Seamless tubes & pipes · Size & tolerance table

Pipe sizes and schedules (ASME B36.10M)

Standard: ASME B36.10M (welded and seamless wrought steel pipe)

Carbon steel pipe is ordered by nominal pipe size (NPS) or DN, and by schedule or wall thickness. The outside diameter of a size is fixed; a heavier schedule thickens the wall inwards. From NPS 14 up the NPS is the outside diameter in inches.

The same dimensions are used by ASTM A106, ASTM A53 and API 5L, seamless or welded. STD, XS and XXS are the older weight classes: STD is the same as Schedule 40 up to NPS 10 and XS the same as Schedule 80 up to NPS 8; above that they part company, as the table shows.

Plain-end mass is calculated as (OD − t) × t × 0.02466 kg/m, the formula ASME B36.10M uses. Stainless steel pipe has its own thinner schedules (5S, 10S) in ASME B36.19M.

Outside diameter, wall thickness and mass

Size				Wall			Mass
NPS in	DN	OD mm	OD in	Schedule	t mm	t in	Plain end kg/m
1/8	6	10.3	0.405	10	1.24	0.049	0.28
1/8	6	10.3	0.405	STD / 40	1.73	0.068	0.37
1/8	6	10.3	0.405	XS / 80	2.41	0.095	0.47
1/4	8	13.7	0.540	10	1.65	0.065	0.49
1/4	8	13.7	0.540	STD / 40	2.24	0.088	0.63
1/4	8	13.7	0.540	XS / 80	3.02	0.119	0.80
3/8	10	17.1	0.675	10	1.65	0.065	0.63
3/8	10	17.1	0.675	STD / 40	2.31	0.091	0.84
3/8	10	17.1	0.675	XS / 80	3.20	0.126	1.10
1/2	15	21.3	0.840	10	2.11	0.083	1.00
1/2	15	21.3	0.840	STD / 40	2.77	0.109	1.27
1/2	15	21.3	0.840	XS / 80	3.73	0.147	1.62
1/2	15	21.3	0.840	160	4.78	0.188	1.95
1/2	15	21.3	0.840	XXS	7.47	0.294	2.55
3/4	20	26.7	1.050	10	2.11	0.083	1.28
3/4	20	26.7	1.050	STD / 40	2.87	0.113	1.69
3/4	20	26.7	1.050	XS / 80	3.91	0.154	2.20
3/4	20	26.7	1.050	160	5.56	0.219	2.90
3/4	20	26.7	1.050	XXS	7.82	0.308	3.64
1	25	33.4	1.315	10	2.77	0.109	2.09
1	25	33.4	1.315	STD / 40	3.38	0.133	2.50
1	25	33.4	1.315	XS / 80	4.55	0.179	3.24
1	25	33.4	1.315	160	6.35	0.250	4.24
1	25	33.4	1.315	XXS	9.09	0.358	5.45
1 1/4	32	42.2	1.660	10	2.77	0.109	2.69
1 1/4	32	42.2	1.660	STD / 40	3.56	0.140	3.39
1 1/4	32	42.2	1.660	XS / 80	4.85	0.191	4.47
1 1/4	32	42.2	1.660	160	6.35	0.250	5.61
1 1/4	32	42.2	1.660	XXS	9.70	0.382	7.77
1 1/2	40	48.3	1.900	10	2.77	0.109	3.11
1 1/2	40	48.3	1.900	STD / 40	3.68	0.145	4.05
1 1/2	40	48.3	1.900	XS / 80	5.08	0.200	5.41
1 1/2	40	48.3	1.900	160	7.14	0.281	7.25
1 1/2	40	48.3	1.900	XXS	10.15	0.400	9.55
2	50	60.3	2.375	10	2.77	0.109	3.93
2	50	60.3	2.375	STD / 40	3.91	0.154	5.44
2	50	60.3	2.375	XS / 80	5.54	0.218	7.48
2	50	60.3	2.375	160	8.74	0.344	11.11
2	50	60.3	2.375	XXS	11.07	0.436	13.44
2 1/2	65	73.0	2.875	10	3.05	0.120	5.26
2 1/2	65	73.0	2.875	STD / 40	5.16	0.203	8.63
2 1/2	65	73.0	2.875	XS / 80	7.01	0.276	11.41
