Copper Water and Gas Tube according ASTM B 88M - metric units

Dimensions of copper tubes according ASTM B88M STANDARD SPECIFICATION FOR SEAMLESS COPPER WATER TUBE (METRIC) can be found in the table below:

Type A
Nominal Size Outside Diameter (mm)	Wall Thickness (mm)	Tolerance +/- Maximum Deviation at any Point (mm)	Weight (kg/m)
6	0.9	0.08	0.12
8	0.9	0.09	0.18
10	0.9	0.09	0.23
12	1.2	0.1	0.36
15	1.2	0.1	0.47
18	1.2	0.1	0.57
22	1.6	0.15	0.92
28	1.6	0.15	1.19
35	1.6	0.15	1.50
42	1.8	0.2	2.03
54	2.1	0.2	3.06
67	2.4	0.25	4.35
79	2.8	0.3	5.99
105	3.4	0.35	9.70
130	4.0	0.4	14.2
156	4.8	0.5	20.3
206	6.8	0.7	38.0
257	8.5	0.85	59.3
308	10.3	1	86.1

Type B
Nominal Size Outside Diameter (mm)	Wall Thickness (mm)	Tolerance +/- Maximum Deviation at any Point (mm)	Weight (kg/m)
6	0.7	0.07	0.10
8	0.8	0.08	0.16
10	0.8	0.08	0.21
12	0.9	0.09	0.28
15	1.0	0.1	0.39
18	1.0	0.1	0.48
22	1.1	0.1	0.65
28	1.2	0.1	0.90
35	1.4	0.15	1.32
42	1.5	0.15	1.71
54	1.7	0.15	2.50
67	2.0	0.15	3.65
79	2.3	0.2	4.95
105	2.8	0.25	8.04
130	3.1	0.3	11.0
156	3.5	0.3	15.0
206	5.0	0.35	28.2
257	6.3	0.5	44.4
308	7.1	0.65	60.0

Type C
Nominal Size Outside Diameter (mm)	Wall Thickness (mm)	Tolerance +/- Maximum Deviation at any Point (mm)	Weight (kg/m)
6	0.6	-	0.09
8	0.6	-	0.13
10	0.6	-	0.16
12	0.6	0.06	0.19
15	0.7	0.07	0.28
18	0.7	0.07	0.34
22	0.8	0.08	0.48
28	0.9	0.09	0.69
35	1.1	0.1	1.05
42	1.2	0.1	1.37
54	1.5	0.15	2.21
67	1.6	0.15	2.94
79	1.8	0.2	3.90
105	2.4	0.25	6.92
130	2.7	0.25	9.65
156	3.1	0.3	13.3
206	4.3	0.45	24.4
257	5.4	0.55	38.2
308	6.4	0.65	54.2

•   * 1 mm = 0.0394 in

The B88M specification covers seamless copper water tube suitable for general plumbing, similar applications for the conveyance of fluids, and commonly used with solder, flared, or compression-type fittings. The type of copper water tube suitable for any particular application is determined by the internal or external fluid pressure, by the installation and service conditions, and by local requirements. Means of joining or bending are also factors that affect the selection of the type of tube to be used.

• *Annealed tube is suitable for use with flared or compression fittings, and with solder-type fittings,   
•  provided rounding and sizing of the tube ends is performed where needed.

• *Drawn temper tube is suitable for use with solder-type fittings. Types A and B tube, in the drawn 
•   temper, are suitable for use with certain types and sizes of compression fittings.

This specification is the metric companion of Specification B 88.

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