What are the sizes of API line pipe?

API line pipe sizes are usually specified by their nominal pipe size (NPS) or outside diameter (OD) and wall thickness. NPS is a standardized numeric designation that roughly indicates the size of the pipe, while the OD and wall thickness provide precise measurements. Typically, API line pipe ODs range from 21.3mm to 1026mm, and wall thicknesses range from 2.0mm to 120mm.

API 5L Pipe Sizes and Schedule Chart

Outside Diameter O.D. (in)	NPS (in)	Pipe Schedule
		SCH 10	SCH 20	SCH 30	SCH STD	SCH 40	SCH 60	SCH XS	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160	SCH XXS
		Wall Thickness (in)
0.405	1/8				0.068	0.068		0.095	0.095
0.540	1/4				0.088	0.088		0.119	0.119
0.675	3/8				0.091	0.091		0.126	0.126
0.840	1/2				0.109	0.109		0.147	0.147				0.187	0.294
1.050	3/4				0.113	0.113		0.154	0.154				0.219	0.308
1.315	1				0.133	0.133		0.179	0.179				0.250	0.358
1.660	1 1/4				0.140	0.140		0.191	0.191				0.250	0.382
1.900	1 1/2				0.145	0.145		0.200	0.200				0.281	0.400
2.375	2				0.154	0.154		0.218	0.218				0.344	0.436
2.875	2 1/2				0.203	0.203		0.276	0.276				0.375	0.552
3.500	3				0.216	0.216		0.300	0.300				0.438	0.600
4.000	3 1/2				0.226	0.226		0.318	0.318
4.500	4				0.237	0.237		0.337	0.337		0.438		0.531	0.674
5.563	5				0.258	0.258		0.375	0.375		0.500		0.625	0.750
6.625	6				0.280	0.280		0.432	0.432		0.562		0.719	0.864
8.625	8		0.250	0.277	0.322	0.322	0.406	0.500	0.500	0.594	0.719	0.812	0.906	0.875
10.750	10		0.250	0.307	0.365	0.365	0.500	0.500	0.594	0.719	0.844	1.000	1.125	1.000
12.750	12		0.250	0.330	0.375	0.406	0.562	0.500	0.688	0.844	1.000	1.125	1.312	1.000
14.000	14	0.250	0.312	0.375	0.375	0.438	0.594	0.500	0.750	0.938	1.094	1.250	1.406
16.000	16	0.250	0.312	0.375	0.375	0.500	0.656	0.500	0.844	1.031	1.219	1.438	1.594
18.000	18	0.250	0.312	0.438	0.375	0.562	0.750	0.500	0.938	1.156	1.375	1.562	1.781
20.000	20	0.250	0.375	0.500	0.375	0.594	0.812	0.500	1.031	1.281	1.500	1.750	1.969
22.000	22	0.250	0.375	0.500	0.375		0.875	0.500	1.125	1.375	1.625	1.875	2.125
24.000	24	0.250	0.375	0.562	0.375	0.688	0.969	0.500	1.219	1.531	1.812	2.062	2.344
30.000	30	0.312	0.500	0.625	0.375			0.500
32.000	32	0.312	0.500	0.625	0.375	0.688
34.000	34	0.312	0.500	0.625	0.375	0.688
36.000	36	0.312	0.500	0.625	0.375	0.750
42.000	42		0.500	0.625	0.375	0.750

Pipe NPS	Schedule No	Outside Diameter, Inches	Wall Thickness, inches	Plain End Weight, lb/ft	Outside Diameter, mm	Wall Thickness, mm	Plain End Mass, Kg/m
1/8	40/STD	0.405 Inches	0.068 Inches	0.24	10.3 mm	1.73 mm	0.37 Kg/m
1⁄4	40/STD	0.540 Inches	0.088 Inches	0.43	13.7 mm	2.24 mm	0.63 Kg/m
3⁄8	40/STD	0.675 Inches	0.091 Inches	0.57	17.1 mm	2.31 mm	0.84 Kg/m
1⁄2	40/STD	0.840 Inches	0.109 Inches	0.85	21.3 mm	2.77 mm	1.27 Kg/m
3⁄4	40/STD	1.050 Inches	0.113 Inches	1.13	26.7 mm	2.87 mm	1.69 Kg/m
1	40/STD	1.315 Inches	0.133 Inches	1.68	33.4 mm	3.38 mm	2.50 Kg/m
1-1⁄4	40/STD	1.660 Inches	0.140 Inches	2.27	42.2 mm	3.56 mm	3.39 Kg/m
1-1⁄2	40/STD	1.900 Inches	0.145 Inches	2.72	48.3 mm	3.68 mm	4.05 Kg/m
2	40/STD	2.375 Inches	0.154 Inches	3.66	60.3 mm	3.91 mm	5.44 Kg/m
2-1⁄2	40/STD	2.875 Inches	0.203 Inches	5.80	73.0 mm	5.16 mm	8.63 Kg/m
3	40/STD	3.500 Inches	0.216 Inches	7.58	88.9 mm	5.49 mm	11.29 Kg/m
4	40/STD	4.500 Inches	0.237 Inches	10.80	114.3 mm	6.02 mm	16.08 Kg/m
5	40/STD	5.563 Inches	0.258 Inches	14.63	141.3 mm	6.55 mm	21.77 Kg/m
6	40/STD	6.625 Inches	0.280 Inches	18.99	168.3 mm	7.11 mm	28.26 Kg/m
8	40/STD	8.625 Inches	0.322 Inches	28.58	219.1 mm	8.18 mm	42.55 Kg/m
10	40/STD	10.750 Inches	0.365 Inches	40.52	273.0 mm	9.27 mm	60.29 Kg/m
12	40	12.750 Inches	0.406 Inches	53.57	323.8 mm	10.31 mm	79.71 Kg/m
14	40	14.000 Inches	0.438 Inches	63.50	355.6 mm	11.13 mm	94.55 Kg/m
16	40	16.000 Inches	0.500 Inches	82.85	406.4 mm	12.70 mm	123.31 Kg/m
18	40	18.000 Inches	0.562 Inches	104.76	457 mm	14.27 mm	155.81 Kg/m
20	40	20.000 Inches	0.594 Inches	123.23	508 mm	15.09 mm	183.43 Kg/m
24	40	24.000 Inches	0.688 Inches	171.45	610 mm	17.48 mm	255.43 Kg/m
32	40	32.000 Inches	0.688 Inches	230.29	813 mm	17.48 mm	342.94 Kg/m
34	40	34.000 Inches	0.688 Inches	245.00	864 mm	17.48 mm	364.92 Kg/m
36	40	36.000 Inches	0.750 Inches	282.62	914 mm	19.05 mm	420.45 Kg/m