Full API 5L / ISO 3183 specification data: seamless, ERW, LSAW and SSAW line pipe dimensions
(OD, wall, weight), grade properties for all PSL1 and PSL2 grades B through X120, chemistry
composition and tensile requirements. Data per API 5L 46th edition.
API 5L / ISO 3183 governs line pipe for oil, gas, and water transmission pipelines. PSL1 covers grades L175/A25 through L485/X70. PSL2 extends to L830/X120 with carbon equivalent limits and mandatory Charpy impact testing.
Use these tables to find OD, wall thickness, weight per metre, and grade mechanical and chemistry properties for seamless, ERW, LSAW, and SSAW pipe.
Looking for the full pipe schedule chart? API 5L does not tabulate sizes; the size tabs on this page show common ASME B36.10M sizes that fall inside API 5L Table 9. For the complete ASME B36.10M reference table covering all standard pipe schedules across all NPS sizes, see ASME B36.10M Pipe Schedule Chart →
Table data verified 2026-07-01 — API 5L 46th Edition.
Showing 33 of 33 sizes
Seamless Line Pipe Sizes NPS ½–24 — OD, Wall Thickness, Plain-End Weight and ID (ASME B36.10M values, each inside API 5L 46th Edition Table 9)
OD (in)
OD (mm)
Wall (mm)
Weight (kg/m)
Weight (lb/ft)
ID (mm)
1/2"
21.34
2.77
1.27
0.85
15.80
3/4"
26.67
2.87
1.68
1.13
20.93
1"
33.4
3.38
2.50
1.68
26.64
1-1/4"
42.16
3.56
3.39
2.27
35.04
1-1/2"
48.26
3.68
4.05
2.72
40.90
2"
60.32
3.91
5.44
3.66
52.50
2-1/2"
73.02
5.16
8.64
5.80
62.70
3"
88.9
5.49
11.29
7.58
77.92
3-1/2"
101.6
5.74
13.57
9.12
90.12
4"
114.3
6.02
16.08
10.80
102.26
4"
114.3
7.92
20.78
13.97
98.46
5"
141.3
6.55
21.77
14.63
128.20
5"
141.3
9.52
30.94
20.80
122.26
6"
168.27
7.11
28.26
18.99
154.05
6"
168.27
10.97
42.56
28.60
146.33
8"
219.07
8.18
42.54
28.58
202.71
8"
219.07
12.70
64.64
43.43
193.67
10"
273.05
9.27
60.30
40.52
254.51
10"
273.05
12.70
81.54
54.79
247.65
12"
323.85
9.52
73.80
49.61
304.81
12"
323.85
12.70
97.45
65.48
298.45
14"
355.6
9.52
81.25
54.62
336.56
14"
355.6
12.70
107.40
72.16
330.20
16"
406.4
9.52
93.18
62.64
387.36
16"
406.4
12.70
123.31
82.85
381.00
18"
457.2
9.52
105.11
70.65
438.16
18"
457.2
12.70
139.22
93.54
431.80
20"
508
9.52
117.03
78.67
488.96
20"
508
12.70
155.13
104.23
482.60
22"
558.8
9.52
128.96
86.69
539.76
22"
558.8
12.70
171.04
114.92
533.40
24"
609.6
9.52
140.89
94.71
590.56
24"
609.6
12.70
186.95
125.61
584.20
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Sizes and weights: ASME B36.10M. API 5L lists no sizes of its own — Table 9 sets the permissible OD × wall range, and its NOTE refers to ISO 4200 and ASME B36.10M for standardized values. Every row here is inside Table 9. Seamless pipe OD range ½″–24″; one or two representative walls per OD — other walls inside Table 9 can be ordered. Contact ZC to confirm specific wall/grade/PSL combinations.
Use our interactive design pressure and wall thickness calculator for API 5L line pipe.