2 1/2	65	73.0	2.875	160	9.53	0.375	14.92
2 1/2	65	73.0	2.875	XXS	14.02	0.552	20.39
3	80	88.9	3.500	10	3.05	0.120	6.46
3	80	88.9	3.500	STD / 40	5.49	0.216	11.29
3	80	88.9	3.500	XS / 80	7.62	0.300	15.27
3	80	88.9	3.500	160	11.13	0.438	21.35
3	80	88.9	3.500	XXS	15.24	0.600	27.68
3 1/2	90	101.6	4.000	10	3.05	0.120	7.41
3 1/2	90	101.6	4.000	STD / 40	5.74	0.226	13.57
3 1/2	90	101.6	4.000	XS / 80	8.08	0.318	18.64
4	100	114.3	4.500	10	3.05	0.120	8.37
4	100	114.3	4.500	STD / 40	6.02	0.237	16.08
4	100	114.3	4.500	XS / 80	8.56	0.337	22.32
4	100	114.3	4.500	120	11.13	0.438	28.32
4	100	114.3	4.500	160	13.49	0.531	33.54
4	100	114.3	4.500	XXS	17.12	0.674	41.03
5	125	141.3	5.563	10	3.40	0.134	11.56
5	125	141.3	5.563	STD / 40	6.55	0.258	21.77
5	125	141.3	5.563	XS / 80	9.53	0.375	30.97
5	125	141.3	5.563	120	12.70	0.500	40.28
5	125	141.3	5.563	160	15.88	0.625	49.12
5	125	141.3	5.563	XXS	19.05	0.750	57.43
6	150	168.3	6.625	10	3.40	0.134	13.83
6	150	168.3	6.625	STD / 40	7.11	0.280	28.26
6	150	168.3	6.625	XS / 80	10.97	0.432	42.56
6	150	168.3	6.625	120	14.27	0.562	54.21
6	150	168.3	6.625	160	18.26	0.719	67.57
6	150	168.3	6.625	XXS	21.95	0.864	79.22
8	200	219.1	8.625	10	3.76	0.148	19.97
8	200	219.1	8.625	20	6.35	0.250	33.32
8	200	219.1	8.625	30	7.04	0.277	36.82
8	200	219.1	8.625	STD / 40	8.18	0.322	42.55
8	200	219.1	8.625	60	10.31	0.406	53.09
8	200	219.1	8.625	XS / 80	12.70	0.500	64.64
8	200	219.1	8.625	100	15.09	0.594	75.92
8	200	219.1	8.625	120	18.26	0.719	90.44
8	200	219.1	8.625	140	20.62	0.812	100.93
8	200	219.1	8.625	XXS	22.23	0.875	107.93
8	200	219.1	8.625	160	23.01	0.906	111.27
10	250	273.0	10.750	10	4.19	0.165	27.78
10	250	273.0	10.750	20	6.35	0.250	41.76
10	250	273.0	10.750	30	7.80	0.307	51.01
10	250	273.0	10.750	STD / 40	9.27	0.365	60.29
10	250	273.0	10.750	XS / 60	12.70	0.500	81.53
10	250	273.0	10.750	80	15.09	0.594	95.98
10	250	273.0	10.750	100	18.26	0.719	114.71
10	250	273.0	10.750	120	21.44	0.844	133.01
10	250	273.0	10.750	140 / XXS	25.40	1.000	155.10
10	250	273.0	10.750	160	28.58	1.125	172.27
12	300	323.8	12.750	10	4.57	0.180	35.98
12	300	323.8	12.750	20	6.35	0.250	49.71
12	300	323.8	12.750	30	8.38	0.330	65.19
12	300	323.8	12.750	STD	9.53	0.375	73.86
12	300	323.8	12.750	40	10.31	0.406	79.71
12	300	323.8	12.750	XS	12.70	0.500	97.44
12	300	323.8	12.750	60	14.27	0.562	108.93
12	300	323.8	12.750	80	17.48	0.688	132.05
12	300	323.8	12.750	100	21.44	0.844	159.87
12	300	323.8	12.750	120 / XXS	25.40	1.000	186.92
12	300	323.8	12.750	140	28.58	1.125	208.08
12	300	323.8	12.750	160	33.32	1.312	238.69
14	350	355.6	14.000	10	6.35	0.250	54.69
14	350	355.6	14.000	20	7.92	0.312	67.91
