare Test (Seamless Only)

 

12.7-38.1 excl

0.13

0.13

+10

-10

3.2

0

Flange Test (Welded Only)

 

38.1-88.9 excl

0.25

0.25

+10

-10

4.8

0

Hardness Test

 

88.9-139.7 excl

0.38

0.38

+10

-10

4.8

0

Reverse Flattening Test

 

139.7-203.2 excl

0.76

0.76

+10

-10

4.8

0

(Welded only)

 

 

100% Hydrostatic Test

 

 

Refer to ASTM-A269

 

ASTM-A270
(Seamless & Welded Sanitary Tubing)

25.4

0.05

0.20

+10.0

-10.0

3.2

0

 

 

38.1

0.05

0.20

+10.0

-10.0

3.2

0

Reverse flattening Test

 

50.8

0.05

0.28

+10.0

-10.0

3.2

0

100% Hydrostastic Test

 

60.5

0.05

0.28

+10.0

-10.0

3.2

0

External' polish on all tubes

 

ASTM-A270 (cont.)

76.2

0.08

0.30

+10.0

-10.0

3.2

0

Refer to ASTM A-270

 

101.6

0.08

0.38

+10.0

-10.0

4.8

0

 

 

3.175-38.1 incl

0.4

0.79

Minimum Wall

6.4

0

 

 

38.1-1016 incl

0.79

0.79

12.5% under

6.4

0

Tension Test

 

ASTM-A312
(Seamless & Welded Pipe)

101.6-203.2 incl

1.59

0.79

nominal wall

 

6.4

0

Flattening Test

 

 

 

 

Specified

 

 

 

100% Hydrostatic Test

 

 

 

 

 

 

 

(Normally Random

Refer to ASTM A-530

 

ASTM-A358
(Welded pipe)

219.08-750mm

+0.5%

 

-0.3

 

6.0

Refer to ASTM A-530

 

 

 

 

 

 

 

 

 

 

 

Weight & Thickness of Stainless Steel Gauge Pipes

Size (inch)

OD (mm)

Weight per Meter (Kg/m) by Gauge (SWG)

10 SWG (3.2 mm)

12 SWG (2.6 mm)

14 SWG (2.1 mm)

16 SWG (1.65 mm)

18 SWG (1.2 mm)

19 SWG (1.0 mm)

1/2"

12.7

0.754

0.651

0.552

0.452

0.342

0.290

5/8"

15.875

1.006

0.856

0.718

0.582

0.437

0.369

3/4"

19.05

1.258

1.061

0.883

0.712

0.531

0.448

1"

25.4

1.762

1.470

1.214

0.972

0.720

0.605

1 1/4"

31.75

2.266

1.880

1.544

1.232

0.909

0.763

1 1/2"

38.1

2.770

2.289

1.875

1.492

1.098

0.920

2"

50.8

3.778

3.108

2.537

2.012

1.476

1.235

2 1/2"

63.5

4.786

3.928

3.198

2.531

1.854

1.550

3"

76.2

5.794

4.747

3.860

3.051

2.232

1.865

3 1/2"

88.9

6.802

5.566

4.521

3.571

2.610

2.180

4"

101.6

7.810

6.385

5.183

4.091

2.988

2.495

 

FAQ

1. Which standard defines stainless steel pipe dimensions?

Most stainless steel pipe dimensions follow ASME B36.19M, while carbon and alloy steel pipes typically follow ASME B36.10M.

2. What is the difference between Schedule 40 and Schedule 40S?

Schedule 40S is designed for stainless steel pipes. For larger pipe sizes, it generally has a thinner wall than Schedule 40 carbon steel pipe.

3. Which stainless steel grades are most commonly used?

TP304/304L and TP316/316L are the most widely used grades because of their excellent corrosion resistance and mechanical performance.

4. What inspections are commonly performed on stainless steel pipes?

Typical inspections include PMI testing, dimensional measurement, hydrostatic testing, ultrasonic testing, eddy current testing, and visual inspection.

5. How do I choose the correct stainless steel pipe size?

Selection depends on operating pressure, flow requirements, temperature, corrosion conditions, applicable standards, and the pipe schedule specified by the project.


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