Selecting the correct casing dimensions and weight is one of the most important decisions in oil and gas well construction. Casing provides structural support for the wellbore, prevents formation collapse, isolates underground zones, and protects groundwater throughout drilling and production. Choosing the wrong casing size or weight can reduce well integrity, increase operational risks, and lead to higher project costs.
In this guide, you'll find a comprehensive casing dimensions and weight chart based on API 5CT standards, along with practical information on casing sizes, weight designations, and selection considerations for various drilling and production environments.
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Labels
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Labels
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Outside diameter D
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Nominal linear mass T&C
|
Wall thickness t
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Inside diameter d
|
Drift diameter
|
Plain end
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Round thread Short
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Round thread Long
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Buttress thread RC
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Calculated mass C: Mass gain or loss due to end finishing (lb) - Buttress thread SCC
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1
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2.00
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D (in)
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lb/ft
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t (in)
|
d (in)
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in
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lb/ft
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Short
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Long
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RC
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SCC
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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4 1/2
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9.50
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4.500
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9.50
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0.205
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4.090
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3.965
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9.41
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4.20
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4 1/2
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10.50
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4.500
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10.50
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0.224
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4.052
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3.927
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10.24
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3.80
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5.00
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2.56
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4 1/2
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11.60
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4.500
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11.60
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0.250
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4.000
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3.875
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11.36
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3.40
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3.80
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4.60
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2.16
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4 1/2
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13.50
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4.500
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13.50
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0.290
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3.920
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3.795
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13.05
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3.20
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4.00
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1.56
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4 1/2
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15.10
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4.500
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15.10
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0.337
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3.826
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3.701
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15.00
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2.80
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3.20
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0.76
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5
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11.50
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5.000
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11.50
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0.220
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4.560
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4.435
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11.24
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5.40
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5
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13.00
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5.000
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13.00
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0.253
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4.494
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4.369
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12.84
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4.80
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5.80
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6.60
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2.42
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5
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15.00
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5.000
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15.00
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0.296
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4.408
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4.283
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14.88
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4.20
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5.20
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5.80
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1.62
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5
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18.00
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5.000
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18.00
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0.362
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4.276
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4.151
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17.95
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4.20
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4.40
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0.22
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5
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21.40
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5.000
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21.40
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0.437
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4.126
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4.001
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21.32
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2.95
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2.46
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-1.72
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5
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23.20
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5.000
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23.20
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0.478
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4.044
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3.919
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23.11
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2.30