ERW, LSAW and SSAW Line Pipe Sizes — OD, Wall Thickness and Plain-End Weight (ASME B36.10M values, each inside API 5L 46th Edition Table 9)
Type
OD (in)
OD (mm)
Wall (mm)
Weight (kg/m)
Weight (lb/ft)
Grade Range
ERW
2"
60.32
3.91
5.44
3.66
B, X42–X65
ERW
3"
88.9
5.49
11.29
7.58
B, X42–X65
ERW
4"
114.3
6.02
16.08
10.80
B, X42–X65
ERW
6"
168.27
7.11
28.26
18.99
B, X42–X65
ERW
8"
219.07
8.18
42.54
28.58
B, X42–X65
ERW
10"
273.05
9.27
60.30
40.52
B, X42–X65
ERW
12"
323.85
9.52
73.80
49.61
B, X42–X65
ERW
14"
355.6
9.52
81.25
54.62
B, X42–X65
ERW
16"
406.4
9.52
93.18
62.64
B, X42–X65
ERW
18"
457.2
9.52
105.11
70.65
B, X42–X65
ERW
20"
508
9.52
117.03
78.67
B, X42–X65
ERW
24"
609.6
9.52
140.89
94.71
B, X42–X65
LSAW
16"
406.4
9.52
93.18
62.64
Gr. B–X80
LSAW
16"
406.4
12.70
123.31
82.85
Gr. B–X80
LSAW
16"
406.4
15.88
152.94
102.72
Gr. B–X80
LSAW
18"
457.2
9.52
105.11
70.65
Gr. B–X80
LSAW
18"
457.2
12.70
139.22
93.54
Gr. B–X80
LSAW
18"
457.2
19.05
205.84
138.30
Gr. B–X80
LSAW
20"
508
9.52
117.03
78.67
Gr. B–X80
LSAW
20"
508
12.70
155.13
104.23
Gr. B–X80
LSAW
20"
508
19.05
229.71
154.34
Gr. B–X80
LSAW
24"
609.6
9.52
140.89
94.71
Gr. B–X80
LSAW
24"
609.6
12.70
186.95
125.61
Gr. B–X80
LSAW
24"
609.6
19.05
277.44
186.41
Gr. B–X80
LSAW
28"
711.2
12.70
218.77
146.99
Gr. B–X80
LSAW
28"
711.2
19.05
325.17
218.48
Gr. B–X80
LSAW
30"
762
12.70
234.68
157.68
Gr. B–X80
LSAW
30"
762
19.05
349.04
234.51
Gr. B–X80
LSAW
32"
812.8
12.70
250.59
168.37
Gr. B–X80
LSAW
32"
812.8
19.05
372.91
250.55
Gr. B–X80
LSAW
36"
914.4
12.70
282.41
189.75
Gr. B–X80
LSAW
36"
914.4
19.05
420.64
282.62
Gr. B–X80
LSAW
42"
1066.8
12.70
330.15
221.82
Gr. B–X80
LSAW
42"
1066.8
19.05
492.23
330.72
Gr. B–X80
LSAW
48"
1219.2
12.70
377.88
253.89
Gr. B–X80
LSAW
48"
1219.2
19.05
563.83
378.83
Gr. B–X80
SSAW
16"
406.4
7.92
77.83
52.32
Gr. B–X70
SSAW
20"
508
7.92
97.68
65.66
Gr. B–X70
SSAW
24"
609.6
9.52
140.89
94.71
Gr. B–X70
SSAW
30"
762
9.52
176.67
118.76
Gr. B–X70
SSAW
36"
914.4
9.52
212.45
142.81
Gr. B–X70
SSAW
42"
1066.8
9.52
248.23
166.86
Gr. B–X70
SSAW
48"
1219.2
9.52
284.01
190.92
Gr. B–X70
SSAW
60"
1524
9.52
355.57
239.02
Gr. B–X65
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Sizes and weights: ASME B36.10M, each inside API 5L Table 9. Our welded line pipe range (ERW, LSAW, SSAW) runs from 2″ to 60″ OD. Multiple wall thicknesses available per OD — representative values shown. Contact ZC for specific combinations.
API 5L PSL2 Mechanical Properties — Yield, Max Yield, Tensile, Y/T Ratio and Delivery Condition for Grades B through X120 (API 5L 46th Edition, Table 7)
Grade
Min Yield (MPa)
Max Yield (MPa)
Min Tensile (MPa)
Max Tensile (MPa)
Max Y/T Ratio
Delivery Conditions
L245 / B
245
450
415
655
0.93
R, N, Q, M
L290 / X42
290
495
415
655
0.93
R, N, Q, M
L320 / X46
320
525
435
655
0.93
N, Q, M
L360 / X52
360
530
460
760
0.93
N, Q, M
L390 / X56
390
545
490
760
0.93
N, Q, M
L415 / X60
415
565
520
760
0.93
N, Q, M
L450 / X65
450
600
535
760
0.93
Q, M
L485 / X70
485
635
570
760
0.93
Q, M
L555 / X80
555
705
625
825
0.93
Q, M
L625 / X90
625*
775
695
915
0.95 (M) / 0.97 (Q)
Q, M
L690 / X100
690*
840
760
990
0.97
Q, M
L830 / X120
830*
1050
915
1145
0.99
M
* Rp0.2 used in place of Rt0.5
Y/T ratio applies when D > 323.9 mm (12.750 in).
