Casing coupling
API seamless casing coupling
Oil casing coupling
Size: 4-1/2"-20"
Standard: API 5CT & API 5B
Grade: J55, K55, L80, C90, C95, N80,T95, P110, Q125
Type: LTC, STC, BTC, XC, Premium connection
Packing: wooden case, wooden pallet, or by requirements of customers
Payment: L/C, T/T
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Oil Casing Coupling
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API Round-Thread Casing Coupling-Dimension, Tolerances and Masses
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Label 1
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Size
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Outside Diameter
mm
Wb,c
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Minimum Length mm
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Diameter of Recess
mm
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Width of bearing face
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Mass kg
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Grade
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Outside Diameter mm
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Short
NL
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Long
NL
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Short
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Long
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1
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2
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3
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4
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5
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6
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7
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8
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9
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J55 K55 L80 C90 C95 N80-1 N80-Q T95 P110 Q125
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4-1/2
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114.30
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127.00
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158.75
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177.80
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116.68
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3.97
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3.62
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4.15
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5
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127.00
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141.30
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165.10
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196.85
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126.38
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4.76
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4.66
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5.75
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5-1/2
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139.70
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153.67
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171.45
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203.20
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142.08
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3.18
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5.23
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6.42
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6-5/8
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168.28
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187.71
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184.15
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222.25
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170.66
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6.35
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9.12
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11.34
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7
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177.80
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194.46
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184.15
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228.60
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180.18
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4.76
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8.39
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10.83
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7-5/8
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193.70
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215.90
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190.50
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234.95
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197.64
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5.56
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12.30
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15.63
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8-5/8
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219.08
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244.48
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196.85
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254.00
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223.04
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6.35
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16.23
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21.67
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9-5/8
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244.48
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269.88
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196.85
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266.70
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248.44
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6.35
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18.03
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25.45
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10-3/4
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273.05
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298.45
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203.20
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-
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277.02
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6.35
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20.78
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-
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11-3/4
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298.45
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323.85
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203.20
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-
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302.42
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6.35
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22.64
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-
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13-3/8
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339.72
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365.12
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203.20
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-
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343.69
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5.56
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25.66
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-
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16
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406.40
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431.80
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228.60
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-
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411.96
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5.56
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34.61
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-
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18-5/8
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473.08
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508.00
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228.60
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-
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478.63
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5.56
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54.01
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-
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20
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508.00
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533.40
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228.60
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292.10
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513.56
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5.56
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43.42
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57.04
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API Buttress-Thread Casing Coupling-Dimension, tolerances and masses
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Label 1
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Size
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Outside Diameter
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Minimum Lenth NL mm
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Diameter of Recess
mm
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Width of bearing face
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Mass kg
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Grade
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Outside Diameter mm
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Regular Wb,c mm
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Special Clearance
Wc mm
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Regular
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Special Clearance
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4-1/2
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114.30
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127.00
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123.82
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225.42
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117.86
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3.18
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4.55
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3.48
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J55 K55 L80 C90 C95 N80-1 N80-Q T95 P110 Q125
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5
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127.00
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141.30
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136.52
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231.78
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130.56
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3.97
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5.85
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4.00
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5-1/2
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139.70
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153.67
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149.22
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234.95
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143.26
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3.97
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6.36
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4.47
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6-5/8
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168.28
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187.71
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177.80
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244.48
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171.83
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6.35
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11.01
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5.65
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7
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177.80
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194.46
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187.32
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254.00
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181.36
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5.56
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10.54
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6.28
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7-5/8
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193.68
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215.90
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206.38
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263.52
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197.23
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7.94
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15.82
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9.29
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8-5/8
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219.08
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244.48
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231.78
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269.88
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222.63
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9.52
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20.86
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10.80
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9-5/8
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244.48
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269.88
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257.18
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269.88
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248.03
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9.52
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23.16
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12.02
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10-3/4
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273.05
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298.45
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285.75
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269.88
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276.61
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9.52
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25.74
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13.39
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11-3/4
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298.45
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323.85
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-
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269.88
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302.01
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9.52
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28.03
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-
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13-3/8
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339.72
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365.12
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-
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269.88
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343.28
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9.52
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31.77
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-
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16
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406.40
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431.80
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-
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269.88
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410.31
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9.52
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40.28
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-
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18-5/8
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473.08
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508.00
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-
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269.88
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476.99
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9.52
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62.68
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-
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20
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508.00
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533.40
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-
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269.88
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511.91
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9.52
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50.10
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-
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a The size designation for the coupling is the same as the size designation for the pipe on which the coupling is used
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b Groups 1,2 and 3: Tolerance on outside diameter W+/-1% but not greater than +/-3.18mm
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c Group 4: Tolerance on outside diameter W+/-1% but not greater that mm
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d Groups 1,2 and 3: Tolerance on outsider diameter Wc, mm
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