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PRODUCTS & SERVICES
OCTG :
Casing | Tubing | Pup Joints | Tubing Couplings | Casing Couplings | Line Pipe
Precision Machining :
Tool Joints | Batch Production For Precision Machining Operations
Processing & Inspection Services :
TT Processing | Pipe Processing | Pipe Inspection | Inspection Services
OCTG - Casing Couplings
Manufacturer Condition: In accordance with API 5CT Specification, - 7th Edition, 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.
Couplings Process Control Chart
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 Carton
|
|
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
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6-1/2
|
7-3/4
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10.27
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12.66
|
252
|
210
|
196
|
|
5-1/2
|
5.500
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6.050
|
6-3/4
|
8
|
11.54
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14.15
|
216
|
180
|
136
|
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6-5/8
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6.625
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7.390
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7-1/4
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8-3/4
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20.11
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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
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9-1/4
|
27.11
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34.46
|
80
|
64
|
64
|
|
8-5/8
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8.625
|
9.625
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7-3/4
|
10
|
35.79
|
47.77
|
60
|
60
|
52
|
|
9-5/8
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9.625
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10.625
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7-3/4
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10-1/2
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39.75
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56.11
|
50
|
36
|
40
|
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10-3/4
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10.750
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11.750
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8
|
10-1/2
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45.81
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62.02
|
45
|
36
|
45
|
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11-3/4
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11.750
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12.750
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8
|
10-1/2
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49.91
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67.39
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40
|
40
|
40
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13-3/8
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13.375
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14.375
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8
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10-1/2
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56.57
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76.63
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25
|
20
|
25
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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
|
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Regular
|
Special
Clearance
|
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4-1/2
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4.500
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5.000
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4.875
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8-7/8
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10.120
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7.680
|
196
|
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5
|
5.000
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5.563
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5.375
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9-1/8
|
13.000
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8.820
|
196
|
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5-1/2
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5.500
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6.050
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5.875
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9-1/4
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14.150
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9.850
|
136
|
|
6-5/8
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6.625
|
7.390
|
7.000
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9-5/8
|
24.490
|
12.460
|
100
|
|
7
|
7.000
|
7.656
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7.375
|
10
|
23.240
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13.840
|
84
|
|
7-5/8
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7.625
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8.500
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8.125
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10-3/8
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34.880
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20.470
|
64
|
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8-5/8
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8.625
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9.625
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9.125
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10-5/8
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45.990
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23.800
|
52
|
|
9-5/8
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9.625
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10.625
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10.125
|
10-5/8
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51.050
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26.490
|
40
|
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10-3/4
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10.750
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11.750
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11.250
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10-5/8
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56.740
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29.520
|
45
|
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11-3/4
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11.750
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12.750
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10-5/8
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61.800
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40
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13-3/8
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13.375
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14.375
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10-5/8
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70.030
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25
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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
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Grade
|
Type
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Entery Coupling
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Band(s)
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H40
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None
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Same as for pipe
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J55 Tubing
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Bright Green
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None
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J55 Casing
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Bright Green
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One White
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K55
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Bright Green
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None
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M65
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M65 pipe uses L80 Type 1 couplings
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N80
|
1
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Red
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None
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N80
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Q
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Red
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Green
|
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L80
|
1
|
Red
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One Brown
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L80
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9 Cr
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Red
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Two Yellow
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L80
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13 Cr
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Red
|
One yellow
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C90
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1
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Purple
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None
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C90
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2
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Purple
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One yellow
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T95
|
1
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Silver
|
None
|
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T95
|
2
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Silver
|
One yellow
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C95
|
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Brown
|
None
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P110
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White
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None
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Q125
|
1
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Orange
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None
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