Pipe Size Chart

A pipe, unlike tubing, is typically measured and called out by nominal pipe size (NPS) or inside diameter, organized in a pipe size chart. NPS is a North American standard set of measurements that designate pipe diameter and pipe wall thickness (schedule). In comparison to pipe dimensions, measuring tubing is by the OUTSIDE DIAMETER, specified in decimal or fractional inches. In most applications, the pipe is offered in American standard sizes, which are used in aluminum, carbon steel, and stainless steel pipe. For pipe sizes .125” through 12”, NPS signifies nominal inside diameter. For sizes larger than 12”, NPS signifies the actual outside diameter of the pipe.

For engineers, the most important information about the pipe is the size, or the inside diameter, which is used for line sizing calculations. Increasing the schedule, or wall thickness, increases the mechanical strength of the pipe, allowing it to handle greater internal pressures.

Alcobra stocking schedules are as follows, in order of increasing thickness:

Pipe Dimensions & Schedule

As the pipe schedule changes, so does the internal diameter. The diameter ID can be calculated easily if the schedule is known. The pipe ID equals the pipe nominal bore or nominal diameter minus the wall thickness twice. For the purpose of standardization, the American National Standards Institute published ANSI B36.10, which broadened the range of available wall thicknesses to schedule 10 through schedule 160.

The schedule numbers indicate an approximate value of 1000 times pressure-stress ratios. Schedule = 1000 x (P/S) where P is the internal service pressure of the pipe (PSIG) and S is the ultimate tensile strength of the pipe material (psi).

Typical wall thickness tolerances are usually no more than 12.5% under the schedule specified, depending on the standards used in the pipe’s manufacture. The dimensions in the table below may vary +/- a few thousandths. Please contact us with any other questions you may have regarding available pipe sizes you may be interested in.

0.125"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
0.405	40	0.068	0.269	T304/T316	6061
0.405	80	0.095	0.215

0.25"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
0.54	40	0.088	0.364	T304/T316	6061
0.54	80	0.119	0.302

0.375"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
0.675	40	0.091	0.493	T304/T316	6061
0.675	80	0.126	0.423

0.5"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
0.84	40	0.109	0.622	T304/T316	6061/6063
0.84	80	0.147	0.546	T304/T316	6061

0.75"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
1.05	40	0.0113	0.824	T304	6061/6063
1.05	80	0.154	0.742	T304/T316	6061
	160	0.218	0.612
	XXHY	0.308	0.434

1"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
1.315		0.083	1.149
1.315		0.095	1.125
1.315	10	0.109	1.097
1.315		0.125	1.065
1.315	40	0.133	1.049	T304/T316	6061/6063
1.315	80	0.179	0.957	T304	6061
1.315	XXHY	0.358	0.599

1.25"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
1.66	5	0.065	1.53
1.66		0.095	1.47
1.66	10	0.109	1.442
1.66		0.125	1.41
1.66	40	0.14	1.38	T304/T316	6061/6063
1.66	80	0.191	1.278		6061
1.66	160	0.25	1.16
1.66	XXHY	0.382	0.896

1.5"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
1.9	5	0.065	1.774
1.9	10	0.109	1.682
1.9		0.125	1.65
1.9	40	0.145	1.61	T304	6061/6063
1.9	80	0.2	1.5	T304	6061
1.9	160	0.281	1.338
1.9	XXHY	0.4	1.1

2"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
2.375	5	0.065	2.245
2.375	10	0.109	2.157	T304
2.375	40	0.154	2.067	T304	6061/6063
2.375	80	0.218	1.939	T304/T316	6061
2.375	160	0.343	1.687
2.375	XXHY	0.436	1.5

2.5"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
2.875	5	0.083	2.709
2.875	10	0.12	2.635
2.875		0.156	2.563
2.875	40	0.203	2.469	T304/T316	6061/6063
2.875		0.25	2.375
2.875	80	0.276	2.323	T304	6061
2.875	160	0.375	2.125
2.875	XXHY	0.552	1.771

3"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
3.5	5	0.078	3.344
3.5	10	0.120	3.26	T304
3.5		0.188	3.124
3.5	40	0.216	3.068	T304/T316	6061/6063
3.5		0.281	2.938
3.5	80	0.3	2.9		6061
3.5	160	0.437	2.624
3.5	XXHY	0.6	2.3

