Tube ID (Inner Diameter) Smart Chart Reference

Whether you’re selecting the right tools for maintenance or ensuring proper specifications for replacement, use this tubing ID chart to determine what size you need. This chart uses the inner diameter of the tube and the wall thickness to help you know what size you need. Ranging from 3/8 inch tubes all the way to 4 inches, quickly find the size that you need.

GA	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24
Wall:	.340	.300	.284	.259	.238	.220	.230	.180	.156	.148	.134	.120	.109	.095	.083	.072	.065	.058	.049	.042	.035	.032	.028	.025	.022

OD (Inch)	Tube ID (Inner Diameter) In Decimal Inches
3/8									.045	.079	.107	.135	.175	.185	.209	.231	.245	.259	.277	.291	.305	.311	.319	.312	.331
1/2					.024	.060	.094	.140	.170	.204	.232	.260	.282	.310	.334	.356	.370	.384	.402	.416	.430	.436	.444	.450	.456
5/8		.025	.057	.107	.149	.185	.219	.265	.295	.329	.357	.385	.407	.435	.459	.481	.495	.509	.527	.541	.555	.561	.569	.575	.581
3/4	.070	.150	.182	.232	.274	.310	.344	.390	.420	.454	.482	.510	.532	.560	.584	.606	.620	.634	.652	.666	.680	.686	.694	.700	.706
7/8	.195	.275	.307	.357	.399	.435	.469	.515	.545	.579	.607	.635	.657	.685	.709	.731	.745	.759	.777	.791	.805	.811	.819	.825	.831
1	.320	.400	.432	.482	.524	.560	.594	.640	.670	.704	.732	.760	.782	.810	.834	.854	.870	.884	.902	.916	.930	.936	.944	.950	.956
1 1/4	.570	.650	.682	.732	.774	.810	.844	.890	.920	.954	.982	1.010	1.032	1.060	1.084	1.106	1.120	1.134	1.152	1.166	1.180
1 1/2	.820	.900	.932	.982	1.024	1.060	1.094	1.140	1.170	1.204	1.232	1.260	1.282	1.310	1.334	1.356	1.370	1.384	1.402	1.426	1.430
2	1.320	1.400	1.432	1.482	1.524	1.560	1.594	1.640	1.670	1.704	1.732	1.760	1.782	1.810	1.834	1.856	1.870	1.884	1.902	1.916	1.930
2 1/2	1.820	1.900	1.932	1.982	2.024	2.060	2.094	2.140	2.170	2.204	2.232	2.260	2.282	2.310	2.334	2.356	2.370	2.384	2.402	2.416	2.430
3	2.230	2.400	2.432	2.482	2.524	2.560	2.594	2.640	2.670	2.704	2.732	2.760	2.782	2.810	2.834	2.856	2.870	2.884	2.902	2.916	2.930
4	3.320	3.400	3.432	3.482	3.524	3.560	3.594	3.640	3.670	3.704	3.732	3.760	3.782	3.810	3.834	3.856	3.870	3.884	3.902	3.916	3.930

Frequently Asked Questions

1. How do I use this chart to find the correct tube ID?
To determine the tube’s inner diameter (ID), locate the tube’s outer diameter (OD) in the left column. Then, find the wall thickness in the “Wall” row. The intersection of these values in the chart provides the tube’s ID in decimal inches.

2. What if the exact dimensions I need are not listed?
If your exact dimensions aren’t listed, use the closest match for reference. For custom or less common specifications, feel free to contact TC Wilson for additional guidance or solutions tailored to your needs.

3. Why is tube ID important in boiler maintenance?
The tube ID is critical for selecting the right tools, ensuring a proper fit, and maintaining optimal performance in boiler systems. Using accurate dimensions helps prevent damage and ensures effective cleaning, repair, and replacement.