Well Casing
We provide buttress and round thread seamless casing pipes according to API 5CT. Our oil casing is produced by one of the largest OCTG manufacturers in China. Grades: J55, K55, N80, L80, C95, P110, H40. Well casing outer diameter ranging from 41/2" to 20".
API Casing Specifications
| Casing O.D (in) |
Grade |
Nominal Weight (lb/ft) |
Casing Wall Thickness (in) |
Inner Diameter (in) |
Casing Drift Diameter (in) |
Thread Coupled O.D (in) |
| 4 1/2 |
J55 |
10.50 |
0.224 |
4.025 |
3.927 |
5.000 |
| 4 1/2 |
K55 |
10.50 |
0.224 |
4.025 |
3.927 |
5.000 |
| 4 1/2 |
J55 |
11.60 |
0.25 |
4.00 |
3.875 |
5.000 |
| 4 1/2 |
K55 |
11.60 |
0.25 |
4.00 |
3.875 |
5.000 |
| 4 1/2 |
N80 |
11.60 |
0.25 |
4.00 |
3.875 |
5.000 |
| 4 1/2 |
L80 |
11.60 |
0.25 |
4.00 |
3.875 |
5.000 |
| 5 |
J55 |
13.00 |
0.253 |
4.494 |
4.369 |
5.563 |
| 5 |
K55 |
13.00 |
0.253 |
4.494 |
4.369 |
5.563 |
| 5 |
J55 |
15.00 |
0.296 |
4.408 |
4.283 |
5.563 |
| 5 |
K55 |
15.00 |
0.296 |
4.408 |
4.283 |
5.563 |
| 5 |
N80 |
15.00 |
0.296 |
4.408 |
4.283 |
5.563 |
| 5 |
L80 |
15.00 |
0.296 |
4.408 |
4.283 |
5.563 |
| 5 |
C95 |
15.00 |
0.296 |
4.408 |
4.283 |
5.563 |
| 5 |
P110 |
15.00 |
0.296 |
4.408 |
4.283 |
5.563 |
| 5 1/2 |
J55 |
14.00 |
0.244 |
5.012 |
4.887 |
6.050 |
| 5 1/2 |
K55 |
14.00 |
0.244 |
5.012 |
4.887 |
6.050 |
| 5 1/2 |
J55 |
17.00 |
0.304 |
4.892 |
4.767 |
6.050 |
| 5 1/2 |
K55 |
17.00 |
0.304 |
4.892 |
4.767 |
6.050 |
| 5 1/2 |
N80 |
17.00 |
0.304 |
4.892 |
4.767 |
6.050 |
| 5 1/2 |
L80 |
17.00 |
0.304 |
4.892 |
4.767 |
6.050 |
| 5 1/2 |
C95 |
17.00 |
0.304 |
4.892 |
4.767 |
6.050 |
| 5 1/2 |
P110 |
17.00 |
0.304 |
4.892 |
4.767 |
6.050 |
| 5 1/2 |
L80 |
20.00 |
0.361 |
4.778 |
4.653 |
6.050 |
| 5 1/2 |
N80 |
20.00 |
0.361 |
4.778 |
4.653 |
6.050 |
| 5 1/2 |
C95 |
20.00 |
0.361 |
4.778 |
4.653 |
6.050 |
| 5 1/2 |
P110 |
20.00 |
0.361 |
4.778 |
4.653 |
6.050 |
| 7 |
H40 |
17.00 |
0.231 |
6.538 |
6.413 |
7.656 |
| 7 |
J55 |
23.00 |
0.317 |
6.366 |
6.241 |
7.656 |
| 7 |
K55 |
23.00 |
0.317 |
6.366 |
6.241 |
7.656 |
| 7 |
N80 |
23.00 |
0.317 |
6.366 |
6.241 |
7.656 |
| 7 |
L80 |
23.00 |
