API Casing Couplings

Couplings are used to hold the neighboring joints together during axial tension or compression.The common oilfield API-5CT casing couplings include J55, K55, N80 and P110 in accordance with API 5CT/5B, can be classified as STC (short thread), LTC (long thread) BTC (buttress thread) and premium connections.

We cover a size from 4-1/2″ to 20″,STC, LTC and BTC, we also manufacture premium connections based on our customer enquiry.

 

STC Coupling

STC Coupling

API Casing Coupling Short Thread

We provide STC casing coulings from 4-1/2″ to 20″, in grade J55, K55, N80, L80 and P110.

The round-thread (STC or LTC) casing-joint strength is given as the lesser of the fracture strength of the pin and the jump-out strength. 

 

LTC Coupling

LTC Coupling

API Casing Coupling Long Thread

We provide LTC casing coulings from 4-1/2″ to 20″, in grade J55, K55, N80, L80 and P110.

The round-thread (STC or LTC) casing-joint strength is given as the lesser of the fracture strength of the pin and the jump-out strength. 

 

BTC Coupling

BTC Coupling

API Casing Coupling Buttress Thread

We provide BTC casing coulings from 4-1/2″ to 20″, in grade J55, K55, N80, L80 and P110.

The buttress thread casing joint strength is given as the lesser of the fracture strength of the pipe body (the pin) and the coupling (the box).  

Casing Couplings Size And Dimension

API Casing Couplings Short Thread
Coupling Size (inches)
Min Length (inches)
Weight per Coupling (lbs)
Palletized Carton Quantity
Palletized Carton Weight
 
4 1/2
6.250
7.98
408
3255
5
6.500
10.27
300
3164
5 1/2
6.750
11.53
276
3182
6 5/8
7.250
20.10
154
3095
7
7.250
18.50
170
3145
7 5/8
7.500
27.12
120
3254
8 5/8
7.750
35.78
108
3578
9 5/8
7.750
39.75
80
3180
10 3/4
8.000
45.81
72
3298
11 3/4
8.000
49.91
60
2994
13 3/8
8.000
56.56
54
3054
16
9.000
76.96
 –
 –
20
9.000
95.72
 –
API Casing Couplings Long Thread
Coupling Size (inches)
Min Length (inches)
Weight per Coupling (lbs)
Palletized Carton Quantity
Palletized Carton Weight
 
4 1/2
7.000
9.15
408
3733
5
7.750
12.68
300
3804
5 1/2
8.000
14.15
276
3905
6 5/8
8.750
25.00
154
3850
7
9.000

23.88

160
3820
7 5/8
9.250
34.46
110
3790
8 5/8
10.000
47.77
80
3822
9 5/8
10.500
56.11
68
3815
API Casing Couplings Buttress Thread
Coupling Size (inches)
Min Length (inches)
Weight per Coupling (lbs)
Palletized Carton Quantity
Palletized Carton Weight
 
4 1/2
8.875
10.03
380
3811
5
9.125
12.90
290
3741
5 1/2
9.250
14.02
276
3869
6 5/8
9.625
24.27
156
3786
7
10.000
23.15
164
3797
7 5/8
10.375
34.88
108
3767
8 5/8
10.625
45.99
85
3909
9 5/8
10.625
51.06
74
3778
10 3/4
10.625
56.75
65
3688
11 3/4
10.625
61.79
60
3707
13 3/8
10.625
70.04
54
3782

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