Dimension standards for ASTM A53 schedule 40 pipe

ASTM A53/A53M is a standard for carbon steel pipes, covering seamless and welded (including resistance welded and furnace welded) pipes. A53 pipes come in a variety of different types and grades and are commonly used in applications such as machinery, pressure systems, and structural supports.

Youdaoplaceholder0 A53 schedule 40 pipe is the most commonly used specification. It has become the preferred specification in engineering and industrial fields due to its moderate wall thickness, stable performance and wide supply. Its outer diameter (OD) is the same as that of all Schedule pipes, and the wall thickness of Schedule 40 can ensure sufficient mechanical strength and pressure resistance (typical working pressure can reach several hundred pounds per square inch), without increasing excessive material cost and self-weight due to excessive thickness.

The following is the size specification of A53 schedule 40 pipe

NPS Designator	DN Designator	Outside Diameter	Inside Diameter	Wall Thickness	Nominal Weight (Mass) per unit Length
		(mm)	(mm)	(mm)	Plain End (kg/m)	Threads & Couplings (kg/m
1/8″	6	10.3	6.8	1.73	0.37	0.37
1/4″	8	13.7	9.2	2.24	0.63	0.63
3/8″	10	17.1	12.5	2.31	0.84	0.84
1/2″	15	21.3	15.8	2.77	1.27	1.27
3/4″	20	26.7	20.9	2.87	1.69	1.69
1″	25	33.4	26.6	3.38	2.5	2.5
1-1/4″	32	42.2	35.1	3.56	3.39	3.4
1-1/2″	40	48.3	40.9	3.68	4.05	4.04
2″	50	60.3	52.5	3.91	5.44	5.46
2-1/2″	65	73	62.7	5.16	8.63	8.67
3″	80	88.9	77.9	5.49	11.29	11.35
3-1/2″	90	101.6	90.1	5.74	13.57	13.71
4″	100	114.3	102.3	6.02	16.07	16.23
5″	125	141.3	158.2	6.55	21.77	22.07
6″	150	168.3	154.1	7.11	28.26	28.58
8″	200	219.1	202.7	8.18	42.55	43.73
10″	250	273	254.5	9.27	60.29	63.36
12″	300	323.8	304.8	9.52	73.78	76.21

Schedule 40 tubing is based on ASME B36.10M standard, with nominal diameters (NPS) ranging from ½ "to 24" and corresponding wall thicknesses. Take the common 2 "(outer diameter 2.375") pipe as an example. Schedule 40 has a wall thickness of 0.154 "(about 3.91 mm) and performs well in water, gas and steam systems under moderate pressure.

Meanwhile, Schedule40 tubes have the following advantages in manufacturing and installation:

Strong versatility: From ½ "to 8" (and even larger diameters), it almost covers all common piping systems and is convenient for matching with valves, flanges, joints and other pipe fittings.

Corrosion resistance: It can be protected by various methods such as hot-dip galvanizing and internal epoxy coating, and is suitable for water supply, gas transportation and outdoor structures.

Convenient processing: Consistent wall thickness and small dimensional tolerance, ensuring good consistency and sealing performance when processing, welding and threaded joints.

High cost performance: Compared with the thinner Schedule 10/20, Schedule 40 offers a higher safety margin; It is more economical than Schedule 80 and Schedule 160, and can balance intensity and cost.

Read more：Production process of A53 steel pipe