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OCTG - Casing Couplings
Standard:API 5CT, API 5B
Steel Grade:J55,K55,N80,L80
Size Range:OD:76~180
Delivery Condition:API 5CT Specification
Surface Quality:API 5CT Specification
Delivery Time:30 days
Packing Style:Requirements of customers
Terms of Payment:T/T
Manufacturer Condition: In accordance with API 5CT Specification, high quality Seamless Pipe is used to manufacture couplings.

Types: Regular, Special Clearance, combination and reducing, EUE Teflon seal-rings and 20° special-bevel couplings, Changeover Couplings - Box x Box, 8 Rd x 10 Rd and LTC Buttress
Threads: According to API 5B, - Edition: Casing Threads: Short and long round, buttress, extreme line and USS Improved Buttress.

Casing Couplings API 8 Round Thread Dimension and Masses
Label
Outside
Diameter
D (inches)
Outside
Diameter
W (inches)
Length
Inches
Mass
Lb/Ft
Quantity
Per Carton
Quantity
Per Carto
n
Short
Long
Short
Long
Short
Long
4-1/2
4.500
5.000
6-1/4
7
7.98
9.16
294
294
196
5
5.000
5.563
6-1/2
7-3/4
10.27
12.66
252
210
196
5-1/2
5.500
6.050
6-3/4
8
11.54
14.15
216
180
136
6-5/8
6.625
7.390
7-1/4
8-3/4
20.11
25.01
120
92
100
7
7.000
7.656
7-1/4
9
18.49
23.87
120
100
84
7-5/8
7.625
8.500
7-1/2
9-1/4
27.11
34.46
80
64
64
8-5/8
8.625
9.625
7-3/4
10
35.79
47.77
60
60
52
9-5/8
9.625
10.625
7-3/4
10-1/2
39.75
56.11
50
36
40
10-3/4
10.750
11.750
8
10-1/2
45.81
62.02
45
36
45
11-3/4
11.750
12.750
8
10-1/2
49.91
67.39
40
40
40
13-3/8
13.375
14.375
8
10-1/2
56.57
76.63
25
20
25

Casing Couplings API Buttress Threads Dimension and Masses
Label
Outside
Diameter
D (inches)
Outside
Diameter
W (inches)
Outside Diam.
Special
Clearance
Minimum
Length
Inches
Mass Lb/Ft
Quantity
Per Carton
Regular
Special
Clearance
4-1/2
4.500
5.000
4.875
8-7/8
10.120
7.680
196
5
5.000
5.563
5.375
9-1/8
13.000
8.820
196
5-1/2
5.500
6.050
5.875
9-1/4
14.150
9.850
136
6-5/8
6.625
7.390
7.000
9-5/8
24.490
12.460
100
7
7.000
7.656
7.375
10
23.240
13.840
84
7-5/8
7.625
8.500
8.125
10-3/8
34.880
20.470
64
8-5/8
8.625
9.625
9.125
10-5/8
45.990
23.800
52
9-5/8
9.625
10.625
10.125
10-5/8
51.050
26.490
40
10-3/4
10.750
11.750
11.250
10-5/8
56.740
29.520
45
11-3/4
11.750
12.750
 
10-5/8
61.800
 
40
13-3/8
13.375
14.375
 
10-5/8
70.030
 
25

Note: All Buttress couplings are 5 threads per inch with 4-1/2 thru 13-3/8 taper tapped-3/4" per foot on diameter.
Both LTC and STC couplings are 8 threads per inch and taper tapped-3/4" per foot on diameter

Coupling Grades & Color Identification
Grade
Type
Entery Coupling
Band(s)
H40
 
None
Same as for pipe
J55 Tubing
 
Bright Green
None
J55 Casing
 
Bright Green
One White
K55
 
Bright Green
None
M65
 
M65 pipe uses L80 Type 1 couplings 
N80
1
Red
None
N80
Q
Red
Green
L80
1
Red
One Brown
L80
9 Cr
Red
Two Yellow
L80
13 Cr
Red
One yellow
C90
1
Purple
None
C90
2
Purple
One yellow
T95
1
Silver
None
T95
2
Silver
One yellow
C95
 
Brown
None
P110
 
White
None
Q125
1
Orange
None
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