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ASTM B88M - Seamless Copper Water Tubes - Metric Dimensions

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Dimensions of copper tubes according ASTM B88M Standard Specification for Seamless Copper Water Tube (Metric) are indicated in the table below.

ASTM B88M - Seamless Copper Water Tubes - Metric Dimensions - 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
.
ASTM B88M - Seamless Copper Water Tubes - Metric Dimensions - 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
ASTM B88M - Seamless Copper Water Tubes - Metric Dimensions - 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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