Pipe Schedule Chart (mm & inch)

Wall thickness in millimetres for every pipe schedule — SCH 10, 40 (STD), 80 (XS), 160 and XXS — by NPS and DN, from 1/2" to 24", to ASME B36.10M.

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/ Overview

What a pipe schedule means

The schedule (SCH) sets the pipe wall thickness for a given nominal size — a higher schedule means a thicker wall and higher pressure rating, with the OD unchanged. STD (standard), XS (extra strong) and XXS (double extra strong) are older equivalents: for most sizes STD = SCH 40 and XS = SCH 80. The chart gives wall thickness in mm to ASME B36.10M.

/ Schedule chart

Wall thickness (mm) by schedule

NPS	DN	OD (mm)	SCH 10	SCH 40 (STD)	SCH 80 (XS)	SCH 160	XXS
1/2″	DN15	21.3	2.11	2.77	3.73	4.78	7.47
3/4″	DN20	26.7	2.11	2.87	3.91	5.56	7.82
1″	DN25	33.4	2.77	3.38	4.55	6.35	9.09
1 1/4″	DN32	42.2	2.77	3.56	4.85	6.35	9.7
1 1/2″	DN40	48.3	2.77	3.68	5.08	7.14	10.15
2″	DN50	60.3	2.77	3.91	5.54	8.74	11.07
2 1/2″	DN65	73.0	3.05	5.16	7.01	9.53	14.02
3″	DN80	88.9	3.05	5.49	7.62	11.13	15.24
4″	DN100	114.3	3.05	6.02	8.56	13.49	17.12
5″	DN125	141.3	3.4	6.55	9.53	15.88	19.05
6″	DN150	168.3	3.4	7.11	10.97	18.26	21.95
8″	DN200	219.1	3.76	8.18	12.7	23.01	22.23
10″	DN250	273.0	4.19	9.27	15.09	28.58	—
12″	DN300	323.8	4.57	10.31	17.48	33.32	—
14″	DN350	355.6	6.35	11.13	19.05	35.71	—
16″	DN400	406.4	6.35	12.7	21.44	40.49	—
18″	DN450	457.0	6.35	14.27	23.83	45.24	—
20″	DN500	508.0	6.35	15.09	26.19	50.01	—
22″	DN550	559.0	6.35	—	—	53.98	—
24″	DN600	610.0	6.35	17.48	30.96	59.54	—

Wall thickness in mm, ASME B36.10M. STD = SCH 40 and XS = SCH 80 up to NPS 10; above that STD = 9.53 mm and XS = 12.70 mm. Larger sizes & intermediate schedules on request.

/ FAQ

Common questions

What is the wall thickness of Schedule 40 pipe in mm?

It varies by size: e.g. NPS 2 SCH 40 is 3.91 mm, NPS 4 is 6.02 mm, NPS 6 is 7.11 mm and NPS 8 is 8.18 mm. See the SCH 40 column above for every size.

What is Schedule 80 pipe thickness in mm?

For example NPS 2 SCH 80 is 5.54 mm, NPS 4 is 8.56 mm and NPS 6 is 10.97 mm. Full values are in the SCH 80 (XS) column above.

What is the difference between STD, XS and XXS?

STD (standard) equals SCH 40 up to NPS 10; XS (extra strong) equals SCH 80 up to NPS 8; XXS (double extra strong) is heavier still. Above NPS 10, STD is fixed at 9.53 mm and XS at 12.70 mm.

Does the schedule change the pipe OD?

No — schedule changes only the wall thickness. The outside diameter is fixed by the nominal size (see the pipe size chart).

/ Related

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