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2.05
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-2.09
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5
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24.10
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5.000
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24.10
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0.500
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4.000
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3.875
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24.05
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1.95
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1.24
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-2.94
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5 1/2
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14.00
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5.500
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14.00
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0.244
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5.015
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4.887
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13.71
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5.40
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5 1/2
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15.50
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5.500
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15.50
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0.275
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4.950
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4.825
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15.36
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4.80
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5.80
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6.40
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2.10
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5 1/2
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17.00
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5.500
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17.00
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0.304
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4.892
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4.767
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16.89
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4.40
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5.40
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5.80
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1.50
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5 1/2
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20.00
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5.500
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20.00
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0.361
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4.778
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4.653
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19.83
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4.40
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4.60
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0.30
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5 1/2
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23.00
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5.500
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23.00
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0.415
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4.670
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4.545
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22.56
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3.20
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3.40
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0.90
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5 1/2
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26.80
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5.500
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26.80
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0.500
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4.500
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4.375
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26.72
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5 1/2
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29.70
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5.500
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29.70
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0.562
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4.376
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4.251
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29.67
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5 1/2
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32.60
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5.500
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32.60
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0.625
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4.250
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4.125
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32.57
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5 1/2
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35.30
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5.500
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35.30
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0.687
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4.126
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4.001
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35.35
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5 1/2
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38.00
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5.500
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38.00
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0.750
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4.000
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3.875
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38.08
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5 1/2
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40.50
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5.500
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40.50
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0.812
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3.876
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3.751
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40.69
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5 1/2
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43.10
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5.500
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43.10
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0.875
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3.750
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3.625
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43.26
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6 5/8
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20.00
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6.625
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20.00
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0.288
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6.049
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5.924
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19.51
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11.00
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13.60
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14.40
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2.38
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6 5/8
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24.00
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6.625
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24.00
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0.352
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5.921
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5.796
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23.60
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9.60
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12.00
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12.60
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0.58
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6 5/8
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28.00
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6.625
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28.00
