Well Casing

We provide buttress and round thread seamless casing pipes according to API 5CT. All pipes are produced in cooperation with one of the largest casing pipes manufacturers in China, thus ensuring low prices and above-standard quality.

Grades offered: J55, K55, N80, L80, C95, P110, H40. Well casing outer diameter ranging from 41/2" to 20".

Special FlushMax threading on request.

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
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