10 inch Double extra strong pipe

Dimensions

Published dimensions for 10 inch Double extra strong pipe.
Trade size	NPS 10 · DN 250
Schedule	Double extra strong (XXS)
Standard	ASME B36.10M (welded and seamless wrought steel pipe)
Outside diameter	10.750" · 273.05 mm · designated 273 mm in the metric column
Wall thickness	1.000" · 25.40 mm
Inside diameter	8.750" · 222.25 mm
Weight, plain end	104.23 lb/ft · 155.1 kg/m

Cross-check: the standard plain-end weight formula W = 10.6802 x t x (OD - t) gives 104.13 lb/ft here, 0.1% from the published 104.23 lb/ft. The published figure is the one printed above.

Why 10 inch pipe is not 10 inches

Nominal Pipe Size is a label, not a measurement. NPS 10 pipe has an outside diameter of 10.750 inches, and it keeps that outside diameter in every schedule made. What the schedule number changes is the wall: at double extra strong (xxs) the wall is 1.000 inches, so the bore comes out at 8.750 inches.

That is the practical consequence. Fittings, flanges, supports and threading dies are sized to the outside diameter, so they fit any schedule of the same trade size. Flow, pressure drop and anything that has to pass through the pipe depend on the inside diameter, which changes with every schedule. Order by trade size and schedule; work your hydraulics from the bore.

Other schedules in NPS 10

Same outside diameter of 10.750 inches throughout - only the wall and the bore move.

Every other published schedule for NPS 10.
Schedule	Wall (in)	ID (in)	Weight (lb/ft)
Schedule 5	0.134	10.482	15.21
Schedule 10	0.165	10.420	18.67
Schedule 20	0.250	10.250	28.06
Schedule 30	0.307	10.136	34.27
Schedule 40	0.365	10.020	40.52
Schedule 60	0.500	9.750	54.79
Schedule 80	0.594	9.562	64.49
Schedule 100	0.719	9.312	77.1
Schedule 120	0.844	9.062	89.38
Schedule 140	1.000	8.750	104.23
Schedule 160	1.125	8.500	115.75
Standard wall (STD)	0.365	10.020	40.52
Extra strong (XS)	0.500	9.750	54.79
Schedule 5S	0.134	10.482	not published
Schedule 10S	0.165	10.420	not published
Schedule 40S	0.365	10.020	not published
Schedule 80S	0.500	9.750	not published

Frequently asked questions

What is the wall thickness of 10 inch double extra strong (xxs) pipe?

1.000 inches (25.40 mm). The outside diameter is 10.750 inches (273.05 mm) whatever the schedule, so this wall leaves an inside diameter of 8.750 inches.

What is the inside diameter of 10 inch double extra strong (xxs) pipe?

8.750 inches (222.25 mm). Inside diameter is outside diameter minus twice the wall: 10.750 - 2 x 1.000 = 8.750 inches.

Is 10 inch pipe actually 10 inches?

No. NPS 10 is a trade size, not a measurement. The pipe measures 10.750 inches across the outside and 8.750 inches across the bore in this schedule. Only the outside diameter is fixed across schedules.

How much does 10 inch double extra strong (xxs) pipe weigh?

104.23 pounds per foot plain end (155.1 kg per metre), for carbon steel. Stainless of the same dimensions runs a little lighter, and the figure excludes coatings, linings and fittings.

Where this table stops

This table runs from NPS 1/8 to NPS 24 and stops there. ASME B36.10M itself continues to NPS 80; those larger sizes are not carried here, so a size above NPS 24 is missing rather than undefined.

Where these figures come from

Dimensions are as defined by ASME B36.10M (welded and seamless wrought steel pipe). This site is an independent reference and is not affiliated with, endorsed by or approved by any standards body.

Every value on this page was cross-checked against 3 independent published sources:

ASME B36.10M pipe schedule chart - wall thickness and weights - Flange Bolt Chart, states ASME B36.10M-2018, Table 2.1 (read 2026-08-27)
Dimensions of steel and stainless steel pipes, ASME B36.10 and ASME B36.19 - Wermac, edition not stated (read 2026-08-27)
ANSI / ASME B36.10M pipe dimensions chart - Ferrobend, edition not stated (read 2026-08-27)