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0.417
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5.791
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5.666
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27.67
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10.20
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10.60
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-1.42
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6 5/8
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32.00
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6.625
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32.00
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0.475
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5.675
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5.550
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31.23
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8.80
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9.00
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-3.02
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7
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17.00
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7.000
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17.00
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0.231
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6.538
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6.413
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16.72
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10.00
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7
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20.00
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7.000
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20.00
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0.272
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6.456
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6.331
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19.56
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9.40
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7
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23.00
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7.000
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23.00
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0.317
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6.366
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6.250
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22.65
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8.00
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10.40
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11.00
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160
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7
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23.00
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7.000
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23.00
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0.317
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6.366
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6.241
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22.65
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8.00
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10.40
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11.00
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1.60
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7
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26.00
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7.000
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26.00
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0.362
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6.276
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6.151
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25.69
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7.20
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9.40
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9.60
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0.20
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7
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29.00
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7.000
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29.00
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0.408
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6.184
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6.059
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28.75
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8.00
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8.20
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1.20
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7
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32.00
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7.000
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32.00
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0.453
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6.094
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6.000
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31.70
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6.60
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6.80
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2.60
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7
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32.00
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7.000
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32.00
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0.453
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6.094
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5.969
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31.70
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6.60
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6.80
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2.60
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7
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35.00
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7.000
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35.00
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0.498
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6.004
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5.879
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34.61
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5.60
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5.60
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3.80
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7
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38.00
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7.000
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38.00
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0.540
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5.920
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5.795
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37.29
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4.40
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4.20
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5.20
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7
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42.70
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7.000
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42.70
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0.625
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5.750
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5.625
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42.59
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7
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46.40
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7.000
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46.40
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0.687
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5.625
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5.500
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46.36
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7
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50.10
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7.000
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50.10
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0.750
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5.500
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5.375
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50.11
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7
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53.60
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7.000
