Stainless steel seamless pipes & tubes · Size & tolerance table

Stainless pipe sizes and schedules (ASME B36.19M)

Standard: ASME B36.19M (stainless pipe dimensions) · ASTM A312 / A999 (tolerances)

Stainless steel pipe is ordered by nominal pipe size (NPS, or DN in millimetres) and a schedule. The outside diameter of each size is the same as for carbon steel pipe to ASME B36.10M; the "S" schedules of ASME B36.19M set the wall thickness. 40S and 80S are the same walls as Standard and Extra Strong in B36.10M; 5S and 10S are light walls used for low-pressure process and water lines.

The mass per metre is calculated for austenitic stainless steel (density 7.93 kg/dm³) as (OD − t) × t × 0.02491. Carbon steel tables, which use 7.85 kg/dm³, are about 1% lighter for the same size.

ASME B36.19M stainless pipe — wall thickness and mass

Size			Schedule 5S		Schedule 10S		Schedule 40S		Schedule 80S
NPS in	DN	OD mm	t mm	Mass kg/m	t mm	Mass kg/m	t mm	Mass kg/m	t mm	Mass kg/m
1/8	6	10.3	–	–	1.24	0.28	1.73	0.37	2.41	0.47
1/4	8	13.7	–	–	1.65	0.50	2.24	0.64	3.02	0.80
3/8	10	17.1	–	–	1.65	0.64	2.31	0.85	3.20	1.11
1/2	15	21.3	1.65	0.81	2.11	1.01	2.77	1.28	3.73	1.63
3/4	20	26.7	1.65	1.03	2.11	1.29	2.87	1.70	3.91	2.22
1	25	33.4	1.65	1.30	2.77	2.11	3.38	2.53	4.55	3.27
1 1/4	32	42.2	1.65	1.67	2.77	2.72	3.56	3.43	4.85	4.51
1 1/2	40	48.3	1.65	1.92	2.77	3.14	3.68	4.09	5.08	5.47
2	50	60.3	1.65	2.41	2.77	3.97	3.91	5.49	5.54	7.56
2 1/2	65	73.0	2.11	3.73	3.05	5.31	5.16	8.72	7.01	11.52
3	80	88.9	2.11	4.56	3.05	6.52	5.49	11.41	7.62	15.43
3 1/2	90	101.6	2.11	5.23	3.05	7.49	5.74	13.71	8.08	18.82
4	100	114.3	2.11	5.90	3.05	8.45	6.02	16.24	8.56	22.55
5	125	141.3	2.77	9.56	3.40	11.68	6.55	21.99	9.53	31.28
6	150	168.3	2.77	11.42	3.40	13.97	7.11	28.55	10.97	42.99
8	200	219.1	2.77	14.93	3.76	20.17	8.18	42.98	12.70	65.30
10	250	273.0	3.40	22.83	4.19	28.06	9.27	60.90	12.70	82.35
12	300	323.8	3.96	31.55	4.57	36.34	9.53	74.61	12.70	98.42
14	350	355.6	3.96	34.69	4.78	41.77	9.53	82.15	12.70	108.48
16	400	406.4	4.19	41.98	4.78	47.82	9.53	94.21	12.70	124.55
18	450	457	4.19	47.26	4.78	53.85	9.53	106.23	12.70	140.56
20	500	508	4.78	59.92	5.54	69.34	9.53	118.33	12.70	156.69
22	550	559	4.78	65.99	5.54	76.38	9.53	130.44	12.70	172.83
24	600	610	5.54	83.42	6.35	95.48	9.53	142.55	12.70	188.96
30	750	762	6.35	119.53	7.92	148.77	–	–	–	–

Notes

NPS 1/8 to 3/8 have no schedule 5S. NPS 30 is listed in schedules 5S and 10S only; heavier walls and sizes above NPS 30 are taken from ASME B36.10M (schedules 20, 30, 40, 60, 80… and STD, XS).
ASTM A312 allows the wall to be 12.5% under the nominal thickness; order "minimum wall" if the design calls for it.
Ferritic and duplex grades are about 1–3% lighter (densities 7.70 and 7.80 kg/dm³).