API 5L PSL1 Mechanical Properties — Minimum Yield and Tensile Strength for Grades L175/A25 through L485/X70 (API 5L 46th Edition, Table 6)
Grade
Min Yield (MPa)
Min Yield (psi)
Min Tensile (MPa)
Min Tensile (psi)
Weld Seam Min Tensile (MPa)
L175 / A25
175
25400
310
45000
310
L175P / A25P
175
25400
310
45000
310
L210 / A
210
30500
335
48600
335
L245 / B
245
35500
415
60200
415
L290 / X42
290
42100
415
60200
415
L320 / X46
320
46400
435
63100
435
L360 / X52
360
52200
460
66700
460
L390 / X56
390
56600
490
71100
490
L415 / X60
415
60200
520
75400
520
L450 / X65
450
65300
535
77600
535
L485 / X70
485
70300
570
82700
570
API 5L PSL2 Chemical Composition — C, Si, Mn, P, S, V, Nb, Ti, CE_IIW and CE_Pcm by Grade Variant (API 5L 46th Edition, Table 5)
Variant
C max
Si max
Mn max
P max
S max
V max
Nb max
Ti max
CE IIW
CE Pcm
L245R / BR
0.24
0.4
1.2
0.025
0.015
—
—
0.04
0.43
0.25
L245N / BN
0.24
0.4
1.2
0.025
0.015
—
—
0.04
0.43
0.25
L245Q / BQ
0.18
0.45
1.4
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L245M / BM
0.22
0.45
1.2
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L290R / X42R
0.24
0.4
1.2
0.025
0.015
0.06
0.05
0.04
0.43
0.25
L290N / X42N
0.24
0.4
1.2
0.025
0.015
0.06
0.05
0.04
0.43
0.25
L290Q / X42Q
0.18
0.45
1.4
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L290M / X42M
0.22
0.45
1.3
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L320N / X46N
0.24
0.4
1.4
0.025
0.015
0.07
0.05
0.04
0.43
0.25
L320Q / X46Q
0.18
0.45
1.4
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L320M / X46M
0.22
0.45
1.3
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L360N / X52N
0.24
0.45
1.4
0.025
0.015
0.1
0.05
0.04
0.43
0.25
L360Q / X52Q
0.18
0.45
1.5
0.025
0.015
0.05
0.05
0.04
0.43
0.25
L360M / X52M
0.22
0.45
1.4
0.025
0.015
—
—
—
0.43
0.25
L390N / X56N
0.24
0.45
1.4
0.025
0.015
0.1
0.05
0.04
0.43
0.25
L390Q / X56Q
0.18
0.45
1.5
0.025
0.015
0.07
0.05
0.04
0.43
0.25
L390M / X56M
0.22
0.45
1.4
0.025
0.015
—
—
—
0.43
0.25
L415N / X60N
0.24
0.45
1.4
0.025
0.015
0.1
0.05
0.04
—
—
L415Q / X60Q
0.18
0.45
1.7
0.025
0.015
—
—
—
0.43
0.25
L415M / X60M
0.12
0.45
1.6
0.025
0.015
—
—
—
0.43
0.25
L450Q / X65Q
0.18
0.45
1.7
0.025
0.015
—
—
—
0.43
0.25
L450M / X65M
0.12
0.45
1.6
0.025
0.015
—
—
—
0.43
0.25
L485Q / X70Q
0.18
0.45
1.8
0.025
0.015
—
—
—
0.43
0.25
L485M / X70M
0.12
0.45
1.7
0.025
0.015
—
—
—
0.43
0.25
L555Q / X80Q
0.18
0.45
1.9
0.025
0.015
—
—
—
—
0.25
L555M / X80M
0.12
0.45
1.85
0.025
0.015
—
—
—
0.43
0.25
L625Q / X90Q
0.16
0.45
1.9
0.02
0.01
—
—
—
—
0.25
L625M / X90M
0.1
0.55
2.1
0.02
0.01
—
—
—
—
0.25
L690Q / X100Q
0.16
0.45
1.9
0.02
0.01
—
—
—
—
0.25
L690M / X100M
0.1
0.55
2.1
0.02
0.01
—
—
—
—
0.25
L830M / X120M
0.1
0.55
2.1
0.02
0.01
—
—
—
—
0.25
Nb + V + Ti ≤ 0.15% (per grade footnote)
% max unless noted. — = no individual limit specified; refer to combined-element footnote where applicable.