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53.60
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0.812
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5.376
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5.251
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53.71
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7
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57.10
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7.000
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57.10
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0.875
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5.376
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5.125
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57.29
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Labels
|
Labels
|
Outside diameter D
|
Nominal linear mass T&C
|
Wall thickness t
|
Inside diameter d
|
Drift diameter
|
Plain end
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Round thread Short
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Round thread Long
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Buttress thread RC
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Buttress thread SCC
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1
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2.00
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D (in)
|
lb/ft
|
t (in)
|
d (in)
|
in
|
lb/ft
|
Short
|
Long
|
RC
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SCC
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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7 5/8
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24.00
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7.625
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24.00
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0.300
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7.025
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6.900
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23.49
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15.80
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7 5/8
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26.40
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7.625
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26.40
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0.328
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6.969
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6.844
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25.59
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15.20
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19.00
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20.60
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6.21
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7 5/8
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29.70
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7.625
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29.70
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0.375
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6.875
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6.750
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29.06
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17.40
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18.80
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4.41
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7 5/8
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33.70
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7.625
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33.70
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0.430
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6.765
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6.640
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33.07
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15.80
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17.00
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2.61
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7 5/8
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39.00
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7.625
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39.00
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0.500
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6.625
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6.500
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38.08
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13.60
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14.60
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0.21
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7 5/8
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42.80
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7.625
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42.80
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0.562
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6.501
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6.376
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42.43
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|
12.01
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11.39
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-3.01
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7 5/8
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45.30
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7.625
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45.30
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0.595
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6.435
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6.310
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44.71
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|
11.04
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11.04
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-3.36
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7 5/8
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47.10
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7.625
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47.10
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0.625
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6.375
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6.250
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46.77
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10.16
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9.23
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-5.17
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7 5/8
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51.20
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7.625
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51.20
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0.687
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6.251
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6.126
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50.95
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|
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7 5/8
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55.30
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7.625
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55.30
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0.750
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6.125
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6.000
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55.12
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7 3/4
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46.10
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7.750
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46.10
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0.595
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6.560
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6.500
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45.51
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|
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7 3/4
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46.10
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7.750
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46.10
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0.595
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6.560
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6.435
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45.51
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|
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8 5/8
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24.00
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8.625
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24.00