0.317 |
6.366 |
6.241 |
7.656 |
| 7 |
C95 |
23.00 |
0.317 |
6.366 |
6.241 |
7.656 |
| 7 |
J55 |
26.00 |
0.326 |
6.276 |
6.151 |
7.656 |
| 7 |
N80 |
26.00 |
0.326 |
6.276 |
6.151 |
7.656 |
| 7 |
L80 |
26.00 |
0.326 |
6.276 |
6.151 |
7.656 |
| 7 |
C95 |
26.00 |
0.326 |
6.276 |
6.151 |
7.656 |
| 7 |
P110 |
26.00 |
0.326 |
6.276 |
6.151 |
7.656 |
| Casing O.D (in) |
Grade |
Nominal Weight (lb/ft) |
Casing Wall Thickness (in) |
Inner Diameter (in) |
Casing Drift Diameter (in) |
Thread Coupled O.D (in) |
| 9 5/8 |
J55 |
36.00 |
0.352 |
8.921 |
8.765 |
10.625 |
| 9 5/8 |
K55 |
36.00 |
0.352 |
8.921 |
8.765 |
10.625 |
| 9 5/8 |
J55 |
40.00 |
0.395 |
8.835 |
8.679 |
10.625 |
| 9 5/8 |
K55 |
40.00 |
0.395 |
8.835 |
8.679 |
10.625 |
| 9 5/8 |
N80 |
40.00 |
0.395 |
8.835 |
8.679 |
10.625 |
| 9 5/8 |
L80 |
40.00 |
0.395 |
8.835 |
8.679 |
10.625 |
| 9 5/8 |
C95 |
40.00 |
0.395 |
8.835 |
8.679 |
10.625 |
| 10 3/4 |
J55 |
40.50 |
0.350 |
10.050 |
9.894 |
11.750 |
| 10 3/4 |
K55 |
40.50 |
0.350 |
10.050 |
9.894 |
11.750 |
| 10 3/4 |
J55 |
45.50 |
0.400 |
9.950 |
9.794 |
11.750 |
| 10 3/4 |
K55 |
45.50 |
0.400 |
9.950 |
9.794 |
11.750 |
| 13 3/8 |
H40 |
48.00 |
0.330 |
12.715 |
12.559 |
14.375 |
| 13 3/8 |
J55 |
54.50 |
0.380 |
12.615 |
12.459 |
14.375 |
| 13 3/8 |
K55 |
54.50 |
0.380 |
12.615 |
12.459 |
14.375 |
| 13 3/8 |
J55 |
61.00 |
0.430 |
12.515 |
12.359 |
14.375 |
| 13 3/8 |
K55 |
61.00 |
0.430 |
12.515 |
12.359 |
14.375 |
| 16 |
J55 |
75.00 |
0.438 |
15.124 |
14.936 |
17.00 |
| 16 |
K55 |
75.00 |
0.438 |
15.124 |
14.936 |
17.00 |
| 16 |
J55 |
84.00 |
0.495 |
15.010 |
14.822 |
17.00 |
| 16 |
K55 |
84.00 |
0.495 |
15.010 |
14.822 |
17.00 |
| 18 5/8 |
H40 |
87.50 |
0.435 |
17.755 |
17.567 |
20.00 |
| 18 5/8 |
J55 |
87.50 |
0.435 |
17.755 |
17.567 |
20.00 |
| 18 5/8 |
K55 |
87.50 |
0.435 |
17.755 |
17.567 |
20.00 |
| 20 |
H40 |
94.00 |
0.438 |
19.124 |
18.936 |
21.00 |
| 20 |
J55 |
94.00 |
0.438 |
19.124 |
18.936 |
21.00 |
| 20 |
K55 |
94.00 |
0.438 |
19.124 |
18.936 |
21.00 |
| 20 |
J55 |
106.50 |
0.500 |
19.124 |
18.936 |
21.00 |
| 20 |
K55 |
106.50 |
0.500 |
19.124 |
18.936 |