API 5L PSL1 Chemical Composition — Maximum C, Mn, P and S by Grade and Manufacturing Process (API 5L 46th Edition, Table 4)
Grade
Process
C max
Mn max
P max
S max
L175 / A25
Seamless
0.21
0.6
0.03
0.03
L175 / A25
Welded
0.21
0.6
0.03
0.03
L175P / A25P
Seamless
0.21
0.6
0.045 – 0.08
0.03
L175P / A25P
Welded
0.21
0.6
0.045 – 0.08
0.03
L210 / A
Seamless
0.22
0.9
0.03
0.03
L210 / A
Welded
0.22
0.9
0.03
0.03
L245 / B
Seamless
0.28
1.2
0.03
0.03
L245 / B
Welded
0.26
1.2
0.03
0.03
L290 / X42
Seamless
0.28
1.3
0.03
0.03
L290 / X42
Welded
0.26
1.3
0.03
0.03
L320 / X46
Seamless
0.28
1.4
0.03
0.03
L320 / X46
Welded
0.26
1.4
0.03
0.03
L360 / X52
Seamless
0.28
1.4
0.03
0.03
L360 / X52
Welded
0.26
1.4
0.03
0.03
L390 / X56
Seamless
0.28
1.4
0.03
0.03
L390 / X56
Welded
0.26
1.4
0.03
0.03
L415 / X60
Seamless
0.28
1.4
0.03
0.03
L415 / X60
Welded
0.26
1.4
0.03
0.03
L450 / X65
Seamless
0.28
1.4
0.03
0.03
L450 / X65
Welded
0.26
1.45
0.03
0.03
L485 / X70
Seamless
0.28
1.4
0.03
0.03
L485 / X70
Welded
0.26
1.65
0.03
0.03
Nb + V + Ti ≤ 0.15% (per grade footnote)
Nb + V ≤ 0.06% (per grade footnote)
Frequently Asked Questions
What is the minimum wall thickness for API 5L X65 pipe?
API 5L does not specify a minimum wall thickness for X65: the purchaser states the outside diameter and wall thickness on the order (7.1 f)), within the permissible range of Table 9. The wall tolerance then comes from Table 11, which depends on the process and the wall, not on the grade or the PSL. For seamless pipe over 4.0 mm and under 25.0 mm it is +0.150t / −0.125t; for welded pipe over 5.0 mm and under 15.0 mm it is ± 0.1t. For a 12.7 mm specified wall, the minimum acceptable wall is 11.11 mm seamless and 11.43 mm welded. Thinner and thicker walls take the absolute values in Table 11 (for seamless walls of 25.0 mm and over, the greater of an absolute value and 0.1t).
What is the difference between API 5L PSL1 and PSL2?
PSL1 is the baseline product specification level. PSL2 adds a maximum yield strength, yield-to-tensile ratio limits, carbon equivalent limits and mandatory Charpy impact testing of the pipe body (Table 18, item 9). The diameter and wall thickness tolerances (Tables 10 and 11) are the same for both PSLs; the dimensional difference is the ends: PSL2 pipe is furnished plain-end only (9.12.1.2), while threaded, belled and special-coupling ends are PSL1 only. Pipe ordered for sour service (Annex H) or offshore service (Annex J) is PSL2 by definition.
What does the suffix letter mean in API 5L grade designations?
The suffix letter in PSL2 API 5L grades indicates the delivery condition (heat treatment): N = normalised or normalised rolled, Q = quenched and tempered, M = thermomechanical rolled, R = as-rolled (limited to certain grades).
What is the minimum yield strength of API 5L Grade X65?
For API 5L Grade X65 (L450), the specified minimum yield strength is 450 MPa (65,300 psi) for both PSL1 and PSL2. PSL2 adds a maximum yield strength of 600 MPa (87,000 psi), a tensile strength of 535 MPa (77,600 psi) minimum to 760 MPa (110,200 psi) maximum, and a maximum yield-to-tensile ratio of 0.93 (API 5L Table 7). These upper limits give predictable behaviour under operating loads and during field bending.
What end finish options are available for API 5L line pipe?
API 5L 9.12 covers plain ends, threaded ends, belled ends and ends prepared for special couplings. Threaded, belled and special-coupling ends are PSL1 only, and threads follow API 5B; PSL2 pipe is always plain-end. Unless otherwise agreed, plain ends are square cut up to 3.2 mm wall and bevelled for welding above that, with a 30° bevel (+5°/−0°) (9.12.5); other bevel preparations can be agreed. Bevelled plain-end pipe is what most onshore and offshore transmission pipelines specify for girth welding.