3.5"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
4	5	0.083	3.834
4	10	0.12	3.76	T304
4	40	0.226	3.548	T304/T316	6061/6063
4		0.25	3.5
4	80	0.318	3.364		6061
4	XXHY	0.636	2.728

4"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
4.5	5	0.083	4.334
4.5	10	0.12	4.26	T304
4.5		0.203	4.094
4.5	40	0.237	4.026	T304/T316	6061
4.5	60	0.281	3.938
4.5		0.312	3.876
4.5	80	0.337	3.826	T304	6061
4.5	120	0.438	3.624
4.5	160	0.531	3.438
4.5	XXHY	0.674	3.152

5"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
5.563	5	0.109	5.345
5.563	10	0.134	5.313
5.563	40	0.258	5.047	T304/T316	6061/6063
5.563		0.312	4.939
5.563	80	0.375	4.813
5.563	120	0.5	4.563
5.563	160	0.625	4.313
5.563	XXHY	0.75	4.06

6"

O.D.	Sch #	Wall	I.D.	Stainless	Aluminum
6.625		0.094	6.437
6.625	5	0.109	6.407
6.625	10	0.134	6.357
6.625		0.141	6.343
6.625		0.25	6.125
6.625	40	0.28	6.065	T304/T316	6061/6063
6.625		0.344	5.937
6.625	80	0.432	5.761	T304/T316	6061/6063
6.625		0.5	5.625
6.625	120	0.562	5.501
6.625		0.625	5.375
6.625	160	0.719	5.187
6.625	XXHY	0.864	4.897
6.625		1.125	4.375

8"

O.D.	Sch #	Wall	I.D.	Aluminum
8.625	5	0.109	8.407
8.625		0.12	8.385
8.625		0.141	8.343
8.625	10	0.148	8.329
8.625	20	0.25	8.125
8.625	30	0.277	8.071
8.625	40	0.322	7.981	6061
8.625		0.375	7.875
8.625	60	0.406	7.813
8.625		0.438	7.749
8.625	80	0.5	7.625
8.625		0.562	7.501
8.625	100	0.593	7.437
8.625	120	0.719	7.187
8.625	140	0.812	7.001
8.625	XXHY	0.875	6.875
8.625	160	0.906	6.813

10"

O.D.	Sch #	Wall	I.D.
10.75	5	0.134	10.48
10.75	10	0.165	10.42
10.75		0.188	10.374
10.75		0.237	10.276
10.75	20	0.25	10.25
10.75		0.279	10.192
10.75	30	0.307	10.136
10.75	40	0.365	10.02
10.75		0.375	10
10.75	60	0.5	9.75
10.75		0.562	9.626
10.75	80	0.593	9.562
10.75		0.625	9.5
10.75	100	0.719	9.312
10.75		0.812	9.126
10.75	120	0.844	9.062
10.75	140/XXHY	1	8.75
10.75	160	1.125	8.5

12"

O.D.	Sch #	Wall	I.D.
12.75		0.172	12.406
12.75		0.219	12.312
12.75	20	0.25	12.25
12.75	30	0.33	12.09
12.75		0.344	12.062
12.75	STD	0.375	12
12.75	40	0.406	11.938
12.75	XHY	0.5	11.75
12.75	60	0.562	11.626
12.75	80	0.688	11.374
12.75		0.75	11.25
12.75	100	0.84	11.062
12.75	120/XXHY	1	10.75
12.75	140/XXHY	1.125	10.5
12.75	160	1.312	10.126

14"

O.D.	Sch #	Wall	I.D.
14		0.237	13.526
14	10	0.25	13.5
14		0.281	13.438
14	20	0.312	13.376
14		0.344	13.312
14	30	0.375	13.25
14	40	0.438	13.124
14		0.459	13.082
14	XHY	0.5	13
14	60	0.594	12.812
14	80	0.75	12.5
14		0.812	12.376
14	100	0.938	12.124
14	120	1.094	11.812
14	140/XXHY	1.25	11.5
14	160	1.406	11.188

16"

O.D.	Sch #	Wall	I.D.
16	10	0.25	15.5
16		0.281	15.438
16	20	0.312	15.376
16		0.344	15.312
16	30	0.375	15.25
16		0.406	15.188
16		0.469	15.062
16	40/XHY	0.5	15
16		0.562	14.876
16	60	0.656	14.688
16	80	0.844	14.376
16	100	1.031	13.938
16	120	1.219	13.562
16	140/XXHY	1.438	13.124
16	160	1.594	12.812