Tube Size report

Yellow Tubes One of the reasons stainless steel tube is used in so many different ways is because it can be custom-manufactured in an extensive range of sizes and configurations. It is incredible to imagine that the same product can serve many potential purposes when its size changes. The measurements that come into play when choosing the ideal tubing size for any given application are wall thickness, inner diameter, and outer diameter.

You have probably heard pipe and tube used interchangeably but are they different. The answer to that question is yes! The most significant difference between pipe and tube is their shape. The pipe will always be round; however, the tube can be round, square, or rectangular.

Different tubes, especially steel tubes, stainless steel tubs, have numerous uses in our homes, including within our appliances, water, heating, and plumbing systems, in our cars, and in the tools we use. You will find more details about tube sizes by reading the following article.

Tube Size Guide

Round tube is specified by its actual outside diameter and is equal to the corresponding size. The thickness of tube is defined by a gauge number. Tube size will keep the same outer diameter no matter what the wall thickness is.

Tubes in different shape

Round Tube Size Chart

Dimensions of tubes belong to the essential characteristics of tubes. Three main dimensions measure them except for the length. The wall thickness (WT) of tubing can also be measured by the standard gauge from 0 (heaviest) to 24 (lightest), which corresponds to a range of wall thicknesses. These are the most popular and widely used tube dimensions in the industry. The outside diameter (OD), inside diameter (ID), and wall thickness (WT), specified in inches.

Gauge	Outer Diameter(mm)	Inner Diameter(mm)	Wall(mm)
5TW	0.219	0.199	0.010
5RW	0.219	0.189	0.015
6TW	0.203	0.183	0.010
6RW	0.203	0.173	0.015
7XT	0.180	0.166	0.007
7TW	0.180	0.160	0.010
7RW	0.180	0.150	0.015
8XT	0.165	0.150	0.0075
8TW	0.165	0.145	0.010
8RW	0.165	0.135	0.015
9XT	0.148	0.135	0.0065
9TW	0.148	0.128	0.010
9RW	0.148	0.118	0.015
10XT	0.134	0.118	0.008
10TW	0.134	0.114	0.010
10RW	0.134	0.106	0.014
11XT	0.120	0.106	0.007
11TW	0.120	0.100	0.010
11RW	0.120	0.094	0.013
12XT	0.109	0.095	0.007
12TW	0.109	0.091	0.009
12RW	0.109	0.085	0.012
13XT	0.095	0.085	0.005
13TW	0.095	0.077	0.009
13RW	0.095	0.071	0.012
14XT	0.083	0.072	0.0055
14TW	0.083	0.067	0.008
14RW	0.083	0.063	0.010
15TW	0.072	0.060	0.006
15RW	0.072	0.054	0.009
16XT	0.065	0.055	0.005
16TW	0.065	0.053	0.006
16RW	0.065	0.047	0.009
17XT	0.058	0.050	0.004
17TW	0.058	0.048	0.005
17RW	0.058	0.042	0.008
18XT	0.050	0.042	0.004
18TW	0.050	0.038	0.006
18RW	0.050	0.033	0.0085
19XT	0.042	0.035	0.0035
19TW	0.042	0.032	0.005
19RW	0.042	0.027	0.0075
20XT	0.0355	0.0275	0.004
20TW	0.0355	0.0255	0.005
20RW	0.0355	0.0235	0.006
21XT	0.032	0.025	0.0035
21TW	0.032	0.023	0.0045
21RW	0.032	0.020	0.006
22XT	0.028	0.021	0.0035
22TW	0.028	0.020	0.004
22RW	0.028	0.016	0.006
23TW	0.025	0.017	0.004
23RW	0.025	0.013	0.006
24TW	0.022	0.014	0.004
24RW	0.022	0.012	0.005
25TW	0.020	0.012	0.004
25RW	0.020	0.010	0.005
26TW	0.018	0.012	0.003
26RW	0.018	0.010	0.004
27TW	0.016	0.010	0.003
27RW	0.016	0.008	0.004
28TW	0.014	0.009	0.0025
28RW	0.014	0.007	0.0035
29RW	0.013	0.007	0.003
30RW	0.012	0.006	0.003
31RW	0.010	0.005	0.0025

Common Tubing Sizes

Tube Sizes

Outside Diameter (mm)	Outside Diameter (inch)	Wall Thickness (mm)	Wall Thickness (inch)
6.4 mm	1/4 inches	0.41 mm	0.016 inches
6.4 mm	1/4 inches	0.51 mm	0.020 inches
6.4 mm	1/4 inches	0.71 mm	0.028 inches
9.5 mm	3/8 inches	0.48 mm	0.019 inches
9.5 mm	3/8 inches	0.56 mm	0.022 inches
9.5 mm	3/8 inches	0.71 mm	0.028 inches
9.5 mm	3/8 inches	0.89 mm	0.035 inches
9.5 mm	3/8 inches	1.07 mm	0.042 inches
12.7 mm	1/2 inches	0.058 mm	0.023 inches
12.7 mm	1/2 inches	0.066 mm	0.026 inches
12.7 mm	1/2 inches	0.071 mm	0.028 inches
12.7 mm	1/2 inches	0.091 mm	0.036 inches
12.7 mm	1/2 inches	1.42 mm	0.056 inches
15.9 mm	5.8 inches	0.058 mm	0.023 inches
15.9 mm	5.8 inches	0.071 mm	0.028 inches
15.9 mm	5.8 inches	0.081 mm	0.032 inches
15.9 mm	5.8 inches	0.089 mm	0.035 inches
15.9 mm	5.8 inches	1.12 mm	0.044 inches
15.9 mm	5.8 inches	1.14 mm	0.049 inches

The above is not complete tube size information, and you should consult a professional salesperson for specific details when purchasing. Tubes of different materials have different specifications, and the size also varies from manufacturer to manufacturer. The above information is based on stainless steel and steel tubes.