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ASTM B280 - Copper Tube for Air Conditioning and Refrigeration - ACR - Dimensions and Working Pressures

Standard specification for seamless copper tube for Air Conditioning and Refrigeration Field Service

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Seamless copper tube according ASTM B280 – Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service - is intended for use in the connection, repairs, or alternations of air conditioning or refrigeration units in the field.

ACR Copper Tubes is used in the Air Conditioning and Refrigeration Field Service Industry and is produced in straight lengths or coils.

Copper tube for air-conditioning and refrigeration field service (ACR) is designated by actual outside diameter.

Nominal Size
(inches)
Annealed (A) or Drawn Temper (D)Outside Diameter
(inches)

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Inside Diameter
(inches)

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Wall Thickness
(inches)

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Cross Sectional Area of Bore
(square inches)

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1/8 A 0.125 0.065 0.030 0.0033
3/16 A 0.187 0.128 0.030 0.0129
1/4 A 0.250 0.190 0.030 0.0284
5/16 A 0.312 0.248 0.032 0.0483
3/8 A 0.375 0.311 0.032 0.076
D 0.375 0.315 0.030 0.078
1/2 A 0.500 0.436 0.032 0.149
D 0.500 0.430 0.035 0.145
5/8 A 0.625 0.555 0.035 0.242
D 0.625 0.545 0.040 0.233
3/4 A 0.750 0.680 0.035 0.363
A 0.750 0.666 0.042 0.348
D 0.750 0.666 0.042 0.348
7/8 A 0.875 0.785 0.045 0.484
D 0.875 0.785 0.045 0.484
1 1/8 A 1.125 1.025 0.050 0.825
D 1.125 1.025 0.050 0.825
1 3/8 A 1.375 1.265 0.055 1.26
D 1.375 1.265 0.055 1.26

Temper describes the strength and hardness of the tube.

  • drawn temper - also called "hard" or "rigid"
  • annealed temper - also called "soft" or "flexible"

Working Pressures

Nominal Size
(inches)
Max. Working Pressure (psi)
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Annealed CoilsAnnealed Straight LengthsDrawn Straight Lengths
1/8 2613
3/16 1645
1/4 1195
5/19 1017
3/8 836 777 1524
1/2 618 664 1302
5/8 525 615 1206
3/4 435 538 1055
7/8 495 496 972
1 1/8 420 421 825
1 3/8 373 374 733
1 5/8 347 348 682
2 1/8 309 607
2 5/8 286 560
3 1/8 270 529
3 5/8 258 506
4 1/8 249 489

Ratings based on service temperature max. 150oF (66oC).

  • yield strength S = 5100 psi (35 GPa) for annealed tube
  • yield strength S = 10000 psi (69GPa) for drawn tube
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