14	350	355.6	14.000	STD / 30	9.53	0.375	81.33
14	350	355.6	14.000	40	11.13	0.438	94.55
14	350	355.6	14.000	XS	12.70	0.500	107.40
14	350	355.6	14.000	60	15.09	0.594	126.72
14	350	355.6	14.000	80	19.05	0.750	158.11
14	350	355.6	14.000	100	23.83	0.938	194.98
14	350	355.6	14.000	120	27.79	1.094	224.66
14	350	355.6	14.000	140	31.75	1.250	253.58
14	350	355.6	14.000	160	35.71	1.406	281.72
16	400	406.4	16.000	10	6.35	0.250	62.65
16	400	406.4	16.000	20	7.92	0.312	77.83
16	400	406.4	16.000	STD / 30	9.53	0.375	93.27
16	400	406.4	16.000	XS / 40	12.70	0.500	123.31
16	400	406.4	16.000	60	16.66	0.656	160.13
16	400	406.4	16.000	80	21.44	0.844	203.54
16	400	406.4	16.000	100	26.19	1.031	245.57
16	400	406.4	16.000	120	30.96	1.219	286.66
16	400	406.4	16.000	140	36.53	1.438	333.21
16	400	406.4	16.000	160	40.49	1.594	365.38
18	450	457.0	18.000	10	6.35	0.250	70.57
18	450	457.0	18.000	20	7.92	0.312	87.71
18	450	457.0	18.000	STD	9.53	0.375	105.17
18	450	457.0	18.000	30	11.13	0.438	122.38
18	450	457.0	18.000	XS	12.70	0.500	139.16
18	450	457.0	18.000	40	14.27	0.562	155.81
18	450	457.0	18.000	60	19.05	0.750	205.75
18	450	457.0	18.000	80	23.83	0.938	254.57
18	450	457.0	18.000	100	29.36	1.156	309.64
18	450	457.0	18.000	120	34.93	1.375	363.58
18	450	457.0	18.000	140	39.67	1.562	408.28
18	450	457.0	18.000	160	45.24	1.781	459.39
20	500	508.0	20.000	10	6.35	0.250	78.56
20	500	508.0	20.000	STD / 20	9.53	0.375	117.15
20	500	508.0	20.000	XS / 30	12.70	0.500	155.13
20	500	508.0	20.000	40	15.09	0.594	183.43
20	500	508.0	20.000	60	20.62	0.812	247.84
20	500	508.0	20.000	80	26.19	1.031	311.19
20	500	508.0	20.000	100	32.54	1.281	381.55
20	500	508.0	20.000	120	38.10	1.500	441.52
20	500	508.0	20.000	140	44.45	1.750	508.15
20	500	508.0	20.000	160	50.01	1.969	564.85
24	600	610.0	24.000	10	6.35	0.250	94.53
24	600	610.0	24.000	STD / 20	9.53	0.375	141.12
24	600	610.0	24.000	XS	12.70	0.500	187.07
24	600	610.0	24.000	30	14.27	0.562	209.65
24	600	610.0	24.000	40	17.48	0.688	255.43
24	600	610.0	24.000	60	24.61	0.969	355.28
24	600	610.0	24.000	80	30.96	1.219	442.11
24	600	610.0	24.000	100	38.89	1.531	547.74
24	600	610.0	24.000	120	46.02	1.812	640.07
24	600	610.0	24.000	140	52.37	2.062	720.19
24	600	610.0	24.000	160	59.54	2.344	808.27

Notes

Schedules 10, 20, 30, 60, 100, 120 and 140 are not stocked in every size; Schedule 40/STD and 80/XS are the usual stock walls up to NPS 12.
ASME B36.10M also lists many intermediate wall thicknesses and sizes up to NPS 80; only the schedule and weight-class walls are shown here.
Mass of threaded-and-coupled pipe is slightly higher; galvanized pipe is about 3–6% heavier than black in the small sizes.