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Copper Tubes - ASTM B88

Copper Water and Gas Tube according ASTM B 88 - imperial units

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Dimensions of copper tubes according ASTM B88 STANDARD SPECIFICATION FOR SEAMLESS COPPER WATER TUBE can be found in the table below:

Type K
Nominal Size
(inches)		 Actual Outside Diameter
(inches)		 Tolerance on Outside Diameter
(inches) 		Wall Thickness
(inches)
Annealed1) Drawn2) Nominal Tolerance
1/4 3/8 0.375 0.002 0.001 0.035 0.0035
3/8 1/2 0.500 0.0025 0.001 0.049 0.005
1/2 5/8 0.625 0.0025 0.001 0.049 0.005
5/8 3/4 0.750 0.0025 0.001 0.049 0.005
3/4 7/8 0.875 0.003 0.001 0.065 0.006
1 1 1/8 1.125 0.0035 0.0015 0.065 0.006
1 1/4 1 3/8 1.375 0.004 0.0015 0.065 0.006
1 1/2 1 5/8 1.625 0.0045 0.002 0.072 0.007
2 2 1/8 2.125 0.005 0.002 0.083 0.008
2 1/2 2 5/8 2.625 0.005 0.002 0.095 0.010
3 3 1/8 3.125 0.005 0.002 0.109 0.011
3 1/2 3 5/8 3.625 0.005 0.002 0.120 0.012
4 4 1/8 4.125 0.005 0.002 0.134 0.013
5 5 1/8 5.125 0.005 0.002 0.160 0.016
6 6 1/8 6.125 0.005 0.002 0.192 0.019

Type L
Nominal Size
(inches)		 Actual Outside Diameter
(inches)		 Tolerance on Outside Diameter
(inches)		 Wall Thickness
(inches)
Annealed1) Drawn2) Nominal Tolerance
1/4 3/8 0.375 0.002 0.001 0.030 0.003
3/8 1/2 0.500 0.0025 0.001 0.035 0.004
1/2 5/8 0.625 0.0025 0.001 0.040 0.004
5/8 3/4 0.750 0.0025 0.001 0.042 0.004
3/4 7/8 0.875 0.003 0.001 0.045 0.004
1 1 1/8 1.125 0.0035 0.0015 0.050 0.005
1 1/4 1 3/8 1.375 0.004 0.0015 0.055 0.006
1 1/2 1 5/8 1.625 0.0045 0.002 0.060 0.006
2 2 1/8 2.125 0.005 0.002 0.070 0.007
2 1/2 2 5/8 2.625 0.005 0.002 0.080 0.008
3 3 1/8 3.125 0.005 0.002 0.090 0.009
3 1/2 3 5/8 3.625 0.005 0.002 0.100 0.010
4 4 1/8 4.125 0.005 0.002 0.114 0.011
5 5 1/8 5.125 0.005 0.002 0.125 0.012
6 6 1/8 6.125 0.005 0.002 0.140 0.014

Type M
Nominal Size
(inches)		 Actual Outside Diameter
(inches)		 Tolerance on Outside Diameter
(inches)		 Wall Thickness
(inches)
Annealed1) Drawn2) Nominal Tolerance
1/4 3/8 0.375 0.002 0.001
3/8 1/2 0.500 0.0025 0.001 0.025 0.002
1/2 5/8 0.625 0.0025 0.001 0.028 0.003
5/8 3/4 0.750 0.0025 0.001
3/4 7/8 0.875 0.003 0.001 0.032 0.003
1 1 1/8 1.125 0.0035 0.0015 0.035 0.004
1 1/4 1 3/8 1.375 0.004 0.0015 0.042 0.004
1 1/2 1 5/8 1.625 0.0045 0.002 0.049 0.005
2 2 1/8 2.125 0.005 0.002 0.058 0.006
2 1/2 2 5/8 2.625 0.005 0.002 0.065 0.006
3 3 1/8 3.125 0.005 0.002 0.072 0.007
3 1/2 3 5/8 3.625 0.005 0.002 0.083 0.008
4 4 1/8 4.125 0.005 0.002 0.095 0.010
5 5 1/8 5.125 0.005 0.002 0.109 0.011
6 6 1/8 6.125 0.005 0.002 0.122 0.012

1) 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.

2) 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. The standard length for drawn tubes are 20 ft (6.096 m).

The B88 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.

This specification is the imperial companion of Specification B 88M.

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