21.00 |
| 20 |
J55 |
133.00 |
0.635 |
18.730 |
18.542 |
21.00 |
| 20 |
K55 |
133.00 |
0.635 |
18.730 |
18.542 |
21.00 |
Coupling and Thread Specifications of Well Casing (Buttress Thread)
Coupling power-tight make-up J (in) = 0.500, threads per inch = 5
| O.D. (in) |
O.D. D (in) |
Coupling O.D. W (in) |
Length NL (in) |
Recess Ø Q (in) |
Bearing Face Width b (in) |
Hand- Tight Standoff A |
Casing Weight (lb) |
| 4 1/2 |
4.500 |
5.000 |
8 7/8 |
4.640 |
1/8 |
1/2 |
10.12 |
| 5 |
5.000 |
5.563 |
9 1/8 |
5.140 |
5/32 |
1 |
13.00 |
| 5 1/2 |
5.500 |
6.050 |
9 1/4 |
5.640 |
5/32 |
1 |
14.15 |
| 7 |
7.000 |
7.656 |
10 |
7.140 |
7/32 |
1 |
23.24 |
| 9 5/8 |
9.625 |
10.625 |
10 5/8 |
9.675 |
3/8 |
1 |
51.05 |
| 10 3/4 |
10.750 |
11.750 |
10 5/8 |
10.890 |
3/8 |
1 |
56.74 |
| 13 3/8 |
13.375 |
14.375 |
10 5/8 |
13.515 |
3/8 |
1 |
70.03 |
| 16 |
16.000 |
17.000 |
10 5/8 |
16.154 |
3/8 |
7/8 |
88.81 |
| 18 5/8 |
18.625 |
20.000 |
10 5/8 |
18.779 |
3/8 |
7/8 |
138.18 |
| 20 |
20.000 |
21.000 |
10 5/8 |
20.154 |
3/8 |
7/8 |
110.45 |
Coupling and Thread Specifications of Well Casing (Round Thread)
Coupling power- tight make-up J (in) = 0.500, threads per inch = 8
| Casing OD (in) |
Coupling OD W (in) |
Length NL (in) |
Recess Ø Q (in) |
Recess depth q (in) |
Bearing Face Width b (in) |
Hand- Tight Standoff A |
Casing Weight (lb) |
| S |
L |
S |
L |
| 4 1/2 |
5.000 |
6 1/4 |
7 |
4 19/32 |
0.500 |
5/32 |
3 |
7.98 |
9.16 |
| 5 |
5.563 |
6 1/2 |
7 3/4 |
5 3/32 |
0.500 |
3/16 |
3 |
10.27 |
12.68 |
| 5 1/2 |
6.050 |
6 3/4 |
8 |
5 19/32 |
0.500 |
1/8 |
3 |
11.54 |
14.15 |
| 7 |
7.656 |
7 1/4 |
8 3/4 |
7 3/32 |
0.500 |
3/16 |
3 |
18.49 |
23.87 |
| 9 5/8 |
10.625 |
7 3/4 |
9 |
9 25/32 |
0.433 |
1/4 |
3 1/2 |
39.75 |
56.11 |
| 10 3/4 |
11.750 |
8 |
-- |
10 29/32 |
0.433 |
1/4 |
3 1/2 |
45.81 |
-- |
| 13 3/8 |
14.375 |
8 |
-- |
13 17/32 |
0.433 |
7/32 |
3 1/2 |
56.57 |
-- |
| 16 |
17.000 |
9 |
-- |
16 7/32 |
0.433 |
7/32 |
3 1/2 |
76.96 |
-- |
| 18 5/8 |
20.000 |
9 |
-- |
18 27/32 |
0.433 |
7/32 |
3 1/2 |
119.07 |
-- |
| 20 |
21.000 |
9 |
11 1/2 |
20 7/32 |
0.366 |
7/32 |
4 |
95.73 |
126.87 |