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0.264
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8.097
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7.972
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23.60
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23.60
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|
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8 5/8
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28.00
|
8.625
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28.00
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0.304
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8.017
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7.892
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27.04
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22.20
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|
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8 5/8
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32.00
|
8.625
|
32.00
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0.352
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7.921
|
7.875
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31.13
|
20.80
|
27.60
|
28.30
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6.03
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8 5/8
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32.00
|
8.625
|
32.00
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0.352
|
7.921
|
7.796
|
31.13
|
20.80
|
27.60
|
28.20
|
6.03
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8 5/8
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36.00
|
8.625
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36.00
|
0.400
|
7.825
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7.700
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35.17
|
19.40
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25.60
|
26.20
|
4.03
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8 5/8
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40.00
|
8.625
|
40.00
|
0.450
|
7.725
|
7.625
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39.33
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|
23.80
|
24.20
|
2.03
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8 5/8
|
40.00
|
8.625
|
40.00
|
0.450
|
7.725
|
7.600
|
39.33
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|
23.80
|
24.20
|
2.03
|
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8 5/8
|
44.00
|
8.625
|
44.00
|
0.500
|
7.625
|
7.500
|
43.43
|
|
21.80
|
22.20
|
0.03
|
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8 5/8
|
49.00
|
8.625
|
49.00
|
0.557
|
7.511
|
7.286
|
48.04
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|
19.60
|
19.80
|
-2.37
|
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9 5/8
|
32.30
|
9.625
|
32.30
|
0.312
|
9.001
|
8.845
|
31.06
|
24.40
|
|
|
|
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9 5/8
|
36.00
|
9.625
|
36.00
|
0.352
|
8.921
|
8.876
|
34.89
|
23.00
|
32.00
|
31.00
|
6.48
|
|
9 5/8
|
40.00
|
9.625
|
40.00
|
0.395
|
8.835
|
8.750
|
38.97
|
21.40
|
30.00
|
29.00
|
4.48
|
|
9 5/8
|
40.00
|
9.625
|
40.00
|
0.395
|
8.835
|
8.679
|
38.97
|
21.40
|
30.00
|
29.00
|
4.48
|
|
9 5/8
|
43.50
|
9.625
|
43.50
|
0.435
|
8.755
|
8.599
|
42.73
|
|
28.20
|
27.20
|
2.68
|
|
9 5/8
|
47.00
|
9.625
|
47.00
|
0.472
|
8.681
|
8.525
|
46.18
|
|
26.60
|
25.60
|
1.08
|
|
9 5/8
|
53.50
|
9.625
|
53.50
|
0.545
|
8.535
|
8.500
|
52.90
|
|
23.40
|
22.40
|
-2.12
|
|
9 5/8
|
53.50
|
9.625
|
53.50
|
0.545
|
8.535
|
8.379
|
52.90
|
|
23.40
|
22.40
|
-2.12
|
|
9 5/8
|
58.40
|
9.625
|
58.40
|
0.595
|
8.435
|
8.375
|
57.44
|
|
21.50
|
20.13
|
-4.40
|
|
9 5/8
|
58.40
|
9.625
|
58.40
|
0.595
|
8.435
|
8.279
|
57.44
|
|
21.50
|
20.13
|
-4.40
|
|
9 5/8
|
59.40
|
9.625
|
59.40
|
0.609
|
8.407
|
8.251
|
58.70
|
|
|
|
|
|
9 5/8
|
64.90
|
9.625
|
64.90
|
0.672
|
8.281
|
8.125
|
64.32
|
|
|
|
|
|
9 5/8
|
70.30
|
9.625
|
70.30
|
0.734
|
8.157
|
8.001
|
69.76
|
|
|
|
|
|
9 5/8
|
75.60
|
9.625
|
75.60
|
0.797
|
8.031
|
7.875
|
75.21
|
|
|
|
|
|
10 3/4
|
32.75
|
10.750
|
32.75
|
0.279
|
10.192
|
10.036
|
31.23
|
29.00
|
|
|
|
|
10 3/4
|
40.50
|
10.750
|
40.50
|
0.350
|
10.050
|
9.894
|
38.91
|
26.40
|
|
34.40
|
7.21
|
|
10 3/4
|
45.50
|
10.750
|
45.50
|
0.400
|
9.950
|
9.875
|
44.26
|
24.40
|
|
31.80
|
4.61
|
|
10 3/4
|
45.50
|
10.750
|
45.50
|
0.400
|
9.950
|
9.794
|
44.26
|
24.40
|
|
31.80
|
4.61
|
|
10 3/4
|
51.00
|
10.750
|
51.00
|
0.450
|
9.850
|
9.694
|
49.55
|
22.60
|
|
29.40
|
2.21
|
|
10 3/4
|
55.50
|
10.750
|
55.50
|
0.495
|
9.760
|
9.625
|
54.26
|
20.80
|
|
27.00
|
-0.19
|
|
10 3/4
|
55.50
|
10.750
|
55.50
|
0.495
|
9.760
|
9.604
|
54.26
|
20.80
|
|
27.00
|
-0.19
|
|
10 3/4
|
60.70
|
10.750
|
60.70
|
0.545
|
9.660
|
9.504
|
59.45
|
18.80
|
|
24.40
|
|
|
10 3/4
|
65.70
|
10.750
|
65.70
|
0.595
|
9.560
|
9.404
|
64.59
|
16.80
|
|
22.00
|
|
|
10 3/4
|
73.20
|
10.750
|
73.20
|
0.672
|
9.406
|
9.250
|
72.40
|
|
|
|
|
|
10 3/4
|
79.20
|
10.750
|
79.20
|
0.734
|
9.282
|
9.126
|
78.59
|
|
|
|
|
|
10 3/4
|
85.30
|
10.750
|
85.30
|
0.797
|
9.156
|
|
|
|
|
|
|
|
Labels
|
Labels
|
Outside diameter D
|
Nominal linear mass T&C
|
Wall thickness t
|
Inside diameter d
|
Drift diameter
|
Plain end
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Round thread Short
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Round thread Long
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Buttress thread RC
|
Calculated mass C: Mass gain or loss due to end finishing (lb) - Buttress thread SCC
|
|
1
|
2
|
D (in)
|
lb/ft
|
t (in)
|
d (in)
|
in
|
lb/ft
|
Short
|
Long
|
RC
|
SCC
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
|
11 3/4
|
42
|
11.75
|
42
|
0.333
|
11.084
|
11
|
40.64
|
29.6
|
|
|
|
|
11 3/4
|
42
|
11.75
|
42
|
0.333
|
11.084
|
10.928
|
40.64
|
29.6
|
|
|
|
|
11 3/4
|
47
|
11.75
|
47
|
0.375
|
11
|
10.844
|
45.6
|
27.6
|
|
35.8
|
|
|
11 3/4
|
54
|
11.75
|
54
|
0.435
|
10.88
|
10.724
|
52.62
|
25
|
|
32.4
|
|
|
11 3/4
|
60
|
11.75
|
60
|
0.489
|
10.772
|
10.625
|
58.87
|
22.6
|
|
29.6
|
|
|
11 3/4
|
60
|
11.75
|
60
|
0.489
|
10.772
|
10.616
|
58.87
|
22.6
|
|
29.6
|
|
|
11 3/4
|
65
|
11.75
|
65
|
0.534
|
10.682
|
10.625
|
64.03
|
|
|
|
|
|
11 3/4
|
65
|
11.75
|
65
|
0.534
|
10.682
|
10.625
|
64.03
|
|
|
|
|
|
11 3/4
|
71
|
11.75
|
71
|
0.582
|
10.586
|
10.43
|
69.48
|
|
|
|
|
|
13 3/8
|
48
|
13.375
|
48
|
0.33
|
12.715
|
12.559
|
46.02
|
33.2
|
|
|
|
|
13 3/8
|
54.5
|
13.375
|
54.5
|
0.38
|
12.615
|
12.459
|
52.79
|
30.8
|
|
40.2
|
|
|
13 3/8
|
61
|
13.375
|
61
|
0.43
|
12.515
|
12.359
|
59.5
|
28.4
|
|
36.8
|
|
|
13 3/8
|
68
|
13.375
|
68
|
0.48
|
12.415
|
12.259
|
66.17
|
25.8
|
|
33.6
|
|
|
13 3/8
|
72
|
13.375
|
72
|
0.514
|
12.347
|
12.25
|
70.67
|
24.2
|
|
31.6
|
|
|
13 3/8
|
72
|
13.375
|
72
|
0.514
|
12.347
|
12.191
|
70.67
|
24.2
|
|
31.6
|
|
|
16
|
65
|
16
|
65
|
0.375
|
15.25
|
15.062
|
62.64
|
42.6
|
|
|
|
|
16
|
75
|
16
|
75
|
0.438
|
15.124
|
14.936
|
72.86
|
38.2
|
|
45.6
|
|
|
16
|
84
|
16
|
84
|
0.495
|
15.01
|
14.822
|
82.05
|
34.2
|
|
39.6
|
|
|
16
|
109
|
16
|
109
|
0.656
|
14.688
|
14.5
|
107.6
|
|
|
|
|
|
18 5/8
|
87.5
|
18.625
|
87.5
|
0.435
|
17.755
|
17.567
|
84.59
|
73.6
|
|
86.4
|
|
|
20
|
94
|
20
|
94
|
0.438
|
19.124
|
18.936
|
91.59
|
47
|
61.2
|
54.8
|
|
|
20
|
106.5
|
20
|
106.5
|
0.5
|
19
|
18.812
|
104.23
|
41.6
|
54.8
|
48.4
|
|
|
20
|
133
|
20
|
133
|
0.635
|
18.73
|
18.542
|
131.45
|
30
|
40.6
|
35.2
|
|
Conclusion
Understanding a casing dimensions and weight chart is essential for designing safe, efficient, and cost-effective oil and gas wells. Whether your project involves onshore drilling, offshore platforms, shale gas development, or deep wells, choosing the correct casing dimensions helps improve well integrity, reduce operational risks, and ensure long-term reliability.
At Union Steel Industry, we supply high-quality API 5CT casing pipes in a wide range of sizes, weights, steel grades, and premium connections. Every casing product undergoes strict quality control, dimensional inspection, and mechanical testing to ensure compliance with international standards and demanding field conditions.
FAQ
1. What is a casing dimensions and weight chart?
It is a reference table showing API casing sizes, outside diameters, wall thicknesses, and nominal weights.
2. Which standard covers casing dimensions?
Most oilfield casing dimensions are specified according to API 5CT.
3. How is casing weight expressed?
Casing weight is typically measured in lb/ft or kg/m, depending on the standard used.
4. Why is casing weight important?
It affects the pipe's strength, collapse resistance, and suitability for different well conditions.
5. What are the most common casing sizes?
Common sizes include 4½", 5½", 7", 9⅝", 13⅜", and 20", depending on the drilling application.
6. How do I choose the right casing size?
Select the size based on well depth, pressure requirements, formation conditions, and API specifications.
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