Seamless Pipe Size Chart

SteelMerge – High-Quality Stainless Steel Seamless Pipes

Seamless Pipe Size Chart with Schedules and Metric Measurements

Schedule 10 Pipes

Nominal Pipe Size (NPS)	Outer Diameter (OD) [mm]	Wall Thickness [mm]
1/8″	10.3	1.24
1/4″	13.7	1.65
3/8″	17.1	1.65
1/2″	21.3	1.65
3/4″	26.7	1.65
1″	33.4	1.65
1 1/4″	42.2	1.65
1 1/2″	48.3	1.65
2″	60.3	1.65
2 1/2″	73.0	2.11
3″	88.9	2.11
4″	114.3	2.11
5″	141.3	2.77
6″	168.3	2.77
8″	219.1	2.77

Schedule 40 Pipes

Nominal Pipe Size (NPS)	Outer Diameter (OD) [mm]	Wall Thickness [mm]
1/8″	10.3	1.73
1/4″	13.7	2.24
3/8″	17.1	2.31
1/2″	21.3	2.77
3/4″	26.7	2.87
1″	33.4	3.38
1 1/4″	42.2	3.56
1 1/2″	48.3	3.68
2″	60.3	3.91
2 1/2″	73.0	5.16
3″	88.9	5.49
4″	114.3	6.02
5″	141.3	6.55
6″	168.3	7.11
8″	219.1	8.18

Schedule 80 Pipes

Nominal Pipe Size (NPS)	Outer Diameter (OD) [mm]	Wall Thickness [mm]
1/8″	10.3	2.41
1/4″	13.7	3.02
3/8″	17.1	3.20
1/2″	21.3	3.73
3/4″	26.7	3.91
1″	33.4	4.55
1 1/4″	42.2	4.85
1 1/2″	48.3	5.08
2″	60.3	5.54
2 1/2″	73.0	7.01
3″	88.9	7.62
4″	114.3	8.56
5″	141.3	9.53
6″	168.3	10.97
8″	219.1	12.70

Schedule 160 Pipes

Nominal Pipe Size (NPS)	Outer Diameter (OD) [mm]	Wall Thickness [mm]
1/2″	21.3	4.78
3/4″	26.7	5.56
1″	33.4	6.35
1 1/4″	42.2	6.35
1 1/2″	48.3	7.14
2″	60.3	8.74
2 1/2″	73.0	9.53
3″	88.9	11.13
4″	114.3	13.49
5″	141.3	15.88
6″	168.3	18.26
8″	219.1	23.01

Note: Custom sizes, schedules, and specifications are available upon request to meet specific project requirements.

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Additional Information

• Materials Available: Grades 304, 316, Duplex, etc.
• Lengths: Standard and custom lengths available.
• End Types: Plain End, Beveled End, Threaded, etc.
• Applications: Ideal for various industries including petrochemical, aerospace, and water treatment.
• Certifications: Adherence to international quality and safety standards.