Stainless Steel Pipe Schedule Chart (NPS 1/8 to 12)

Stainless steel pipe schedule chart for NPS 1/8 to 12: 5S, 10S, 40S and 80S wall thickness, OD, ID and kg/m. Labelled drawing, ASME B36.19M.

For preliminary reference and dimensional comparison. Tolerances, pressure capacity and joint safety are not assessed. Confirm against the applicable standard before manufacture or final selection.

Dimension drawing and symbols

D: Outside diameter mm
t: Wall thickness mm
d_i: Calculated inside diameter mm

NPS is a nominal size, not the outside diameter. Schedules with the S suffix are stainless steel series and do not give the same wall as the carbon steel schedule number at every size.

Visible rows: 18

Wall thickness

Stainless steel pipe schedule chart, wall thickness
NPS	DODmm	5S	10S	40S	80S
		Wall thickness t, mm
1/8	10.3	no value	1.24	1.73	2.41
1/4	13.7	no value	1.65	2.24	3.02
3/8	17.1	no value	1.65	2.31	3.20
1/2	21.3	1.65	2.11	2.77	3.73
3/4	26.7	1.65	2.11	2.87	3.91
1	33.4	1.65	2.77	3.38	4.55
1 1/4	42.2	1.65	2.77	3.56	4.85
1 1/2	48.3	1.65	2.77	3.68	5.08
2	60.3	1.65	2.77	3.91	5.54
2 1/2	73.0	2.11	3.05	5.16	7.01
3	88.9	2.11	3.05	5.49	7.62
3 1/2	101.6	2.11	3.05	5.74	8.08
4	114.3	2.11	3.05	6.02	8.56
5	141.3	2.77	3.40	6.55	9.53
6	168.3	2.77	3.40	7.11	10.97
8	219.1	2.77	3.76	8.18	12.70
10	273.1	3.40	4.19	9.27	12.70
12	323.9	3.96	4.57	9.53	12.70

Inside diameter

Inside diameter
NPS	DODmm	5S	10S	40S	80S
		Calculated inside diameter d_i, mm
1/8	10.3	no value	7.82	6.84	5.48
1/4	13.7	no value	10.40	9.22	7.66
3/8	17.1	no value	13.80	12.48	10.70
1/2	21.3	18.00	17.08	15.76	13.84
3/4	26.7	23.40	22.48	20.96	18.88
1	33.4	30.10	27.86	26.64	24.30
1 1/4	42.2	38.90	36.66	35.08	32.50
1 1/2	48.3	45.00	42.76	40.94	38.14
2	60.3	57.00	54.76	52.48	49.22
2 1/2	73.0	68.78	66.90	62.68	58.98
3	88.9	84.68	82.80	77.92	73.66
3 1/2	101.6	97.38	95.50	90.12	85.44
4	114.3	110.08	108.20	102.26	97.18
5	141.3	135.76	134.50	128.20	122.24
6	168.3	162.76	161.50	154.08	146.36
8	219.1	213.56	211.58	202.74	193.70
10	273.1	266.30	264.72	254.56	247.70
12	323.9	315.98	314.76	304.84	298.50

Mass per metre

Mass per metre
NPS	DODmm	5S	10S	40S	80S
		Theoretical mass per metre, kg/m
1/8	10.3	no value	0.28	0.37	0.47
1/4	13.7	no value	0.49	0.64	0.80
3/8	17.1	no value	0.63	0.85	1.10
1/2	21.3	0.80	1.00	1.27	1.63
3/4	26.7	1.03	1.29	1.70	2.21
1	33.4	1.30	2.11	2.52	3.26
1 1/4	42.2	1.66	2.71	3.41	4.50
1 1/2	48.3	1.91	3.13	4.08	5.45
2	60.3	2.40	3.96	5.47	7.53
2 1/2	73.0	3.71	5.29	8.69	11.48
3	88.9	4.54	6.50	11.36	15.37
3 1/2	101.6	5.21	7.46	13.66	18.75
4	114.3	5.88	8.42	16.18	22.46
5	141.3	9.52	11.64	21.91	31.17
6	168.3	11.38	13.91	28.44	42.83
8	219.1	14.87	20.10	42.82	65.06
10	273.1	22.76	27.96	60.70	82.08
12	323.9	31.44	36.22	74.36	98.09

Quick answers

NPS 1/2 10S stainless pipe: OD 21.3 mm, wall thickness 2.11 mm, ID 17.08 mm, mass about 1 kg/m. View in table
NPS 3/4 10S stainless pipe: OD 26.7 mm, wall thickness 2.11 mm, ID 22.48 mm, mass about 1.29 kg/m. View in table
NPS 1 10S stainless pipe: OD 33.4 mm, wall thickness 2.77 mm, ID 27.86 mm, mass about 2.11 kg/m. View in table
NPS 1 40S stainless pipe: OD 33.4 mm, wall thickness 3.38 mm, ID 26.64 mm, mass about 2.52 kg/m. View in table
NPS 2 10S stainless pipe: OD 60.3 mm, wall thickness 2.77 mm, ID 54.76 mm, mass about 3.96 kg/m. View in table
NPS 2 40S stainless pipe: OD 60.3 mm, wall thickness 3.91 mm, ID 52.48 mm, mass about 5.47 kg/m. View in table
NPS 4 10S stainless pipe: OD 114.3 mm, wall thickness 3.05 mm, ID 108.2 mm, mass about 8.42 kg/m. View in table
NPS 6 10S stainless pipe: OD 168.3 mm, wall thickness 3.4 mm, ID 161.5 mm, mass about 13.91 kg/m. View in table

Conditions and notes

Stainless steel pipe dimensions from ASME B36.19M:2004. Mass uses an assumed density of 7900 kg/m³ for grade 304. Nominal geometry is used.

di = D − 2t. Mass per length = 7900 × π × t × (D − t), with D and t in metres. With 8.0 kg/dm³ for grades 316 and 316L the mass is about 1.3% higher.
The standard's own mass column is based on carbon steel density. The mass in this table is calculated separately with a stainless steel density and differs from the standard's chart.
S suffix schedules are not equal to B36.10M schedule numbers at every size. For NPS 12 the 40S wall is 9.53 mm while carbon steel Sch 40 is 10.31 mm. For NPS 10 and 12 the 80S wall is 12.70 mm.
Schedule 5S is not defined for NPS 1/8, 1/4 and 3/8. These cells are blank.
In this edition NPS 10 and 12 have outside diameters of 273.1 and 323.9 mm. The inch values are 10.750 and 12.750 in, exactly 273.05 and 323.85 mm. Sources round these halves up or down, and the carbon steel schedule table on this site gives 273.0 and 323.8 mm. Confirm the contractual edition.
CSV download is unavailable because the sources do not establish permission for reuse.

5S, 10S, 40S and 80S wall thicknesses from NPS 1/8 to 12. Inside diameter and mass per metre are calculated from nominal geometry.

Sources

This table is for preliminary reference. Check the applicable standard and product conditions before use.

Source 1. Undated numerical table. The referenced edition is stated in the conditions.. Accessed: 2026-10-16
Source 2. Undated numerical table. The referenced edition is stated in the conditions.. Accessed: 2026-10-16
Source 3. Undated numerical table. The referenced edition is stated in the conditions.. Accessed: 2026-10-16
Source 4. Version accessed. Accessed: 2026-10-16
Source 5. Version accessed. Accessed: 2026-10-16

Data version: 2026-10-16